title
Sitkoh creek steelhead: 1993 escapement and harvest
author
Array ( [0] => Harding, R. J. D. Jones )
abstract
The escapement of adult steelhead Oncorhynchus mykiss to Sitkoh Creek in 1993 was counted at a weir located about 0.5 km upstream of the mouth of the creek. Five hundred and twenty fish were counted from April 10 to June 1; the mid-point of the immigration occurred on May 1, 1993. The 1993 escapement was 37% less than the mean weir counts of 1936, 1937, 1982, and 1990. All 520 steelhead were sexed, and 183 were randomly sampled for lengths and ages. Of the randomly subsampled fish, 64% were females which averaged 777 mm long (SE = 6.4 mm); males constituted 36% of the subsample and averaged 759 mm long (SE = 12.7 mm). The total escapement (520 steelhead) was composed of 63% female and 37% male. First-time spawners constituted 53% of the sampled escapement, repeat spawners constituted 45%, and 2% were unreadable. Fifty-eight percent of the nine complete age classes (i.e., freshwater age not regenerated) of repeat spawners were ages 3.2S1 (33%) and 4.2S1 (25%). Between May 11 and June 1, 1993 (when the weir was dismantled) a total of 332 steelhead kelts passed downstream through the Sitkoh Creek weir. An on-site creel survey estimated a total 342 angler-hours (SE = 82) to have been expended at Sitkoh Creek between April 19 and May 31; an estimated 84 steelhead (SE = 22) were caught and released (Sitkoh Creek was closed to harvest in 1993).
date
1994-10-01
organization
ADF&G Division of Sport Fish
species
Array ( [0] => steelhead )
file_path
https://grey-lit.s3.wasabisys.com/sitkoh-creek-steelhead-1993-escapement-and-harvest.pdf
thumb
https://grey-lit.s3.wasabisys.com/sitkoh-creek-steelhead-1993-escapement-and-harvest-pdf-2-792x1024.jpg
content
Fishery Data Series No. 94-36 Sitkoh Creek Steelhead: 1993 Escapement and Harvest bY Roger Harding and Doug Jones October 1994 Alaska Department of Fish and Game Division of Sport Fish FISHERY DATA SERIES NO. 94-36 SITKOH CREEK STEELHEAD: 1993 ESCAPEMENT AND HARVEST' bY Roger Harding and Doug Jones Alaska Department of Fish and Game Division of Sport Fish Anchorage, Alaska October 1994 1 This investigation was partially financed by the Federal Aid in Sport Fish Restoration Act (16 U.S.C. 777-777K) under Project F-10-8, Job No. R-l-4. The Fishery Data Series was established in 1987 for the publication of technically oriented results for a single project or group of closely related projects. Fishery Data Series reports are intended for fishery and other technical professionals. Distribution is to state and local publication distribution centers, libraries, individuals and, on request, to other libraries, agencies, and individuals. This publication has undergone editorial and peer review. The Alaska Department of Fish and Game administers all programs and activities free from discrimination on the basis of sex, color, race, religion, national origin, age, marital status, pregnancy, parenthood, or disability. For information on alternative formats available for this and other department publications, contact the department ADA Coordinator at (voice) 907-465-4120, or (TDD) 907-465-3646. Any person who believes s/he has been discriminated against should write to: ADF&G, P.O. Box 25526, Juneau, AK 99802-5526; or O.E.O., U.S Department of the Interior, Washington, DC 20240. TABLE OF CONTENTS Page LIST OF TABLES ........... LIST OF FIGURES ........... LIST OF APPENDICES ......... ABSTRACT .............. INTRODUCTION ............ METHODS ............... Escapement .......... ................. Harvest Study ......... ................. RESULTS ............... . . . . . . . . . . . . . . . . . 6 Escapement .......... Harvest Study ......... DISCUSSION ............. ACKNOWLEDGMENTS ........... LITERATURE CITED .......... APPENDIX A ............. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii ii ii 1 6 9 9 15 15 17 -i- LIST OF TABLES Table Page 1. Summary of weir and foot surveys for steelhead in Sitkoh Creek . . 4 2. Age composition, mean length, and sex of steelhead sampled at Sitkoh Creek,1993............................ 10 3. Summary of marks and scars observed on adult steelhead sampled at SitkohCreekweir,1993...................... 11 4. Steelhead catch rates (CPUE = [kept + released] c effort) in selected Alaska streams, 1982 through 1992 . . . . . . . . . . . . 14 LIST OF FIGURES Figure u 1. Map showing location of Sitkoh Creek, northern Southeast Alaska . . 3 2. Map showing location of weir at Sitkoh Creek, Chichagof Island, northern Southeast Alaska . . . . . . . . . . . . . . . . . . . . . 3 3. Escapement timing for steelhead at Sitkoh Creek weir, 1993 . . . . 7 4. Cumulative number of steelhead counted through the Sitkoh Creek weir in1993.......... ~ . . . ~ . . . . . . . . . . . . . . . 7 5. Percent age composition of first-time and repeat spawning steelhead in Sitkoh Creek, 1993 . . . . . . . . . . . . . . . . . . . . . . . 8 6. Cumulative number of male and female steelhead passed through Sitkoh Creekweirin1982,1990,and1993 . . . . . . . . . . . . . . . . 12 LIST OF APPENDICES Appendix Page Al. Daily and cumulative weir counts for upstream- and downstream- migrating adult steelhead at Sitkoh Creek, 1993 . . . . . . . . . . 19 A2. Length, age, and sex of the 520 adult steelhead sampled at Sitkoh Creekweir. . . . . . . . . . . . . . . . . . . . . . . . . . 21 A3. Freshwater age composition and length at age of downstream migrating steelhead smolt sampled at Sitkoh Creek, 1993 . . . . . . . . . . . 31 A4. Freshwater age composition and mean length, by sex, of steelhead smolt sampled at Sitkoh Creek, 1993 . ~ . . . . . . . . . . . . . . 31 A5. List of data files used to analyze data and prepare this report . . 32 -ii- ABSTRACT The escapement of adult steelhead Oncorhynchus mykiss to Sitkoh Creek in 1993 was counted at a weir located about 0.5 km upstream of the mouth of the creek. Five hundred and twenty fish were counted from April 10 to June 1; the mid-point of the immigration occurred on May 1, 1993. The 1993 escapement was 37% less than the mean weir counts of 1936, 1937, 1982, and 1990. All 520 steelhead were sexed, and 183 were randomly sampled for lengths and ages. Of the randomly subsampled fish, 64% were females which averaged 777 mmlong (SE = 6.4 mm); males constituted 36% of the subsample and averaged 759 mm long (SE = 12.7 mm). The total escapement (520 steelhead) was composed of 63% female and 37% male. First-time spawners constituted 53% of the sampled escapement, repeat spawners constituted 45%, and 2% were unreadable. Fifty-eight percent of the nine complete age classes (i.e., freshwater age not regenerated) of repeat spawners 'were ages 3.2Sl (33%) and 4.2Sl (25%). Between May 11 and June 1, 1993 (when the weir was dismantled) a total of 332 steelhead kelts passed downstream through the Sitkoh Creek weir. An on-site creel survey estimated a total 342 angler-hours (SE = 82) to have been expended at Sitkoh Creek between April 19 and May 31; an estimated 84 steelhead (SE = 22) were caught and released (Sitkoh Creek was closed to harvest in 1993). KEY WORDS: Sitkoh Creek, steelhead, Oncorhynchus mykiss, escapement, weir, creel survey, Sitka, Southeast Alaska, Chichagof Island, AWL, age- weight-length, rainbow trout, harvest. -l- INTRODUCTION Sitkoh Creek, on Chichagof Island in northern Southeast Alaska (Figures 1 and 2), has an average steelhead escapement of 824 (Table 1) and supports a popular steelhead sport fishery. Sitkoh Creek attracts steelhead anglers from all urban centers of northern Southeast Alaska, with most of them coming from Sitka (Jones 1983). Foot surveys of Sitkoh Creek escapement have been conducted annually since 1983 to index the number of adult steelhead in the Sitkoh system (Table 1). The average number of adult steelhead observed in reliable or "good quality" foot surveys (i.e., good light conditions, low water, and good visibility) is 74 (SD = 46). Because of relatively low counts obtained during foot surveys since 1988, weirs were used in 1990, and again in 1993, to determine if the population is deviating from past weir counts (Table 1). In 1936, 1937, 1982, and 1990, weirs were used to count the number of steelhead entering Sitkoh Creek during the spring. The resultant counts for those years were 760, 1108, 770, and 661 steelhead, respectively (Table 1). However, comparable foot surveys were not conducted during weir operations in 1990. A low-water event combined with the weir operation delayed the kelt outmigration, causing an erroneous count (A. E. Schmidt, Alaska Department of Fish and Game, Sitka, Alaska, personal communication). Thus, the weir count of steelhead entering Sitkoh Creek in 1993 provided an opportunity to correlate foot surveys with weir escapement counts. Six creel surveys have been conducted at Sitkoh Creek since 1976 (1976, 1978, 1982, 1987, 1990, and 1991). These surveys have indicated that most of the Sitkoh Creek steelhead fishery occurs in the lower sections of the creek, but some effort occurs at Sitkoh Lake, where a U.S. Forest Service (USFS) recreational cabin is located (Figure 2 ). Current plans call for periodic use of weir counts and creel surveys on the Karta River and on Sitkoh Creek to monitor steelhead escapement and provide a means to monitor the status of steelhead systems in Southeast Alaska. The research objectives for 1993 were (1) to count the escapement of steelhead into the Sitkoh Creek system between April 1 and May 31, 1993, and (2) to describe the distributions of length and age for adult steelhead returning to Sitkoh Creek between April 1 and May 31, 1993. METHODS Escapement Adult steelhead were caught in a trap as they passed upstream through an aluminum channel and picket weir erected 0.5 km above the mouth of Sitkoh Creek (Figure 2). Each steelhead caught was measured to the nearest 1 mm fork-length (tip of snout to fork of tail), and scales were removed for age analysis. Date, time of passage through the weir, sample number, sex (if possible), condition, and comments were also recorded. Eight scales were collected, four from each side of the fish, from an area two scale rows above the lateral line on a diagonal line from the posterior end of -2- 0 25 miles L..-- 0 25 km Figure 1. Location of Sitkoh Creek, northern Southeast Alaska. Figure 2. Location of weir at Sitkoh Creek, Chichagof Island, northern Southeast Alaska. -3- Table 1. Summary of weir and foot surveys for steelhead in Sitkoh Creek (Schmidt 1992). Year Weir count Count Foot survey Expanded Date Conditions estimatea 1936 1937 1973 1976 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 760 1,108 770 661 6 33 18 17 42 42 b -_ 143 92 115 58 107 17 20 NAC 40 40 mean 824 April 27 May 17-18 May 16 May 17 good 1,672 May 11 good 1,076 May 21 good 1,345 May 21 late count 678 May 20 good 1,251 May 24 high water 200 May 18 good 210 May 14 good 468 May 14 good 468 too early good 386 210 199 491 491 a Calculated from expansion factor determined during 1982 weir operation: foot counts were made during periods of known escapement. Foot counts averaged 8.55% of known escapement. b Stream count of 45 on May 18 when weir count was 520, and stream count of 58 on May 30 when weir count was 685. ' Foot counts are not comparable, as fish were holding above the weir (A. E. Schmidt, Alaska Department of Fish and Game, Sitka, personal communication). -4- the dorsal fin to the anterior end of the anal fin (Paget 1920). Scale samples were mounted on gum cards, and triacetate impressions of the scales (7,000 kg/cm2 pressure at a temperature of 97% for 30 seconds) were prepared for use in determining age. Water temperature (nearest 1%) and depth (nearest 0.5 cm) were measured 5 m downstream from the weir each morning. Steelhead scales were aged using methods described by Narvar and Withler (1977). Repeat spawners were classified with an "S" after the ocean age to denote successful spawning and survival. For example, a steelhead aged as 3.2Sl was 6 years old: it spent 3 years (winters) in fresh water before emigration as a smolt and 2 years (winters) in salt water, then returned to fresh water as an adult, spawned ("S"), and survived another year in salt water before returning to fresh water on its second spawning run. First-time spawning steelhead are fish without an "S" in their total age designation. The mean and standard errors for the lengths measured were calculated using standard procedures for normally distributed data (SAS 1985). Harvest Study Two surveys, an on-site creel survey and a postal survey, were used to estimate the angler effort and catch of steelhead by anglers on the Sitkoh Creek system in 1993. A stratified "direct expansion" creel survey based on randomized sampling of anglers completing their trips near the mouth of Sitkoh Creek was used to estimate angler effort and catch. April 19 was chosen as the creel survey starting day to best appropriate creel survey resources (i.e., man-hours) into the time period when fish and anglers were historically more abundant. The fishery was stratified into three biweekly periods (April 19 through May 2, May 3 through May 16, and May 17 through May 31) and into morning or afternoon periods, as catch and effort have been found to vary between early and late day (Jones et al. 1991). The survey thus has early/late days as primary units and anglers within days as secondary sampling units. When a primary unit ($4 day) was selected for sampling, the entire period was be to sampled. The day began at 0700 hours and ended at civil twilight (averaged over the biweekly period). During each biweekly period, four of fourteen early and seven of fourteen late periods were randomly selected for sampling; previous Sitkoh Creek creel surveys have shown that more anglers completed their trip during the afternoon, or late, period; thus more resources were allocated to the late period. The estimation of angler catch in stratum h was accomplished with the following formula. Estimation of angler effort used the same formula, with E substituted for C. cl = D,?, (1) (2) ?hi = Mhi chi (3) -5- YChij j=l Chi = ~ mhi (4) where chij is the catch by angler j in sampling day i stratum h, mhi is the number of anglers interviewed in day i, Mhi is the number of anglers completing trips in day i, d, is the number of days sampled in stratum h, and D, is the number of days in stratum h. The variance of the harvest by stratum is estimated: 2 ce,,-c,,2 Dh ,2M,i2 (l-f,hi) Y(c ..-chi)2 V[?,l = (l- flh) Dh2 i=l d, cd,-1) + 1=1 A=lrn h r'lrn (5) hl _ 1) hl where flh is the sampling fraction for days and fahi is the sampling fraction for anglers. Effort and catch estimates for seasonal strata were totalled to provide estimates for the entire season. The variance of the summed estimates is the sum of the variances. A postal survey was used to estimate angler effort and catch of steelhead trout by anglers using the USFS cabin at Sitkoh Lake between April 1 and June 15, 1993. Names of cabins were obtained from USFS cabin reservation lists. Methods and questionnaire for the postal survey are presented in Jones (in prep). RESULTS Escapement The weir was fish-tight on April 1, 1993. Five hundred and twenty (520) steelhead were counted upstream through the weir between April 10 and June 1, 1993, with the midpoint of the immigration occurring on May 1 (Figure 3 and Appendix Al). Three hundred and thirty-two (332) steelhead kelts were counted moving downstream through the weir after spawning (Appendix Al, Figure 4); however, fish were still emigrating when the weir was dismantled. The first fish passed downstream through the weir on May 11, and the midpoint of emigration occurred on May 20, when 114 fish were counted. Water temperatures in Sitkoh Creek ranged from 1.5OC on April 2 to 13.0°C on June 1, with temperatures consistently above z4.0°C after April 21. Water levels ranged from 44 cm on May 1 to a low of 16 cm on June 1 (Appendix Al). All 520 immigrant steelhead were sampled for sex (Appendix A2); 37% were males and 63% were females (Figure 5). Scales from 121 males and 181 females (302 total) were collected for age analysis. Four of the 302 scale samples (one from males and three from females) could not be aged, and freshwater age could not be determined for 84 of the remaining 298 (Appendix A2). Scale samples were collected from each immigrant between April 10 and April 24, every third fish between April 25 and May 6, and every other fish between May 7 and June 1. A subsample of 183 length and scale samples (118 female and 65 male) was selected to estimate the length and age composition of the Sitkoh Creek steelhead immigrants. The length and scale subsample was chosen to equally represent the -6- n 50% of Escapement 5 0 I+- 1 -Apr -L 8-Apr I\ rd J ++ 23-Apr I 16-Apr ++t 30-Apr 7-May 1CMay 21 -May 29-May Date Figure 3. Escapement timing for steelhead at Sitkoh Creek weir, 1993. 60 q ~~~~ -- ~~ !lso I 400 i Upstream 300- Downstream Figure 4. Cumulative number of steelhead counted through the Sitkoh Creek weir in 1993. -7- 5.2 3.2 32 T 2.2 1 t-- I 0 5 10 15 20 25 30 35 Percent 4.3Sl 4.2Sl Sl ii 2 0 4.2Sl & a 3.3Sl Sl 3.3Sl 3.2Sl Sl 0 5 10 15 20 25 30 35 Percent Figure 5. Percent age composition of first-time (above) and repeat (below) spawning steelhead in Sitkoh Creek, 1993. Only completely determined age classes are shown. -8- immigration and was selected as follows: every third fish between April 10 and April 24; every fish between April 25 and May 7; and four out of six fish between May 8 and June 1. Fifty-three percent (53%) of the immigrants were first-time spawners; of the fully readable scales (i.e., not regenerated) from first-time spawners, 32% were age 3.2, 31% were age 3.3, 18% were age 4.2, 15% were age 4.3, 1% were age 2.2, and 1% were age 5.2. The freshwater portion of the scales was regenerated (R) on 27% of first-time spawners (23% R.3 and 4% R.2) and 31% of repeat spawners (Table 2, Figure 5). Forty-five percent (45%) of the immigrants were repeat spawners and represented nine different age classes. Ages 3.2Sl and 4.2Sl accounted for 58% of the non-regenerated scales of repeat spawners; 3.3Sl and 4.3Sl accounted for 21%. First-time and repeat spawning females (n = 118) averaged 777 mm fork length (SE = 6.4 mm); males (n = 65) averaged 759 mm fork - length (SE = 12.7 mm) (Table 2). Adult steelhead returning to Sitkoh Creek were examined at the weir for fresh or healed scars and wounds. These wounds were classified into seven categories (Table 3) based on descriptions and pictures presented in the Division of Commercial Fisheries Field Operations Manual (ADF&G Unpublished). Fifty-one percent (51%) of the 520 fish examined at the weir were classified as having some type of wound (Table 3). Ninety-two fish (35% of the freshly injured or scarred fish and 16% of all fish) were classified as Category A. Category A scars are widely believed to be caused by an encounter with a gill net. The origin of scars in other categories is unknown, but they are believed to have been caused by fish, sea mammals, or other fishing activity. Harvest Study The on-site creel study was conducted with three biweekly periods as planned, between April 19 and May 31. Forty-six (46) anglers completed fishing trips during scheduled creel periods, and all but one were interviewed. An estimated 342 (SE = 81.6) angler-hours were spent to catch and release an estimated 84 (SE = 22.0) steelhead; no harvest was observed, as Sitkoh Creek was closed to harvest by Emergency Order (EO) in 1993. Results from the postal creel survey are presented in Jones (In prep). DISCUSSION The 1993 steelhead escapement to Sitkoh Creek was 63% of historic weir counts (Table 1) and down 25% and 21%, respectively, from the most recent counts in 1982 and 1990. During a visual count of Sitkoh Creek on May 14, 1993, biologists observed 8-9% of the known number of steelhead in Sitkoh Creek (A. E. Schmidt, Alaska Department of Fish and Game, Sitka, personal communication). This compares closely to the correlation of visual and float counts at Sitkoh Creek in 1982, when 8.6% of the known number of steelhead were observed (Table 1). Overall, the 1993 steelhead escapement into Sitkoh Creek appears similar to that in 1990 (Figure 6). The magnitude and timing of male immigrants were similar to those in both 1990 and 1982. The magnitude and timing of female steelhead immigration were nearly identical to those in 1990, until April 28, when the -9- Table 2. Age composition, mean length, and sex of steelhead sampled at Sitkoh Creek, 1993. Age class Female Male Comb. % of grand Length n SE Length n SE n total First-time spawners 2.2 3.2 683 10 27.6 3.3 756 16 10.8 4.2 684 5 34.4 4.3 779 9 11.0 5.2 730 1 R.2a 615 2 35.0 R.3a 773 15 9.1 650 1 1 0.6 638 13 15.9 23 12.6 814 6 18.8 22 12.0 664 8 18.2 13 7.1 814 2 71.5 11 6.0 1 0.6 650 2 5.0 4 2.2 816 7 20.0 22 12.0 Subtotal 740 58 8.9 712 39 15.5 97 53.0 Repeat spawners 3.2Sl 3.2SlSl 3.3Sl 3.3SlSl 4.2Sl 4.2SlSl 4.3Sl 4.3SlSl 5.3Sl R.2Sla R.2S1Sla R.3Sla 774 11 11.8 817 8 21.1 19 10.4 837 2 46.5 910 2 85.5 4 2.2 855 4 19.2 840 1 5 2.7 840 3 20.0 3 1.6 824 8 13.7 815 6 18.8 14 7.7 880 1 850 1 2 1.1 812 6 14.7 805 1 7 3.8 850 1 1 0.6 828 2 10.0 2 1.1 787 9 18.4 824 4 52.3 13 7.1 810 3 55.1 790 1 4 2.2 851 7 8.7 853 2 17.5 9 4.9 Subtotal 815 57 6.6 828 26 12.6 83 45.4 Unreadable 780 3 28.4 3 1.6 GRAND TOTAL 777 118 6.4 759 65 12.7 183 100.0 a R = Scales regenerated; freshwater age undetermined. -lO- Table 3. Summary of marks and scars observed on adult steelhead sampled at Sitkoh Creek weir, 1993. categorya and status n % of scarred fish % of sampled escapementb A fresh 2 0.8 0.4 A healed 77 29.2 14, a B healed 7 2.7 1.4 C fresh 1 0.4 0.2 D healed 1 0.4 0.2 E fresh 5 1.9 1.0 F fresh 2 0.8 0.4 F healed 69 26.1 13.3 G healed 75 28.4 14.4 Fish with 2 scars D fresh / A healed 2 0.8 0.4 E fresh / A healed 1 0.4 0.2 E healed / A healed 1 0.4 0.2 F fresh / A healed 1 0.4 0.2 F healed / A healed 6 2.3 1.2 F healed / E healed 1 0.4 0.2 G healed / A healed 3 1.1 0.6 G healed / B healed 1 0.4 0.2 G healed / E fresh 1 0.4 0.2 G healed / F fresh 1 0.4 0.2 G healed / F healed 4 1.5 0.8 Fish with 3 scars B fresh 6 healed / E fresh A healed/ E fresh/ G healed A healed/ F healed/G healed Total number scarred fish 1 0.4 0.1 1 0.4 0.2 1 0.4 0.2 264 100.0 51.0 a Category A: One or more fairly well delineated linear marks between the head and the dorsal fins, approximately perpendicular to the longitudinal body axis and encircling or partially encircling the body. Probably caused by gill net (Dave Gaudet, Alaska Dept. of Fish and Game, Juneau, personal communication). Category B: A series of approximately parallel mark or scrape lines over a substantial portion of the body; two or more series of such marks occurring at different angles may give the appearance of crosshatching marks. Category C: A fairly well delineated scrape band generally occurring between the head and the dorsal fin, approximately perpendicular to the longitudinal body axis or angled slightly backward from top to bottom of body and containing a nearly oval-shaped open wound, normally in the upper portion of the body. Category D: Extensive descaling of at least 25% or more of one or both sides of the body but with no delineated marks or wounds. Category E: Open, gaping wounds or puncture marks located anywhere on the body either with no marks and scrapes or with adjacent irregular "scratch" or "claw" marks, but no marks as described above in categories A-D. Category F: Scars/marks not fitting the descriptions in any other category. Category G: A fresh or healed appearing wound on either side of the body; usually a couple of inches in length, and angled dorsally and forward toward the head of the fish, from the anterior insertion of the dorsal fin to the front of the anal fin and behind the ventral fin. May also occur elsewhere on the fish, but angle of cut is usually consistent with ones described above. The fresh wound will have flesh exposed the whole length of cut. The healed scar will have an "indentation" or "pucker" type scar wherever it is located. b Total sampled escapement = 520. -ll- z .-~,~,~,~++~,~~+~,~, -r-j, +---- 31 -Mar 07-Apr 14-Apr 21 -Apr 28-Apr O&May 12-May 1 O-May 26-May Date 450 T 400 50 0 31 -Mar 07-Apr 14-Apr 21 -Apr 28-Apr 05-May 12-May 1 g-May 26-May Date Figure 6. Cumulative number of male (Top) and female (bottom) steelhead passed through Sitkoh Creek weir in 1982, 1990, and 1993. -12- number of female immigrants dropped off; in 1983 the strongest female immigration occurred after May 5 (Figure 5). Estimated angler effort expended at Sitkoh Creek has decreasedby 72% since 1990, and by 60% since 1991 (Table 4). The stream was closed by EO to harvest of steelhead in 1992 and 1993. Sitkoh Creek continues to have one of the highest catch rates in Southeast Alaska (Table 4). The catch rate (CPUE) for Sitkoh Creek steelhead in 1993 (0.24 steelhead/hour) was very similar to that of 1990 (0.23 steelhead/hour), but down from the 1991 rate of 0.36 steelhead/hour. The EO prohibiting harvest of steelhead at Sitkoh Creek in 1993 may have contributed to the decrease in total estimated angler effort. A feasibility study was conducted at Sitkoh Creek in 1993 to (1) assess the movement of sport-caught steelhead from lower river holding areas-where the vast majority of effort occurs-through the weir; and (2) to develop techniques for a future catch-and-release study. While no quantitative data were generated from this study, several observations were made. Eighteen steelhead were caught with standard sport fishing gear in the lower river holding area, tagged by a variety of methods, and released; nine of these passed through the weir from 1 to 10 days (average of 5.5 days) later. The other nine steelhead may have died or lost their tags and passed unobserved upstream, the secondary mark (upper caudal punch) overlooked, or left the system and entered another steelhead system in Sitkoh Bay. During the feasibility study at Sitkoh Creek several steelhead were captured multiple times with sport fishing gear. One steelhead was recaptured 1 day later approximately 80 m upstream of its release site; another was recaptured 3 days later 80 m upstream. Another was caught three times; the second capture occurred 10 days later in the exact location, and the third capture only 3 hours after the second, and 40 m downstream. The steelhead caught three times was reported to have fought equally as hard all three times and was passed upstream through the weir 11 hours after being caught and released the third time. Several different tags and tagging methods were tried, to determine which methodology would work best in future catch-and-release studies. The preferred tag was a single $14 barbed hook with a unique color pattern (yarn) attached to the hook. The hook was inserted through the posterior base (peduncle) of the dorsal fin while the fish was being held in a landing net. If the number of fish to be tagged were large, the color pattern could be replaced with a uniquely numbered tag. The entire capture and tagging procedure could be accomplished by one person with this methodology, but for this study a two-person effort was preferred. In the 1993 study, technicians collected genetic samples from steelhead smolt and resident rainbow trout in Sitkoh Creek. A graduate student will compare Sitkoh Creek genetic samples with samples from fish in other streams (C. L. Imboden, Alaska Department of Fish and Game, Douglas, Alaska, personal communication). A summary of length and age of juvenile steelhead sampled for baseline genetic data is presented in Appendix A3 and A4. -13- Table 4. Steelhead catch rates (CPUE = [kept + released] + effort) Alaska streams, 1982 through 1992. Year Location Effort Kept Released CPUE 19872 Anchor 29,079 1989 Situk 10,434 1986C Situk 12,283 19a7d Situk 10,542 19aae Situk 16,379 1989' Situk 10,988 19909 Situk 14,907 1991h Situk 4,618 19aaj Thorne 2,331 1990k Thorne 3,070 19aal Ward 3,638 1989m Ward 4,778 1989" Karta 1,568 1992s Karta 1,939 19890 Peterson 2,121 199op Peterson 2,865 19909 Sitkoh 1,205 1991r Sitkoh a48 1993 Sitkoh 342 Steelhead 375 667 0.04 362 2,695 0.29 287 2,094 0.19 391 3,797 0.40 423 4,991 0.33 361 2,055 0.22 392 1,317 0.11 NA1 1,055 0.23 67 93 0.07 111 142 0.08 359 971 0.37 384 293 0.14 50 124 0.11 la 196 0.11 22 17 0.02 ia 16 0.01 35 243 0.23 19 297 0.36 NA a4 0.24 in selected Ratio released to kept 1.8 7.4 7.3 9.7 11.8 5.7 3.4 NA 1.4 1.3 2.7 0.8 2.5 10.9 0.8 0.9 6.9 15.6 NA a Wallis and Balland (1984). b Mecum and Suchanek (1986). Survey missed the early part of the run. Informal surveys indicated at least 2,230 hours of effort expended to harvest 66 steel- head and release another 1,889 steelhead between 4/15 and 4/29 (Bob Johnson, Alaska Dept. of Fish and Game, Yakutat, personal communication). ' Mecum and Suchanek (1987). d Bingham et al. (1988). e Suchanek and Bingham (1989). f Johnson and Marshall (1990). s Bob Johnson, Alaska Dept. of Fish and Game, Yakutat (personal communication). h Glynn (1992). Survey is for peak of season only (April 8-June 2). i Harvest of steelhead prohibited by emergency order. j Freeman and Hoffman (1990); September 26, 1988 through June 4, 1989. k Freeman and Hoffman (1991); October 23, 1989 through June 3, 1990. ' Hubartt (1989); February 29, 1988 through June 19, 1988. m Hubartt (1990); October 10, 1988 through May 21, 1989. n Hoffman et al. (1990). ' Harding and Jones (1990). P Harding and Jones (1991). q Jones et al. (1991). r Schmidt (1992). ' Harding and Jones (1993). -14- ACKNOWLEDGMENTS We thank Brad Gruening, Robert Harley, and Dan Peroni for their outstanding work in the field and for their insights into the information we collected. Kurt Kondzela aged the steelhead scales and provided logistical support. Dan Peroni was instrumental in performing the catch-and-release feasibility study. LITERATURE CITED ADF&G (Alaska Department of Fish and Game). Unpublished. 1990 field operational manual for sampling chinook and coho salmon harvested in the Southeast Alaska troll fishery for incidence of gear marked and scarred fish. Located at: Alaska Department of Fish and Game, Division of Commercial Fisheries, Juneau. Bingham, A. E., P. M. Suchanek, S. Sonnichsen, and R. D. Mecum. 1988. Harvest estimates for selected sport fisheries in Southeast Alaska in 1987. Alaska Department of Fish and Game, Fishery Data Series No. 72, Juneau. Freeman, G. M. and S. H. Hoffman. 1990. Steelhead Oncorhynchus mykiss creel census and recreation survey on the Thorne River, Southeast Alaska, 1988-89. Alaska Department of Fish and Game, Fishery Data Series No. 90-34, Anchorage. 1991. Thorne River steelhead creel census and recreation survey, Southeast Alaska, 1989-90. Alaska Department of Fish and Game, Fishery Data Series No. 91-30, Anchorage. Glynn, B. 1992. Situk River steelhead and chinook salmon creel surveys and weir, 1991. Alaska Department of Fish and Game, Fishery Data Series No. 92- 47, Anchorage. Harding, R. and D. Jones. 1990. Peterson Creek and Lake system evaluation, 1989. Alaska Department of Fish and Game, Fishery Data Series No. 90-37, Anchorage. -. 1991. Peterson Creek and Lake system evaluation, 1990. Alaska Department of Fish and Game, Fishery Data Series No. 91-31, Anchorage. . 1993. Karta River Steelhead: 1992 escapement and creel survey studies. Alaska Department of Fish and Game, Fishery Data Series No. 93-30, Anchorage. Hoffman, S. H., J. Koerner, and D. Magnus. 1990. Steelhead creel and escape- ment statistics, in-river distribution, and recreational use survey, Karta River, Southeast Alaska, 1989. Alaska Department of Fish and Game, Fishery Data Series No. 90-45, Anchorage. Hubartt, D. 1989. Ward Creek steelhead creel survey, Ketchikan, Alaska, 1988. Alaska Department of Fish and Game, Fishery Data Series No. 119, Anchorage. -. 1990. Ward Creek steelhead creel survey, Ketchikan, Alaska, 1989. Alaska Department of Fish and Game, Fishery Data Series No. 90-40, Anchorage. -15- LITERATURE CITED (Continued) Johnson, R. E. and R. P. Marshall. 1990. Harvest estimates for selected sport fisheries in Yakutat, Alaska, in 1989. Alaska Department of Fish and Game, Fishery Data Series No. 90-36, Anchorage. Jones, D. E. 1983. A study of cutthroat-steelhead in Alaska. Alaska Department of Fish and Game. Anadromous Fish Studies, Completion Report, 1983. Project AFS-42, 25 (AFS-42-11) 73-87. Jones, J. D. In prep. Southeast Alaska recreational cabin survey for 1992. Alaska Department of Fish and Game, Anchorage. Jones, J. D., R. Harding, and A. Schmidt. 1991. Sitkoh Creek steelhead study, 1990. Alaska Department of Fish and Game, Fishery Data Series No. 91, Anchorage. Mecum, R. D. and P. M. Suchanek. 1986. Southeast Alaska sport harvest estimates. Alaska Department of Fish and Game, Federal Aid in Fish Restoration, Annual Performance Report 1985-1986, Project F-10-1, Volume 27 (S-l-l), Juneau. 1987. Harvest estimates of selected sport fisheries in Southeast Alaska. Alaska Department of Fish and Game, Fishery Data Series No. 21, Anchorage. Narvar, R. A. and F. C. Withler. 1977. Age and size of steelhead trout, Salmo gairdneri, in angler catches from Vancouver Island, British Columbia, streams. Fisheries Research Board of Canada. Circular 91:1-26. Paget, G. W. 1920. Report on the scales of some teleostean fish with special reference to their method of growth. Great Britain Ministry of Agriculture, Fisheries and Food. Fishery Investigations Series 2, Volume 4, No. 3. London. SAS. 1985. SAS User's Guide: Basics, Version 5 edition. Statistical Analysis System, Incorporated, Cary, North Carolina. Schmidt, A. E. 1992. Sitkoh Creek steelhead study, 1991. Alaska Department of Fish and Game, Fishery Data Series No. 92-31, Anchorage. Suchanek, P. M. and A. E. Bingham. 1989. Harvest estimates for selected sport fisheries in Southeast Alaska in 1988. Alaska Department of Fish and Game, Fishery Data Series No. 114, Juneau. Wallis, J. and D. T. Balland. 1984. Anchor River Steelhead Study. Alaska Department of Fish and Game, Federal Aid in Sport Fish Restoration, Annual Report of Progress, 1982-1983, Volume 24 (AFS-48-3), Juneau. -16- APPENDIX A -17- -18- Appendix Al. Daily and cumulative weir counts for upstream- and downstream- migrating adult steelhead at Sitkoh Creek, 1993. Upstream Downstream Daily water Date F M Daily Cum. Daily Cum. Temp Depth 1-Apr 0 2-Apr 0 3-Apr 0 4-Apr 0 5-Apr 0 6-Apr 0 7-Apr 0 8-Apr 0 9-Apr 0 lo-Apr 2 ll-Apr 1 12-Apr 0 13-Apr 1 14-Apr 5 15-Apr 0 16-Apr 1 17-Apr 3 18-Apr 5 19-Apr 11 20-Apr 5 21-Apr 8 22-Apr 2 23-Apr 13 24-Apr 9 25-Apr 22 26-Apr 19 27-Apr 1 28-Apr 10 29-Apr 1 30-Apr 1 l-May 15 2-May 6 3-May 4 4-May 18 5-May 10 6-May 13 7-May 0 0 0 0 0 0 0 0 0 0 1 2 0 2 5 3 3 4 5 14 5 10 1 5 8 18 18 1 9 0 0 11 2 2 6 5 5 1 3 0 0 0 0 0 0 0 0 0 3 3 0 3 10 3 4 7 10 25 10 18 3 18 17 40 37 2 19 1 1 26 8 6 24 15 18 1 14 0 0 0 0 0 0 0 0 0 3 6 6 9 19 22 26 33 43 68 78 96 99 117 134 174 211 213 232 233 234 260 268 274 298 313 331 332 346 -continued- 0 0 2.0 20 0 0 2.0 25 0 0 1.5 22 0 0 2.0 21 0 0 2.0 23 0 0 2.0 22 0 0 2.2 21 0 0 3.0 34 0 0 3.0 32 0 0 3.0 34 0 0 3.0 34 0 0 3.0 34 0 0 3.0 45 0 0 3.0 34 0 0 3.0 35 0 0 3.0 40 0 0 3.0 40 0 0 3.0 36 0 0 3.5 35 0 0 3.0 35 0 0 4.0 35 0 0 4.0 34 0 0 5.0 36 0 0 4.0 36 0 0 4.5 36 0 0 5.0 35 0 0 5.5 36 0 0 5.0 42 0 0 5.0 39 0 0 5.0 36 0 0 5.0 44 0 0 5.0 37 0 0 5.0 33 0 0 5.5 29 0 0 5.0 40 0 0 6.0 38 0 0 5.0 34 0 0 6.0 29 8-May 11 -19- Appendix Al. (Page 2 of 2). Upstream Downstream Daily water Date F M Daily CUIII. Daily CUlll. Temp Depth g-May 10 5 15 361 0 0 6.0 29 lo-May 16 7 23 384 0 0 6.0 25 ll-May 2 2 4 388 1 1 6.5 24 12-May 7 3 10 398 0 1 5.5 22 13-May 13 2 15 413 54 55 6.0 21 14-May 3 3 6 419 0 0 7.0 25 15-May 9 2 11 430 2 57 8.0 29 16-May 19 1 20 450 1 58 10.0 31 17-May 8 2 10 460 0 58 9.0 38 18-May 6 1 7 467 0 58 9.5 31 19-May 8 2 10 477 0 58 10.0 28 20-May 1 0 1 478 114 172 12.0 29 21-May 7 1 8 486 8 180 10.5 34 22-May 1 4 5 491 6 186 12.0 31 23-May 3 1 4 495 2 188 11.0 28 24-May 1 0 1 496 0 188 11.0 24 25-May 3 2 5 501 26 214 11.5 24 26-May 3 1 4 505 46 260 11.0 21.5 27-May 0 0 0 505 0 260 11.5 20 28-May 2 1 3 508 11 271 11.0 19 29-May 3 2 5 513 31 302 11.0 18 30-May 3 1 4 517 0 302 13.0 17 31-May 2 0 2 519 27 329 13.0 20 1-Jun 0 1 1 520 3 332 13.0 16 -2o- Appendix A2. Length, age, and sex of the 520 adult steelhead sampled at Sitkoh Creek Weir, 1993. DATE LENGTH AGE SEX COMMENTSa 4/10/93 a70 4/10/93 a50 4/10/93 730 4/11/93 a50 4/11/93 975 4/11/93 a50 4/13/93 655 4/13/93 870 4/13/93 784 4/14/93 780 4/14/93 a40 4/14/93 860 4/14/93 834 4/14/93 700 4/14/93 670 4/14/93 770 4/14/93 a20 4/14/93 780 4/14/93 JO5 4/15/93 640 4/15/93 JO5 4/15/93 a30 4/16/93 670 4/16/93 758 4/16/93 a80 4/16/93 755 4/17/93 870 4/17/93 812 4/17/93 630 4/17/93 710 4/17/93 690 4/17/93 830 4/17/93 865 4118193 995 4/18/93 a90 4118193 620 4118193 650 4118193 590 4/18/93 840 4/18/93 a05 4118193 a00 4118193 795 4118193 a75 4/19/93 836 4/19/93 870 4/19/93 750 4/19/93 800 4/19/93 600 4/19/93 720 4/19/93 760 4/19/93 690 4/19/93 770 4/19/93 690 4.3Sl R.3 4.251 3.2Sl 3.3SlSlSl 3.251 3.2 3.3 4.3Sl 3.2Sl 3.2Sl R.ZSlSl 4.351 3.2 R.2 4.3 3.3SlSl 4.2 4.2 4.2 R.2 4.2Sl R.2 R.2Sl 3.3 R.3 3.3 3.3 4.2 4.3 3.2 4.3 3.2Sl 3.2SlSl R.BSlSl R.2 2.2 3.2 3.3 3.2 3.3SlSl 3.2 4.2Sl 4.3Sl 4.3 R.3 3.3 3.2 R.3 3.3 3.2 4.3Sl 4.2 F M F M F M M M F F M M F M M F F F M M M M M M M F F M M F M F M M F M M M M F F F F F M M F M F F M F M NR,B,lH,6H NR,SB,lH B,NR,lH SB,R,lH R,B,lH, FRESH NOSE BITE FROM OTTER 5F 7 SCALES B,NR (ONLY SEVEN SCALES) SB,NR,SPLIT TAIL, SEAL BITE SD,R,lH B,NR,7H NR,B,6H, PHOTO SB,NR SD.R B,NR SB,R,lH. PHOTO R,B,6H, 2 PHOTOS NR,B,NS R,SB,NS B,NR,6H B.R.NS B,R,NS B,R,TAIL SCAR JH SD,NR, BELLY SCAR 6H B,R,NS SB,NR,6H, PHOTO SB,R,lH PHOTO B,NR,6H PHOTO NR,B,6H PHOTO SB,NR,lH, PHOTO B,R,NS B,NR,NS R,B,lH PHOTO B,NR,lH, PHOTO B,R,NS SD,NR,NS B,NR,lH SB,NR,lH B,NR,NS SB,R,lH SB,NR,lH, TWO PHOTOS, TRR B,NR,lH B,NR,lH B,R,lH,SH, TWO PHOTOS B,NR,lH,TRR, PHOTO B,NR,HOOK IN MOUTH,PART OF CAUDAL BASE. DR,R,NS B,R,7H B,NR,NS B,R,NS B,NR,lH B,NR, JH,TRR B.R.NS B.NR, JH, PHOTO-#4 B,R,7H, PHOTO-#5 -continued- -21- Appendix A2. (Page 2 of 10). DATE LENGTH AGE SEX COMMENTSa 4/19/93 644 4/19/93 772 4/19/93 a94 4/19/93 778 4/19/93 678 4/19/93 655 4/19/93 765 4/19/93 635 4/19/93 940 4/19/93 758 4/19/93 640 4/x9/93 650 4/19/93 750 4/19/93 710 4/20/93 a40 4/20/93 a20 4/20/93 785 4/20/93 a25 4/20/93 a00 4/20/93 930 4/20/93 729 4/20/93 790 4/20/93 a75 4/20/93 a75 4/21/93 a80 4/21/93 a20 4/21/93 720 4/21/93 725 4/21/93 660 4/21/93 670 4/21/93 aa0 4/21/93 a40 4/21/93 760 4/21/93 750 4/21/93 720 4/21/93 785 4/21/93 625 4/21/93 590 4/21/93 640 4/21/93 a24 4/21/93 788 4/21/93 715 4/22/93 790 4/22/93 a95 4/22/93 740 4/23/93 742 4/23/93 670 4/23/93 757 4/23/93 a28 4/23/93 860 4/23/93 725 4/23/93 790 4/23/93 800 4/23/93 a70 3.3 4.2Sl 4.3 3.251 4.2 4.2 3.3 4.2 4.2SlSl 3.2Sl 5.2 4.2 R.3 4.2Sl 4.3 3.35151 R.2 R.3 4.3Sl 4.2SlSl 3.3 3.2 3.351 3.2Sl 3.3SlSl R.3 4.2 3.2Sl 3.2 4.2 R.2Sl R.3Sl 5.251 R.3 R.2 4.2SlSl 3.2 4.2 4.2 3.2SlSl R.2Sl 4.2Sl R.2SlSl R.3Sl 3.3 4.3 4.2 3.2Sl 3.3 R.ZSlSl 3.3 4.3 4.3 3.3 F M M F M M F M M F M F M F M F F M F M M M F F F M M M M M F F M F F F M F M M M F M F F M M F M F F F F F F B,R,7H SB,R,NS SB,R,lH, PHOTO #9 B,NR,7H B,R,lH,7H,? PHOTO $110 B,R,lH B,R,7H SB,R,lH D,R,5F, 2 SCALES MISSING PHOTO /ill B,NR, 1H FAINT B,NR,PAN JET EASY TO SEE, SHRIMP TAG 204 FELL OUT B,NR,NS D,R,lH FAINT B,NR,bH D,R,bH, PHOTO SD,R,NS B,NR,5F,2F,2H, TRR, PHOTO D,R,lH B,NR,bH SD,NR,7H,TRR, PHOTO #lb 6 #17 D,R,TRR SD,NR,7H SB,NR,~H, PHOTO +/la B,NR,lH PHOTO 19 6 20 B,NR,lH FAINT D,R,lH BOTH SIDES FAINT SB,R,7H D,R,PH BOTH SIDES FAINT B,R,7H BOTH SIDES SB,R,lH TORN DORSAL, UPPER CAUDAL MISSING SD,R,lH,7H, DRIPPING EGGS B,NR,lH,7H FAINT D,R,2H BOTH SIDES, CROSS HATCHING SB,NR,7H FAINT B,NR,bH B,R,7H FISH NOT SEXED B,R,NS B,R.NS SD,R,lH,7H SB,R,bH D,NR,7H,2H B,NR,NS SD,R,7H PHOTO B,NR,NS,TRR SB,NR,lH,TRR, TWO PHOTOS SD,R,NS D,R,lH,TRR, PHOTO SD,R,7H,TRR, PHOTO SD,R,bH SB,NR,7H,lH, TWO PHOTOS SB,NR,7H,PHOTO #31 SB,R,lH FAINT B,NR,lH bF 4/23/93 810 3.351 NR.NS -continued- -22- Appendix A2. (Page 3 of 10). DATE LENGTH AGE SEX COMMENTSa 4/23/93 4/23/93 4/23/93 4/23/¶3 4/23/¶3 4/23/93 4/23/93 4/23/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/24/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 830 R.3Sl 615 4.2 850 4.2SlSl 820 3.2Sl a55 R.2Sl 818 5.351 850 R.2SlSl 700 4.2Sl 840 4.2Sl 900 3.3 745 R.3 795 3.3 820 4.3Sl 659 3.2 745 3.2Sl 780 5.2Sl 732 3.3 615 3.2 660 3.2 820 4.3 820 3.2Sl 780 3.3 587 4.2 818 R.3 675 3.3Sl 652 3.2Sl 730 3.2Sl 870 R.3 605 3.2 850 R.2Sl 818 4.2Sl 868 3.3Sl 836 5.351 730 4.251 810 3.3 035 R.2Sl 630 3.2 700 R.3 800 R.3 670 3.2 780 830 760 735 R.3 4.3 R.2SlSl 3.3 F F M F M F F F M M M F F M F F F M M F F F M M F F M M F M F F F M F M M F M M M M F M F F F F F F F M M F F SB,NR,NS B,R,6H,TRR SD,R.NS SB,R, HALF OF ANAL FIN MISSING SD,R,6H SB,R,NS B,NR,6H B,R,NS SD.R,6H,7H SD,R,NS SD,R,NS SD,NR,NS B,NR,NS SB,R,NS SB,NR,7H, PHOTO B.R.NS B,NR,NS B,R,2H, PHOTO B,NR,NS B,NR,6H B,NR,7H, PHOTO SB,NR,lH B,R,6H, PHOTO SD,R,7H, PHOTO B,NR,lH B,NR,6H B,NR,2H SB,R,6H B,NR,NS SD,B,NS ?????? B,NR,NS B,NR,NS B,R,7H SD,R,6H B,NR,7H SB,R,7H SB,R,NS B,NR,NS SB,R,lH,ONLY 4 SCALES PER FISH FROM NOW ON SB, SAMPLING EVERY THIRD FISH FROM NOW ON SB, PASS B,R,NS B,NS SD,R,NS SB,R,lH, PHOTO, SPLIT DORSAL FIN SB,R,NS SB,NR,NS B,NR,NS B,NR,NS SD,R,NS B,NR,2H,JH, SPLIT,TORN DORSAL B,R SD,R B,NR,6H -continued- -23- Appendix A2. (Page 4 of 10). DATE LENGTH AGE SEX COMMENTSa 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/25/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/26/93 4/27/93 4/27/93 4/20/93 4/20/93 4/28/93 4128193 4/28/93 810 795 875 810 820 835 645 645 840 655 725 870 900 650 805 760 665 810 4.3Sl 3.2Sl 3.251 R.3 REGENS 4.2Sl R.2 R.2Sl 3.351 R.2 REGENS R.3Sl 3.3Sl R.2 4.3Sl 4.3 4.2 3.251 M F F F F M F M M M F F M F M M F F F M F F F M F M M M M F M F F M M M M F M F F M F M M F F F M M F F M M F SD.R B.NR,NS B,R SB,NR SB,NR,lH B,NR B,NR SD,R,NS SD,R B,m SD,R,lH, PHOTO B,NR SB,R SB,NR, MISSING LOWER CAUDAL B,NR B.R SB,NR,NS B,fJR SB,R SB,R,NS B,NR B,NR SB,R,6H B,NR B,R SB.NR, JH SB,R B,R B,NR, MISSING 3/4 OF DORSAL FIN B,NR SD,NR SD,NR,lF,TRR, PHOTO B,NR SB,NR SD,R SD,R SD,NR SD,R,6H SD,NR SB,NR B,NR SD,NR SB,NR SB,NR, JH SD,NR SD,NR B,NR B,NR SD,R SD,R, JH B,R B,NR SD,R, JH SD,R -continued- -24- Appendix A2. (Page 5 of 10). DATE LENGTH AGE SEX COMMENTSa 4/20/93 4/28/¶3 4/28/93 4/28/93 4/26/93 4/26/93 4/26/93 4/26/93 4/20/93 4/28/¶3 4/20/93 4/28/93 4/28/93 4/29/93 4/30/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/l/93 5/2/93 5/2/93 5/2/93 5/2/93 5/2/93 5/2/93 5/2/93 5/2/93 5/3/93 5/3/93 5/3/93 5/3/93 5/3/93 835 R.3Sl 740 3.251 580 3.2 795 4.2Sl 750 3.2 795 3.3 835 R.3Sl 883 3.2SlSl 770 3.3 765 4.351 790 3.2SlSl 750 R.2Sl 840 3.3Sl 740 R.2Sl 780 3.2Sl 688 4.2 830 710 R.2Sl 3.2Sl F F F F M M M M M M F F F F F F M M M M F F F M F M M F F M F F F F M M F F F F M M F F F M F F F M F F M F F B,NR B,R B,NR B,NR,lH, HOOK MARK ON SIDE B.R SD,NR B,R,lH,bH SD,R SD.R SD,R,bH SD,R B,NR SB,NR,bH SB,NR B,NR B,NR,NS SD,R,TRR D,R SB.R,bH. PHOTO B,R,NS B,NR,NS SB,R,bF, PHOTO SD,NR,NS SD,R,NS B,NR,lH,7H SD,NR,NS SD,R,7H B,NR B,NR,lH, PHOTO SD,R,lH B,NR,NS B,NR,NS SD.R.bH B,NR,bH SD,R,lH SD,R,NS SB,NR,NS SB,NR,lH B.NR.NS B,NR,NS B,R,NS SB,R,NS SD,NR,bH B,NR,JH, PHOTO 6 B,NR,lH, PHOTO 7 SB,R,bH, PHOTO 8 HOOK INJURY, TORN GILL PLATE B,NR,NS B,NR.NS B,NR,5F, PHOTO 9 SD,R,NS B,NR,lH, SPLIT TAIL B,NR,7H B,R,NS B.NR.bH 5/3/93 780 R.3 B,NR,bH -continued- -25- I Appendix A2. (Page 6 of 10). DATE LENGTH AGE SEX COMMENTSa 5/4/93 5/4/93 5/4/¶3 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/4/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/5/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/b/93 5/6/93 5/b/93 5/b/93 5/b/93 F M 615 3.2 M M F 760 R.ZSl F F M 661 4.2 F M M 760 3.3 F F F 805 4.3 F F F 820 3.3SlSl F F F 810 R.3Sl F F F 790 4.3 F F F 835 4.2Sl M M F 730 4.2 M F F 770 4.2Sl F F F 820 3.251 M F F 880 R.3 M M M 740 3.3 F F F 810 R.3 F F F 840 3.3 M F F 795 REGENS F F M 750 3.2 F F B,NR,lH SB,NR 1H. TORN DORSAL B,R,NS SB,R, TORN DORSAL SB,NR,6H B,NR,bH B.NR,NS SD,R,NS B,NR,bH SD,R,NS SD,R,7H B,NR,NS B,NR,lH SB,NR,NS B,NR,7H B,NR,NS B,NR,7H, TAIL NOTCHED SD,R,7H SB,R,NS SD,NR,NS B,NR,3F SB.NR.NS SB,R,NS B,NR,NS B,NR,bH ON TAIL B,NR,NS SD,R,bH SD,R,NS B,R,6H,lH B,R,6H B,NR,6H SB,NR,6H,7H B,NR,7H B,NR,7H B,NR,6H SD,R,7H, SPLIT DORSAL SD,NR,bF,lH B,NR,lH, TORN GILL PLATE SB,NR,NS B,NR,6H SD,R,NS B,R,lH B,NR,7H B,NR,NS B,R,NS B,NR,bH SB,NR,lH SD,NR,lH SD,NR,4H B,NR,6H B,NR,NS SB,NR,6H SD,R,lH B,R,bH -continued- -26- Appendix A2. (Page 7 of 10). DATE LENGTH AGE SEX COMMENTSa 5/6/93 5/6/93 5/J/93 5/8/93 5/a/93 5/a/93 5/a/93 5/8/93 5/8/93 5/8/93 5/8/93 5/8/93 5/a/93 5/6/93 5/8/93 5/8/93 5/8/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/9/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 5/10/93 850 R. 351 857 4.2Sl 800 3.3 755 3.3 795 R.3 750 4.2 875 3.x1 840 4.251 860 R.3Sl 875 R.3Sl 650 3.3 875 4.3 560 4.2 640 3.2 785 780 680 R.3 R.2Sl 625 3.2 650 4.2 770 R.ZSl 710 R.ZSl 630 4.2 785 3.3 670 R.3 788 R.3 660 872 4.2 4.2Sl F M M F F M F F F M F F F F F M F F F F M F F F F M F M F M M F F M F M M F M F F F M F F F F F F F F M M F F B,NR,lH,7H B,R,NS, DID NOT MEASURE SB,R, JH SB,NR,4F,lH, DESCALING SB,NR,lH SD,NR,NS SD,NR,7H SD.NR.lH.6H B,R,6H, PHOTO B,NR,6H B,NR,7H B,NR, JH SD.NR.7H B,NR,6H SB,NR, JH SD,R,6H SB,NR, JH B,R,7H B,NR,6H B,NR,JH, HOOK IN RIGHT PEC. SB,R.NS B,R,NS SB,NR,NS B,NR,lH B,R,NS D,R,7H, RED AND YELLOW TAG SB,NR,7H SB,R,NS SB,NR,NS SB,R,NS SB.R,JH, RED AND BLACK TAG B,NR. DORSAL FIN GONE SB,R,lH, CAUGHT IN HOOP NET FROM DN. STREAM. HAD BARBED FLY IN SD,R,NS B,R,NS SB,R,NS SB,R,NS B,NR,NS SD,R,NS SB,R,lH SB,NR,NS SB,NR,lH SD,R,NS SB,NR,6H SB,R,NS SB,NR,NS SB,R,NS SB,NR,lH SB,NR,6H SB,NR,NS B,NR,NS B,R,NS SB,R,NS SD,NR,7H -continued- -27- Appendix A2. (Page 8 of 10). DATE LENGTH AGE SEX COMMENTSa 5/11/93 5/11/93 5/11/93 5/11/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/12/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/m/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/13/93 5/14/93 5/14/93 5/14/93 5/14/93 5/14/93 5/14/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/15/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 855 560 780 820 700 820 845 630 700 640 565 750 790 880 870 755 885 760 670 660 620 670 850 770 795 750 765 R.3Sl 3.2 R.3 R.3 3.3 4.2 R.3 4.2 4.2 4.2 3.2 R.2SlSl 4.2Sl 4.2SlSl 3.3Sl REGENS 4.3 3.2 4.2 4.2 4.2 3.2 4.3SlSl R.3 R.2Sl 3.2 4.3 F F M M F F M F F M F F M F M F F F M F F F F F F F F F F M M F i-4 F F F M F F M F F F F F F F F F F F F F F F B,NR,bH B,NR,lH SD,R,NS SD,R,NS B,R,NS B,NR,NS D,R,5F SB,NR,NS SB,R,4F,lH SD,R,5F B,R,NS SB,NR,lH SD,R,7H B,NR,lH SD,R,NS B,NR,bH,lH SB,R,bH,5H SB,NR,bH SD,R.NS SB,R,lH B,NR,NS SB,NR,lF, PHOTO 13 SB,NR,NS SB,NR,7H SB,R,7H SB,NR,NS SB,R,lH B,NR,NS SB,R,lH,bH,7H SD,R,NS, YELLOW TAG D,R,lH,5F,7H, RED GRAY TAG B,NR,NS D,R,NS B,R,NS B,R,6H SD,NR,NS SD,NR,NS B,NR,7H B,NR,TIH SD,R,NS B,NR,NS B,NR,NS B,R,NS B,NR,6H SD,R, TORN DORSAL SD,R,NS SD,NR,7H SB,NR,NS SD,R,bH, RED-BLACK STREAMER SB,NR,NS SB,R,7H SB.R.7H SB,NR,lH,7H B,NR,lH 5/16/93 710 R.3 B.NR,lH -continued- -28- Appendix A2. (Page 9 of 10). DATE LENGTH AGE SEX COMMENTSa I 5/16/¶3 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/16/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5/17/93 5118193 5118193 5118193 5/18/93 5118193 5/18/93 5riai93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/19/93 5/20/93 5/21/93 5/21/93 5/21/93 5/21/93 5/21/93 5/21/93 5/21/93 5/21/93 5/22/93 5/22/93 5/22/93 5/22/93 5/22/93 5/23/93 5/23/93 630 3.2 590 3.2 730 5.2 775 R.3 695 R.2Sl 690 4.2 790 Il.3 710 3.3 650 4.2 a50 3.251 560 3.2 a25 4.3 760 3.251 a30 R.3 a75 R.3Sl 580 R.2 630 3.2 795 R.3 750 4.3 750 3.3 760 3.3 700 al5 a80 770 730 790 R.3 4.3 R.2SlSl 3.3 R.3 4.2Sl F B,NR,lH F B,R,NS F B,NR,NS F B,R,NS F B,R,NS F B,NR,6H F B,NR,6H F B,NR,lH F SB,NR,6H,JH F B,R,lH,6H M SB,NR,6H M SD,R,lH F B,R,NS F SB,R,NS F SB.R.NS F B,NR,lH F SB,NR,NS F B,R,NS F SB.NR.6H M SD,R,NS,TRR F SD,R,NS M SB,R,NS F SB,R,NS F SB,R,NS F SB,R,6H F B,R,NS F B,R, JH F B,NR,NS F B,R,NS F B,NR,6H, JH F SD,NR,NS F B,R,NS F B,NR,NS M SD.R,7H F SD,R,6H F B,R,NS M SD,R,2H F B,R,NS F B,R,lH F SB,R,lH,TRR, FISH DIED, SPLIT DORSAL F B,R,2H F B,R,7H M SB,R,NS F B,R,NS F B,NR,NS F B,NR,6H F B,NR,lH M D.R,NS M SD,R,NS M SB,R,NS M SD,R,6H F B,R,NS F B,R,6F,7H F SB,R,NS 5/23/93 M SD,R,6H -continued- -29- Appendix A2. (Page 10 of 10) DATE LENGTH AGE SEX COMMENTSa 5/23/93 5/24/93 5/25/93 5/25/93 5/25/93 5/25/93 5/25/93 5/26/93 5/26/93 5/26/93 5/26/93 5/28/93 5128193 5128193 5/29/93 5/29/93 5/29/93 5/29/93 5/29/93 5/30/93 5/30/93 5/30/93 5/30/93 5/31/93 5/31/93 770 685 780 610 930 600 920 780 a50 780 a00 610 720 3.3 R.2 R.3 3.2 R.2Sl 3.2 R.2SlSI 4.3 3.3 R.3 4.3 3.2 4.3 F F F M F F M F M F F F F M F M M F F F F F M F F M B,R,NS B,NR,lH B,NR,7H SD,R,TIH SB.R,NS B,NR,NS SD,R,NS B,R,7H SD,NR,NS SB,R,lH B,R,NS B,R,NS SB,NR,bH SD,R,PH B,NR,NS D,R,5F,7H SD,R,5F B,R,NS B,NR,lH B,R,lH B,NR,TIH B,R,NS B,R,NS B,NR,NS SB,R,7H b/1/93 SD,NR,NS, SPLIT TAIL a Key to abbreviations: B = bright; SB = semi-bright; D = dark; SD = semi-dark; R = ripe; NR = not ripe; NS = no scars; TRR = resuscitation required before release; F = fresh scar; H = healed scar; Photo = photograph taken; Numbers l-7 = scar category A-G (l=A, 2=B, etc.); -3o- Appendix A3. Freshwater age composition and length at age of downstream migrating steelhead smelt sampled at Sitkoh Creek, 1993. Freshwater Mean length Min. length Max. length age (mm> SD (mm> (mm> n % 3 161.5 11.1 145 180 13 16 4 187.7 15.1 160 220 43 54 5 217.8 14.5 190 245 16 20 6 240.0 21.2 225 255 2 2 ?" 203.3 31.4 160 235 6 8 Overall 191.9 24.8 160 310 80 a Regenerated, ages undetermined Appendix A4. Freshwater age composition and mean length, by sex, of steelhead smolt sampled at Sitkoh Creek, 1993. Female Male Combined Freshwater age Mean Mean length n SD length n SD n 3 163.2 6 12.3 160 4 183.5 23 12.1 192 5 218.3 12 14.0 216 6 225.0 1 255 ?" 190.0 3 39.7 216 0 7 10.8. 13 6 5 20 16.9 43 3 4 18.0 16 0 1 2 7 3 18.9 2 Overall 191.4 45 24.0 192.6 35 26.1 80 a Regenerated, ages undetermined -31- Appendix A5. List of data files used to analyze data and prepare this report.a Data file Description SIT93AWL.DBF Steelhead length, age, sex, and date and time of upstream passage through weir. SIT93DWN.DBF Downstream kelt counts, including date, time, and water level and temperature. SIT93JUV.DBF Juvenile and adult rainbow/steelhead captured and genetically sampled; includes date,length, and sex. SIT93WAT.DBF Daily water temperature, level, and weather observations. SIT93WER.DBF Upstream steelhead counts by sex; includes those fish passed through weir but not measured. SITSUM.SAS SAS code written to sum and analysis project data. a Data files have been archived at, and are available from, the Alaska Department of Fish and Game, Division of Sport Fish, Research and Technical Services, 333 Raspberry Road, Anchorage, Alaska 99518-1599. -32- TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURES LIST OF APPENDICES ABSTRACT INTRODUCTION METHODS RESULTS DISCUSSION ACKNOWLEDGMENTS LITERATURE CITED APPENDIX A
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