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Abstract
This study examined the effects of different overhead tank cover regimes during rearing of Rainbow Trout Onchorynchus mykiss. Three different overhead cover treatments were applied to circular tanks: near-full (98%), partial (65%), and no cover. Compared with tanks with no overhead cover, fish growth and feed conversion ratio were significantly improved in tanks with either partial cover or near-full cover. There were no significant differences in condition factor, visceral somatic index, hepatosomatic index, or hematocrit values in fish reared under either of the cover treatments. These results indicate that either partial or near-full covers may provide benefits during hatchery production of Rainbow Trout.
Received May 4, 2015; accepted August 30, 2015
ACKNOWLEDGMENTS
We thank Eric Krebs, Patrick Nero, Cory Hewitt, Kelby Torgerson, and Jeremy Kientz of the South Dakota Department of Game, Fish and Parks for their assistance with this study.