Abstract
AbstractThis study evaluated the effectiveness of two different environmental enrichment structures on the growth and condition of juvenile Rainbow Trout Oncorhynchus mykiss. Fish were reared in covered tanks with vertically suspended linear or spherical structures. Spherical structures were comprised of seven colored plastic balls that were vertically stacked and suspended on a string from the overhead tank covers, while linear structures consisted of vertically oriented aluminum rods. In the tanks with either of the environmental enrichment treatments, weight gain and feed conversion ratio were significantly improved relative to control tanks. Weight gain and feed conversion ratio were also significantly improved with the use of spherical structures compared to the use of linear structures. To provide substantial benefits during the rearing of Rainbow Trout in circular tanks, the use of vertically suspended spherical structures is recommended.
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