Hatchery trout benefit from complexity in rearing tanks... structures designed to minimize interference with hatchery ops

摘要

The potential impact of structural complexity on the rearing performance of juvenile fish has largely been ignored, but researchers in the US State of South Dakota recently investigated whether it would benefit trout during the early lifecycle stage in the same way that complexity has shown to improve post-stocking survival.Hatchery staff at the mid-western state's McNenny State Hatchery in Spearfish examined the growth and condition of juvenile rainbow trout reared in nearly fully covered circular tanks containing nine vertically oriented round aluminum rods (structurallycomplex) compared with that of trout reared in almost fully covered tanks with no rods (control).