Abstract
Because recirculating systems for breeding fish (in general) and trout (in particular), are more and more used in fish production and aquaculture, we investigated the influence of two different growth systems (classic system vs. recirculating system) on the fish health. Physiological status of trout was evaluated by histological investigations made ​​at the liver level. At trout reared in the classical system, histological changes have not been major. At trout reared in a recirculating system, where environmental conditions are maintained at optimum parameters, voluntary feed intake (much enhanced by optimal environmental conditions), led to the appearance of massive lipid inclusion, such as the liver appears to be a hypertrophic fat mass. This may lead to the occurrence of the diseases and could endanger fish production.
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