Evaluation of Short-term Handling and Tagging Mortality of Cutthroat Trout at Florence Lake, Southeast Alaska, 1998 PDF Download
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Author: Roger Dean Harding
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 12
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Book Description
Author: Roger Dean Harding
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 12
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 36
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Book Description
![Mortality Studies on Cutthroat Trout in Yellowstone Lake [by] Orville P. Ball and Oliver B. Cope PDF](https://books.google.com/books/content/images/frontcover/0sOoKdKZYH8C?fife=w80-h100)
Author: Orville P. Ball
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 72
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Book Description
In a study of the Yellowstone Lake cutthroat trout, Salmo clarki lewisi, by the U.S. Fish and Wildlife Service, effects of environment on mortality of eggs, immature fish, spawners, and postspawners were measured for various components of the population in Yellowstone Lake (Wyoming). Five methods for estimating mortality of adults on spawning runs are described, with counting and tagging as the principal procedures. Of the total number of eggs deposited in the gravel, 60 to 75 percent died before hatching, and 99.6 percent had died by the time the fingerlings enetered Yellowstone Lake. In Arnica Creek runs, 48.6 percent died in the stream, 40.2 died later in the lake of natural causes, 7.6 were taken by fishermen, and 3.6 percent were alive 2 years later. The white pelican is a serious predator on cutthroat trout in Yellowstone Lake. From 1949 to 1953 fishermen caught 11.6 percent of the catchable trout available to them. Migrations of adult fish in Yellowstone Lake were traced through tagging.
Author: Roger Dean Harding
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 22
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Author: Roger Dean Harding
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 30
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Book Description
Report of a mark-recapture experiment to estimate abundance of cutthroat trout (Oncorhynchus clarki) in Florence Lake on Admiralty Island in southeastern Alaska near Juneau in 1991.
Author: Randolph P. Ericksen
Publisher:
ISBN:
Category : Coastal cutthroat trout
Languages : en
Pages : 58
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Author: Matthew Birch Foster
Publisher:
ISBN:
Category : Coastal cutthroat trout
Languages : en
Pages : 252
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Book Description
The resident coastal cutthroat trout Oncorhynchus clarki clarki population in Florence Lake, Southeast Alaska was sampled from July through October, 1997 to assess its maturity, fecundity, growth and sustained yield. Maturing female cutthroat have significant gonad development between mid September and late October. A gonadosomatic index threshold was established for female cutthroat trout. A logistic model for maturity estimated asymptotic percentages by age and length: 92% and 100% for males and 86% and 80% for females, indicating presence of skip spawning. Male cutthroat trout matured earlier and at smaller length than females, but females matured more rapidly. An allometric model fitted fecundity data well. Schnute's growth model indicated that growth was relatively slow. An ll-inch (279 mm) minimum size limit allows a high proportion of trout at Florence Lake to spawn at least once. Age-based and length-based per recruit analyses performed comparably and established sustainable fishing mortality estimates.
Author: Peter D. Bangs
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 15
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Book Description
This document reports on the results of a two-event mark-recapture study which was conducted at Florence Lake in 2003 to estimate the abundance and length composition of cutthroat trout, Oncorhynchus clarki.
Author: Gregg Edwin Rosenkranz
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 23
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Book Description
Author: Peter D. Bangs
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 22
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Book Description
A two-event mark-recapture study was conducted during 2002 at Florence Lake in Southeast Alaska to estimate the abundance and length composition of coastal cutthroat trout Oncorhynchus clarki clarki. Fish were captured with hook and line gear and hoop traps, marked with t-bar anchor tags, and given a dye mark as a secondary mark. The pooled Petersen estimate of abundance of cutthroat trout =180 mm FL was 13,515 fish (SE = 1,010; 95% CI = 11,534 - 15,495). Most of the cutthroat trout =180 mm FL were estimated to be =300 mm FL ( = 0.987, SE = 0.054). A much smaller proportion were 301-360 mm FL ( = 0.02, SE = 0.006), and very few fish were =360 mm FL ( = 0.005, SE = 0.002). Although the Petersen estimate was biased, abundance estimates and length composition of large and small fish were relatively similar to estimates from 1994 and 2003
