Reducing Electrofishing-Induced Injury of Rainbow Trout

Autor:	J. C. De Vos, D. A. House, S. W. Carothers, Norman G. Sharber, J. P. Sharber
Rok vydání:	1994
Předmět:	Pulse repetition frequency Materials science Ecology Pulse (signal processing) Direct current High voltage Management Monitoring Policy and Law Aquatic Science Molecular physics Anode Electrofishing Rainbow trout High incidence Ecology Evolution Behavior and Systematics
Zdroj:	North American Journal of Fisheries Management. 14:340-346
ISSN:	1548-8675 0275-5947
DOI:	10.1577/1548-8675(1994)014<0340:reiior>2.3.co;2
Popis:	We conducted three sets of experiments to determine aspects of pulsed direct current responsible for high incidence of spinal injury in electrofished rainbow trout Oncorhynchus mykiss and to test the electrotaxis efficiency of a new complex pulse pattern (low-frequency bursts of high-frequency pulses). In the first set of experiments, we energized three types of anodes with current pulsed at 60 pulses per second (pps) to produce fields with relatively low, intermediate, or high voltage gradients near the anode. Results showed no direct relationship between voltage gradient and injury rate. In the second set of experiments, we tested the complex pulse pattern and four other pulse frequencies using a spherical anode. The results demonstrated a low injury rate with the complex pulse pattern and a curvilinear increase in spinal injuries with rising pulse frequency. Moderate to high pulse frequencies, therefore, rather than high voltage gradients, appear to be the primary cause ofspinal injury. We sug...
Databáze:	OpenAIRE
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