Author: Harvey L. MoorePublisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 48
Book Description
Yellowstone Lake Trout Creel Census, 1950-51
Author: Harvey L. MoorePublisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 48
Book Description
Special Scientific Report
Author: Mortality Studies on Cutthroat Trout in Yellowstone Lake [by] Orville P. Ball and Oliver B. Cope
![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. BallPublisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 72
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.
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1500
Book Description
Creel Census and Expenditure Study, Madison River, Montana, 1950-52
Author: Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake
Author: Norman Gustaf BensonPublisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 52
Book Description
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.
SAMPLING PROBLEMS IN THE MICHIGAN CREEL CENSUS.
Author: Howard David TaitPublisher:
ISBN:
Category : Zoology
Languages : en
Pages : 298
Book Description
The Progressive Fish-culturist
Author: Research Report
Author: Artificial Fertilization of Lakes and Ponds
Author: John A. MaciolekPublisher:
ISBN:
Category : Fertilizers
Languages : en
Pages : 1270
Book Description