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Effects of Electroshock Voltage, Wave Form, and Pulse Rate on Survival of Cutthroat Trout Eggs
Author(s) -
Dwyer William P.,
Erdahl David A.
Publication year - 1995
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1995)015<0647:eoevwf>2.3.co;2
Subject(s) - oncorhynchus , pulse (music) , biology , zoology , human fertilization , trout , pulse rate , fishery , voltage , anatomy , physics , fish <actinopterygii> , endocrinology , quantum mechanics , blood pressure
Eggs of cutthroat trout Oncorhynchus clarki were exposed for 10 s to continuous direct current (DC), pulsed DC (PDC) at 30 or 60 Hz, or the Coffelt Complex Pulse System (CPS®) wave form. Each treatment was conducted at 150 or 225 V. Treatments occurred every other day from fertilization to development of pigmentation in the eye. A different set of eggs (from the same pooled sample) was tested for each voltage‐frequency level and day (i.e., eggs were treated only once). Percent mortality at eye‐up of eggs exposed to 150 V PDC was no different from that of controls, whereas mortality of eggs exposed to 150 V DC was greater. Eggs exposed to PDC and DC at 225 V exhibited a significant increase in mortality when shocked on days 4–14 postfertilization. At the higher voltages, CPS also caused significant egg mortality. These results suggest that voltage level is more critical to egg survival than either wave form or pulse rate. If it is necessary to shock over redds, low voltages should be used regardless of the pulse rate or wave form.