Evaluation of Cone-Bottom Cages for Removal of Solid Wastes and Phosphorus from Pen-Cultured Rainbow Trout

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Abstract
Solid wastes recovered daily from rainbow trout (Oncorhynchus mykiss) in laboratory trials averaged 16.6% of the feed consumed. When rainbow trout were reared outdoors in cone-bottom cages and fed the same floating feed, recovery of solids from the cages by daily pumping averaged 16.3% when cages were in calm water but only 3.6% when cages were in strong water currents. Based on estimates of phosphorus concentrations in feed, fish, and solids, 24-h-interval pumping from cages in calm water removed 35% of the total phosphorus fed to the fish and 45% of the phosphorus that would have been lost to the environment. Daily pumping of wastes from customized cages modified to trap settleable solids was a simple and effective method of reducing water quality degradation under our experimental conditions.

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