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Seawater Challenge of Coho Smolts Exposed to Endothall

Publication number Date Published
93-e52February 1993
VIEW NOW Seawater Challenge of Coho Smolts Exposed to Endothall (Number of pages: 8) (Publication Size: 474KB)

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Author(s) Serdar, D. and A. Johnson
Description A two-step procedure was used to determine if the contact herbicide endothall affected the ability of smolting coho salmon (Oncorhynchus kisutch) to survive in the marine environment. Thirty healthy smolts were first exposed to 5 mg/L endothall in freshwater for 96 hours, then challenged by seawater for 24 hours. Blood plasma sodium was measured as an indicator of the smolts' ability to osmoregulate. There was essentially no difference in plasma sodium concentrations of exposed fish (mean = 171 meq/L) compared to control fish (mean = 170 meq/L). These concentrations are consistent with those reported for fully smolted coho following a 24-hour seawater challenge.
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Keywords sodium, fish, salmon, marine, herbicide