Influence of Water Velocity and Vertically-Suspended Structures on Rainbow Trout Rearing Performance
Influence of Water Velocity and Vertically-Suspended Structures on Rainbow Trout Rearing Performance作者机构：South Dakota Game Fish and Parks McNenny State Fish Hatchery Spearfish South Dakota USA
出 版 物：《Open Journal of Animal Sciences》 (动物科学期刊（英文）)
年 卷 期：2020年第10卷第1期
页 面：152-161页
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：Environmental Enrichment Exercise Salmonid Oncorhynchus mykiss
摘 要：This study evaluated the effects of two water velocities and three types of vertically-suspended environmental enrichment during the rearing of juvenile rainbow trout (Oncorhynchus mykiss;mean ± SE, initial weight 4 ± 1 g and total length 71 ± 2 mm) in 1.8m diameter circular tanks. The 2 × 3 experimental design used two velocities (12.2 cm·s-1 and 30.5 cm·s-1) and three structural treatments (aluminum rod array, plastic spheres, or no structure). After 116 days, the fish reared without any structure (control) at 30.5 cm·s-1 had significantly lower total tank weight, gain, percent gain, feed conversion ratio, and specific growth rate compared to the other treatments. Similarly, the fish reared with a velocity of 30.5 cm·s-1 without structure were significantly shorter and lighter than those in the other treatments. There was no significant difference in condition factor and relative fin lengths among the treatments. These results indicate that vertically-suspended environmental enrichment may be impacting fish rearing performance by altering tank water velocities.
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