Abstract
Abstract. In this paper the authors aim to emphasis the way in which the environmental factors act on the growing rhythm at an population of rainbow trout ( Oncorhynchus mykiss ), reared within classical rearing system. Biological material was represented by embryonated roes brought Brade Trandafir fishery RemeE›i, from Bihor. These was been studied from larva stage (X±sx=0.07±0.001g) till the delivery weight (X±sx=266.70±0.544g). For 480 days, in which there were monitored medial parameters of water and growth indices. Hydrological characteristics of the BistriAŸorii Valley had been framed with the water temperature between a minimum of 4.6 o C in December and a maximum of 17.5 o C in July of the year 2011 but in the next year 2012 obtained a minimum of 3.9 o C in January and a maximum of 21.7 o C in July. Growth indices (TG, and DWG) presented the following values: TG=266.63; DWG=0,573. To obtain a high quality meat and economic efficiency it is necessary to establish a proper strategy for planning fish production, taking into account the influence of environmental, nutritional and genetic factors.
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