Mark-recapture experiments conducted during the summer of 1993 were used to estimate abundance of Arctic char Salvelinus alpinus near the Agulowak and Agulukpak rivers within the Wood River lake system, Alaska. Estimated abundance of char at the Agulowak River was 5,441 fish (95% CI 4,993 to 5,950). This is substantially less than the estimated historic average of over 11,700 fish. Abundance estimates at the Agulukpak River ranged between 4,011 and 7,118 char, which brackets the estimated
Mark-recapture and catch sampling experiments were conducted to estimate the abundance, survival rates and recruitment to lake trout Salvelinus namaycush populations in Paxson Lake in the Copper River drainage, and Lake Louise and Susitna Lake in the Susitna River drainage. Maximum sustainable yields and carrying capacities of populations in Paxson Lake, Lake Louise and Susitna Lake were estimated with thermal habitat volume (THV) measurements: the average volume of water between 8# and 12#C
Coho salmon Oncorhynchus kisutch marked as juveniles with coded wire tags and adipose finclips in 1991 and 1992 were released into several freshwater systems of Northern Cook Inlet. Marked coho salmon were recovered in 1993 from commercial fisheries and escapements. Escapement samples were used to assess straying and the proportion of marked fish returning to each system. Commercial harvest data and recoveries of marked fish from the commercial harvest were used to estimate the harvest
A mark-recapture experiment was used to estimate abundance of cutthroat trout Oncorhynchus clarki in Wilson Lake near Ketchikan, Alaska, in 1993. Abundance of cutthroat trout 180 millimeters fork length was 7,314 (standard error 807). Fish were captured with hook and line and large baited minnow traps. Fish caught with hook and line averaged 264 millimeters fork length; the largest was 535 millimeters. Fish caught in large baited minnow traps averaged 270 millimeters fork length; the largest
A lack of quantifiable information concerning the magnitude of coho salmon Oncorhynchus kisutch returns to the Kenai River precludes defining exploitation rates or other key management objectives for this species. To determine the feasibility of estimating coho salmon abundance in the Kenai River using sonar, we evaluated a potential sonar site at river mile (rm) 14. Hydroacoustic sampling was conducted to measure background noise levels and radio telemetry was used to estimate the lateral
During the period 3 July to 16 August 1993, abundance, composition, and selected fishery statistics were estimated for Dolly Varden Salvelinus malma (Walbaum) on the Anchor River. A total of 8,262 Dolly Varden were counted through a weir located 1.5 km upstream from salt water on the Anchor River. This Dolly Varden immigration is the lowest total adult return documented since this study was begun in 1987, however, the spawner component of this return increased slightly from the previous year
Since 1977, the Alaska Department of Fish and Game has conducted an annual mail survey to estimate sport fishing participation and harvests (fish kept) statewide and by Alaska fisheries, areas, regions, and species. Since 1990, catches (fish harvested plus fish released) have also been estimated. Detailed findings are presented for 1993. In 1993, 426,514 anglers took 1,809,419 household trips and fished 2,559,408 days to catch 6,307,062 fish and harvest 2,989,720 fish
Creel surveys were conducted on two of the major fisheries within the Tanana River drainage, Alaska, during 1993. These fisheries included the Salcha River chinook salmon Oncorhynchus tshawytscha fishery and the Chatanika River whitefish spear fishery. Angler effort, harvest and the distribution of harvest of whitefish by angler trip, and angler demographic composition were estimated for the Chatanika River whitefish spear fishery. Angler demographic composition along with effort, catch
Author:McPherson, S. A., D. R. Bernard S. T. Elliott
Organization:ADF&G Division of Sport Fish
Species (Common Name):Coho Salmon
As part of an ongoing study of the production of coho salmon Oncorhynchus kisutch from Taku River, near Juneau, Alaska, the Division of Sport Fish implanted coded wire tags in smolt leaving the river in spring 1992. Subsequent recovery of these fish was used to estimate the harvest, production, exploitation rate in 1993, and abundance of smolt in 1992. In 1992 two 12' diameter rotary smolt traps were fished at Barrel Point, Taku River, and caught 7,234 coho salmon smolt from 11 May to 12 June
The proportion of Arctic grayling > 270 millimeters fork length that emigrate from Caribou Creek after spawning to the Richardson Clearwater River, and are subsequently harvested the following year in the spring fishery in the Tanana River at Shaw Creek, was estimated for 1980 - 1988. On average, 67% of the population in the Richardson Clearwater River was comprised of Arctic grayling from Caribou Creek during the same year. On average, 48% of the pre-spawning aggregation of Arctic grayling
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