2 edition of Abundance, composition, and emigration of Arctic grayling in the Goodpaster River, 1995-1997 found in the catalog.
Abundance, composition, and emigration of Arctic grayling in the Goodpaster River, 1995-1997
William P. Ridder
by Alaska Dept. of Fish and Game, Division of Sport Fish in Anchorage, Alaska
Written in English
Mark-recapture experiments were conducted in the Goodpaster River over a six day period soon after ice-out in early May of 1995 1997 to estimate abundance, composition, and post-spawning emigration of Arctic grayling, Thymallus arcticus. Study area encompassed the lower 70 miles in 1995 and the lower 33 miles in 1996 and 1997. Over the three years, 8,025 Arctic grayling were captured. Estimated abundance of Arctic grayling 230 mm FL in 1995 was 23,194 fish (SE = 3,257) in the 70 mile reach and 13,445 fish (SE = 1,445) in the 33 mile reach. Estimated abundance in 1996 was 25,364 fish (SE = 3,093) 150 mm FL and 12,893 fish 230 mm FL (SE = 1,839) in 1997. In all years, quality-sized and larger fish (270 mm FL) predominated as did the 1990 year class. Age 6 and older fish comprised the majority of yearly age compositions. Relative contribution rates based on tag recoveries of these fish the following July in the Delta Clearwater River ranged from 22% (SE 5%) to 34% (SE 6%) in three length groups over the three years of estimates.
|Other titles||Federal aid in sport fish restoration (Alaska)|
|Statement||by William P. Ridder.|
|Series||Fishery data series -- no. 98-36.|
|Contributions||Alaska. Division of Sport Fish.|
|The Physical Object|
|Pagination||iii, 64 p. :|
|Number of Pages||64|
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ABSTRACT The abundance, size and age composition of Arctic grayling in the lower 23 km of the Delta Clearwater River was estimated using a two-sample mark-recapture experiment. A stock assessment of the Goodpaster River Arctic grayling fishery was completed during using mark- recapture experiments.
Objectives of the study were to estimate abundance and length and. estimate the abundance of Arctic grayling and mm FL in the Delta River study area (17 km) during Julysuch that the estimates were within 25% of the actual abundance 95% of the.
The abundance and length composition of Arctic grayling Thymallus arcticus in a km study area (sampling Areas A, B, and C) of the Upper Goodpaster 1995-1997 book (GPR) was estimated as part of a. 28 Figure Rainbow trout (> 6") estimates in the Pine Butte section of the Madison River,faU estimates.
e - - 1 Figure Consequently, Arctic ecosystems are unstable in terms of species composition and abundance, but nevertheless have shown substantial resilience to natural variability in the Holocene, largely because of the wide distributions and mobility of their constituent organisms.
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Resident fishes (e.g., rainbow trout, Dolly Varden, Arctic grayling) and juvenile salmon of species that rear for extended periods in streams (i.e., coho and Chinook) derive clear and substantial nutritional benefits through the consumption of salmon eggs and flesh and other food sources related to spawning salmon (Bilby et al.
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