Technical Papers of the Bureau of Sport Fisheries and Wildlife PDF Download
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Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 758
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Book Description
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 758
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Fish-culture
Languages : en
Pages : 398
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Book Description
Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 534
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Book Description
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 736
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Book Description
Author: James L. Brauhn
Publisher:
ISBN:
Category : Fish-culture
Languages : en
Pages : 24
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Book Description
Prediction equations correlating density of fingerling rainbow trout with growth, yield, and food use efficiency indicated that ammonia nitrogen resulting from high fish densities wes responsible for reductions in all three factors. These predictable density-dependent responses present fish-culturists with alternatives of density selection for evaluation and attainment of specific goals. In examples, fish-culturists, by manipulating density, could achieve rapid growth, produce the maximum weight possible, balance yield with cost, optimize fish quality, or combine two or more of these goals.
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 206
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Book Description
Author: Byron Thomas Johnson
Publisher:
ISBN:
Category : Food chains (Ecology)
Languages : en
Pages : 20
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Book Description
A laboratory method of measuring the accumulation, transfer, elimination, and degradation of xenobiotic contaminants is described for organisms in a freshwater food chain (microorganisms, filter-feeder, and fish). A flow-through diluter-syste, C14-labeled contaminants, gas and thin-layer chromatography, autoradiography, and liquid scintillation spectrometry are used in making residue determinations. Accumulation factors and various index values are developed for measuring and estimating potential accumulation of xenobiotic contaminants by aquatic organisms. The laboratory procedure is economical, simple, reproducible, and ecologically relevant.
Author: Herman O. Sanders
Publisher:
ISBN:
Category : Aquatic invertebrates
Languages : en
Pages : 12
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Book Description
Application of the organophosphate insecticide Abate three times (at about monthly intervals) to duplicate 0.04 ha earthen ponds at 18 g/ha (4 micrograms/liter) -- the recommended application rate -- and 180 g/ha (40 micrograms/liter) caused no mortality on blugills. In ponds treated with 18 g/ha fewer bluegill fry were produced than in control ponds, brain acetylcholinesterase (AChE) activity was not affected, and accelerated growth of both fry and adults appeared to result from heavy feeding on dead or moribund Diptera larvae that resulted from the first two applications of Abate. The routine use of Abate at the recommended rate should have little adverse effect on fishery resources.
Author:
Publisher:
ISBN:
Category : Chlorohydrocarbons
Languages : en
Pages : 46
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Book Description
Author: Louis E. Vogele
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 22
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Book Description
Smallmouth bass were studied in Bull Shoals Lake to determine the nesting requirements and reproductive capabilities of the species in a reservoir. Underwater observations were conducted weekly in five study areas during the spawning seasons of 1969-76. Length of spawning season was affected by the rate of water temperature rise during the nesting period. Active nests were found at ambient temperatures of 13.3-22.5 degrees Centigrade. Nest were generally on gently sloping rock and gravel bottoms, beside permanent objects such as rocks or sunken logs, and at densities of less than one per 100 m of shoreline.
