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Author: Donald W. Novotny
Publisher:
ISBN:
Category : Electric fishing
Languages : en
Pages : 52
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Book Description
Author: Donald W. Novotny
Publisher:
ISBN:
Category : Electric fishing
Languages : en
Pages : 52
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Book Description
Author: A. Lawrence Kolz
Publisher:
ISBN:
Category : Electric conductivity
Languages : en
Pages : 36
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Book Description
Author: Donald J. Klemm
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 372
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Book Description
Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 904
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Book Description
Author:
Publisher:
ISBN:
Category : Aquatic biology
Languages : en
Pages : 170
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Book Description
Experimental releases of water from Glen Canyon Dam to conserve fine sediments and reduce non-native fish will be combined with mechanical removal of non-native fish to benefit native fish, particularly the endangered humpback chub.
Author: Darrel E. Snyder
Publisher:
ISBN:
Category : Electric fishing
Languages : en
Pages : 164
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Book Description
Electrofishing, which involves a very dynamic and complex mix of physics, physiology, and behavior; has been a valuable sampling technique for over half a century, but its potentially harmful effects on fish must be recognized, monitored, and avoided or minimized, especially with respect to populations of endangered species. Spinal injuries and associated hemorrhages, although often not externally obvious or fatal, can occur anywhere in the electrofishing field at or above the intensity threshold for twitch. These injuries are believed to result from powerful convulsions 0 body musculature caused mostly by sudden changes in voltage. Significantly fewer spinal injuries are reported when direct current, low-frequency pulsed direct current (#30 Hz), or specially designed pulse trains are used. Salmoninae are especially susceptible. Endangered cyprinids of the Colorado River Basin are generally much less susceptible, but the endangered catostomid Xyrauchen Texanus appears sufficiently susceptible to warrant minimal-use policy. Other harmful effects, including bleeding at gills or vent and excessive physiological stress, are also of concern. Mortality, usually by asphyxiation, is a common result of excessive exposure to tetanizing intensities near electrodes or poor handling of captured specimens. Reported effects on reproduction are contradictory, but electrofishing over spawning grounds can harm embryos.
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 680
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Author: Thomas P. Simon
Publisher: CRC Press
ISBN: 1000141381
Category : Science
Languages : en
Pages : 700
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Book Description
This book examines the application of fish community characteristics to evaluate the sustainability and biological integrity of freshwaters. Topics include perspectives on use of fish communities as environmental indicators in program development, collaboration, and partnership forming; influence of specific taxa on assessment of the IBI; regional applications for areas where the IBI had not previously been developed; and specific applications of the IBI developed for coldwater streams, inland lakes, Great Lakes, reservoirs, and tailwaters.
Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 344
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Book Description
Author:
Publisher:
ISBN:
Category : Aquatic resources
Languages : en
Pages : 210
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Book Description
