Abstract
Abstract Hatchery-reared coastal cutthroat trout (Oncorhynchus clarki clarki) are being stocked in waters with transient salinities as high as that of full-strength seawater (30‰). To determine if these hatchery fish can survive in full-strength seawater, yearling coastal cutthroat trout were tested in a 24-h challenge. All fish survived in fresh water and half-strength seawater (16.5–17.5‰). Thirteen of 72 fish died in seawater (28.5–29‰). There were significant differences in plasma sodium and osmotic concentration among fish exposed to different salinities as well as between surviving and moribund fish. During the experimental period of February–April 1990, survival among fish exposed to seawater was higher in both February and March than in April. Fish dying in April tests were larger than fish dying in February and March. We concluded that, if coastal cutthroat trout are to be released in full-strength seawater during February or March, the fish should weigh at least 50–60 g or exceed 130 mm in total length.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
