Download or read book Abundance Length Age Mortality and Maximum Sustained Yield of Cutthroat Trout at Turner and Baranof Lakes Southeast Alaska 1994 Through 2003 written by Roger Dean Harding and published by . This book was released on 2009 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document reports on stock assessment data for cutthroat trout based on mark-recapture studies conducted from 1994 through 2003 at Turner and Baranof Lakes, southeast Alaska.
Download or read book Abundance and Length Composition of Cutthroat Trout in Florence Turner and Young Lakes Southeast Alaska 1994 written by Roger Dean Harding and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance Length Composition and Annual Mortality of Cutthroat Trout at Neck Lake Southeast Alaska 1996 Through 1998 written by Roger Dean Harding and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance and Size of Cutthroat Trout at Baranof Lake Southeast Alaska 1994 written by John Aram Der Hovanisian and published by . This book was released on 1995 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance and Length Composition of Cutthroat Trout in Turner Lake Southeast Alaska 2005 and Summary of 2004 Field Studies in Turner Lake written by Peter D. Bangs and published by . This book was released on 2008 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document reports on the results of a two-event mark-recapture study which was conducted at Turner Lake in 2005 to estimate the abundance and length composition of cutthroat trout, Oncorhynchus clarki. Summary data for the 2004 study is also given.
Download or read book Maturity Fecundity Growth and Sustained Yield of Coastal Cutthroat Trout at Florence Lake Southeast Alaska written by Matthew Birch Foster and published by . This book was released on 2003 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Abundance and Length Composition of Cutthroat Trout in Florence Lake Southeast Alaska 2003 written by Peter D. Bangs and published by . This book was released on 2009 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Fluctuations in Age Composition and Growth Rate of Cutthroat Trout in Yellowstone Lake written by Ross V. Bulkley and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Age composition, growth rate, and year-class strength of Yellowstone Lake cutthroat trout from collections made in 1948 and from 1950 to 1959 are analyzed to relate total catch changes in age composition and growth rate. An increase in growth rate of fish fully recruited to the fishery and a decrease in percentages of fish belonging to age groups VI and VII are attributed to an increase in fishing pressure. Mean age of the catch varied with year-length of the catch has remained high, suggesting that production is more efficient now than in past years. Maximum equilibrium yield may be near. If the catch continues to increase at the present rate, it may become excessive within the next few years.
Download or read book Scale Aging Manual for Coastal Cutthroat Trout from Southeast Alaska written by Randolph P. Ericksen and published by . This book was released on 1999 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance and Length Composition of Cutthroat Trout in Florence Lake Southeast Alaska 2002 written by Peter D. Bangs and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Mortality Studies on Cutthroat Trout in Yellowstone Lake by Orville P Ball and Oliver B Cope written by Orville P. Ball and published by . This book was released on 1961 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Predicting Year class Abundance of Yellowstone Lake Cutthroat Trout written by Ross V. Bulkley and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluctuations in strength of year classes from 1945 to 1956 of Yellowstone Lake cutthroat from Pelican and Chipmunk Creeks are compared with the parental stock and several climatically influenced factors of the environment. Variations in year-class strength in the two tributaries were highly correlated with fluctuations in lake water levels. Strong year classes occurred in yeas of low water. Female spawner escapement, timing of the runs, and summer air temperatures were not significant factors. A formula based on water levels is presented for predicting year-class strength in Pelican Creek and in the Fishing Bridge area fishery. Stocking of fry in years of high water is suggested as a means of supplementing natural production. A method of forecasting lake water levels several months in advance of their occurrence is discussed.
Download or read book Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake written by Norman Gustaf Benson and published by . This book was released on 1963 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equilibrium yield of the cutthroat trout, Salmo clarki lewisi Girard, in Yellowstone Lake, Wyo., is determined from data on catch and spawning runs from 1945 to 1961. Changes in growth rate, spawning runs, mortality rates, and year-class strength are related to differences in total catch. Three stages of exploitation of the stock are defined and the maximum safe catch or equilibrium yield is estimated at 325,000 trout. Management of the sport fishery according to equilibrium yield is discussed with reference to regulations, distribution of fishing pressure, planting, and interspecific competition. The Yellowstone River fishery is treated briefly.
Download or read book Abundance and Length Composition of Cutthroat Trout at Halfway House Lake Southeast Alaska 2019 written by Craig J. Schwanke and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The population status of cutthroat trout Oncorhynchus clarkii at Halfway House Lake in Southeast Alaska was examined in June 2019. A 2-event mark–recapture experiment was used to estimate abundance and length composition. Fish were caught using baited hoop traps, baited funnel traps, and hook and line and sampled for species and length. Abundance of cutthroat trout >180 mm fork length (FL) was 222 (SE = 16). Most of the cutthroat trout >180 mm FL were 200 mm FL (pp180−199 = 0.83, SE = 0.03). The length composition of Dolly Varden Salvelinus malma in Halfway House Lake was also assessed. The mean length of Dolly Varden 180 mm FL was 192.7 (SE = 1.3) with most fish
Download or read book Abundance and Length Composition of Cutthroat Trout at Patching Lake Southeast Alaska 2005 written by Peter D. Bangs and published by . This book was released on 2007 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document reports on the results of a two-event mark-recapture study which was conducted at Patching Lake in 2005 to estimate the abundance and length composition of cutthroat trout, Oncorhynchus clarki.
Download or read book Cutthroat Trout Studies written by Jesse Douglas Jones and published by . This book was released on 1991 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of mark-and-recapture experiments to estimate abundance of cutthroat trout (Oncorhynchus clarki) in Turner Lake southeast of Juneau and in Florence Lake on Admiralty Island, in southeast Alaska.
Download or read book Size and Abundance of Cutthroat Trout in Small Southeast Alaska Lakes 1993 written by Artwin Schmidt and published by . This book was released on 1994 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report of a mark-recapture experiment carried out in 1993 to estimate the length frequency distribution of cutthroat trout (Oncorhynchus clarki) in 14 landlocked lakes in southeast alaska and abundance in three small landlocked lakes.
