Predicting Year-class Abundance of Yellowstone Lake Cutthroat Trout PDF Download
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Author: Ross V. Bulkley
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 21
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Book Description
Author: Ross V. Bulkley
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 21
Get Book Here
Book Description
Author: Ross V. Bulkley
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 32
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 21
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Book Description
Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category :
Languages : en
Pages : 652
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 802
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Book Description
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 32
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Book Description
Author: Roger E. Burrows
Publisher:
ISBN:
Category : Excretion
Languages : en
Pages : 20
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Book Description
In experiments at the Bureau's Salmon-Cultural Laboratory, to determine the excretory products of significance in rearing ponds and the possible effect of these products on fingerling chinook salmon (Oncorhynchus tshawytscha), the results demonstrated that ammonia and urea are the principal products. The relative amounts of these products vary with the concentration of fish and with their metabolic activity. Ammonia assumes dominance in an unfavorable environment. Water temperature, pH, and pond type affect the toxicity of ammonia solutions. Continuous exposure to levels of ammonia normally encountered in rearing ponds produced extensive hyperplasia of the gill epithelium in controlled experiments.
Author: Allan E. Thomas
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
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Book Description
A stamina tunnel was developed to measure differences in physical performance of salmonid fingerlings. By subjecting fish samples to controlled patterns of water velocity, it has proved possible to demonstrate differences in fish stamina imparted by disease, nutrition, and environment.
Author: W. G. Smith
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 32
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Book Description
Summer flounder eggs and larvae are described from artificially fertilized specimens and from material collected at sea, accompanied by a set of illustrative plates.
Author: Douglas H. Evans
Publisher:
ISBN:
Category : Sailfish
Languages : en
Pages : 40
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Book Description
Stomach contents of 924 striped marlin landed in the sport catches at Mazatlan, Sinaloa, and Buena Vista, Baja California, Sur, Mexico, and San Diego, California, and of 197 sailfish from Mazatlan and Buena Vista were examined. The striped marlin and sailfish fed primarily on pelagic fishes and cephalopods. By volume the major foods were squid (principally Dosidicus gigas) for striped marlin at Mazatlan and for striped marlin and sailfish at Buena Vista, northern anchovy for striped marlin at San Diego, and threadfin for sailfish at Mazatlan. Locally differences in food habits were pronounced, and some seasonal and yearly differences were found.
