Author: Roger E. Burrows
Publisher:
ISBN:
Category : Fish ponds
Languages : en
Pages : 32
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Of the ponds studied, no one type could be considered superior under all conditions of fish-cultural operations. The Foster-Lucas pond, however, was definitely inferior to either the circular or raceway type.
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 1358
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 644
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Author: Paul H. Eschmeyer
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 172
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Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category :
Languages : en
Pages : 652
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Author: Roger E. Burrows
Publisher:
ISBN:
Category : Excretion
Languages : en
Pages : 20
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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:
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ISBN:
Category : Government publications
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 218
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Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 20
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Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 634
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