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Practical Observations on the Use of Eggs from Electroshocked Females during Spawning of Inland Fall Chinook Salmon
Author(s) -
Barnes Michael E.,
Lott John P.,
Sayler William A.,
Cordes Rick J.
Publication year - 1999
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(1999)061<0162:pootuo>2.0.co;2
Subject(s) - electrofishing , chinook wind , broodstock , biology , oncorhynchus , fishery , fish <actinopterygii> , zoology , aquaculture
Eggs were obtained on three spawning dates in 1997 from female chinook salmon Oncorhynchus tshawytscha that had either been caught by electrofishing or were passively captured with a fish ladder. The number of eggs per female and egg size were not significantly different between the broodfish captured by each method. Though not statistically significant, survivals to egg eye‐up and to fry swim‐up were consistently greater for eggs from the females captured at the fish ladder on each spawning date. Eggs collected from females that died after being electroshocked exhibited low rates of survival. Deleterious effects of handling ripe females during electrofishing were observed and probably contributed to the lower embryo survival rates on at least one occasion. If female broodfish must be captured by electrofishing methods, care should be taken to minimize any associated handling of the fish.