Densité d'élevage chez la truite arc-en-ciel (Onchorynchus mykiss W.). Conséquences sur la qualité de la chair et l'état apparent

A triploid strain of rainbow trout (Onchorynchus mykiss) was reared in two experiments testing density effect on growth and flesh quality. Physiological index and corporal condition were also considered. Environmental  parameters were maintained identical between densities. Two fold 20, 50 and 80 Kg m·3 stocking densities were reared at 1.3% daily ration. No differences were found in fish growth neither in fish quality. A second experience compared two densities (50 and 110 kg m-3 ) and oxygen supplementation. Fish were fed ad libitum. Weight gain diminished at higher densities and oxygen supplementation had a favourable effect on fish growth. No differences were found in flesh quality parameters tested.