Evaluation of a New Baffle Design for Solid Waste Removal from Hatchery Raceways

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Abstract
A modification of the Boersen–Westers baffle system for low water flows was evaluated. No differences occurred in growth or in the parameters of the health-and-condition profile of rainbow trout (Oncorhynchus mykiss) held in raceways with or without baffles. Distribution of dissolved oxygen in the raceways was similar in control raceways and those with baffles. Mortality was significantly higher in raceways without baffles (4.6%) than in baffled raceways (3.7%), although the strength of the association was weak. Observations during midday indicated no agonistic behavior among the fish in either the control raceways or baffled raceways.

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