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The effects of Heterosigma akashiwo on juvenile Oncorhynchus tshawytscha and its implications for fish culture
Author(s) -
Black E. A.,
Whyth J.N. C.,
Bagshaw J. W.,
Ginther N. G.
Publication year - 1991
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1991.tb00523.x
Subject(s) - heterosigma akashiwo , biology , oncorhynchus , fish mortality , juvenile , juvenile fish , algal bloom , fishery , acclimatization , gill , chinook wind , fish kill , fish <actinopterygii> , zoology , ecology , phytoplankton , nutrient
Summary The effects of natural blooms of Heterosigma akashiwo on freshwater‐and saltwater‐acclimated juvenile chinook salmon were assessed. Rates of fish mortality in the blooms were independent of acclimation of fish to seawater and the ambient oxygen levels, but were dependent on concentration of algae and ambient water temperatures. No pathological abnormality to gills or other internal organs in the fish were evident. Aeration or oxygenation of fish cages did not enhance or inhibit fish survival in a H. akashiwo bloom. Cause of death was considered to be due to a labile ichthyotoxic agent.