Tank design and action of rainbow trout (Onchorhyncus mykiss)
2011
Heydarnejad, M.S., Shahrekord University, Shahrekord (Iran Islamic Republic). Fish and Fisheries Department
Tank design can influence fish behaviour, water flow characteristics and quality, and biological performance. In this study action of the rainbow trout is addressed under circular tank and raceway culture. Rainbow trout, hatched and grown in captivity, were graded, randomly selected and transferred to six circular tanks and six raceways supported by a freshwater recirculation system in a temperature-controlled and insulated room. Agonistic behaviour of each fish in the raceways was scored based on aggressive acts; these included chasing, nips and pushing. In discussion and conclusion: In any tank design however, attention is paid to water flow management, because current may affect feed distribution, fish swimming orientation and activity, schooling behaviour and agonistic responses. In the case of rainbow trout, tank design is one of the most important determining factors in fish distribution and orientation, total aggression and other physical and biological variables.
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