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Vertically-Suspended Environmental Enrichment Improves Growth of Landlocked Fall Chinook Salmon during Initial Hatchery Rearing

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Document pages: 7 pages

Abstract: Environmental enrichment has been shown to improvejuvenile salmonid growth during hatchery rearing. This study examined theeffects of vertically-suspended environmental enrichment starting seven daysafter feed training and continuing for the next 32 days of landlocked fallChinook salmon (Oncorhynchus tshawytscha) rearing. At the end of thisexperiment, final tank weights, gain, percent gain, and feed conversion ratiowere all significantly improved in the tanks of salmon with environmentalenrichment compared to barren tanks, with a nearly 25 improvement in feedconversion ratio. Individual salmon in tanks with environmental enrichment weresignificantly longer and weighed significantly more than salmon from tankswithout enrichment. Specific growth rate was also significantly improved withthe use of enrichment. The use of vertically-suspended environmental enrichmentto improve growth and rearing efficiency is recommended during the initialrearing of landlocked fall Chinook salmon.

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