Abstract
Developing a rearing technology requires the determination of the optimum stocking density. This study aimed to determine the best stocking density for Brycon orthotaenia juveniles grown in net cages, during the rearing phase. The research was conducted at the Experimental Farm of EPAMIG, in Felixlândia, Minas Gerais State, in the Tres Marias Reservoir. 9,000 fingerlings were distributed into 12 net cages, 2 m 3 each, according to a completely randomized design with three replications and four different stocking densities (150, 300, 450, 600 fish m -3 ). Random samples were taken from each net cage, at the onset of the experiment and at 60 rearing days, to assess production parameters, specific growth rate and uniformity. We verified a positive linear relationship (p 0.05) for growth parameters, uniformity and final weight. It can be concluded that the density of 300 fish m -3 is the most suitable, because it provides higher net revenue,
Highlights
Brycon orthotaenia commonly known as matrinxã has a great potential for production, whose national production in 2010 reached 5000 tons (BRASIL, 2010)
Studies related to growth performance of Brycon orthotaenia in net cages during the rearing phase have been
The present study aimed to determine stocking densities of the matrinxã B. orthotaenia, during the rearing period, in nurseries installed in net cages
Summary
Brycon orthotaenia commonly known as matrinxã has a great potential for production, whose national production in 2010 reached 5000 tons (BRASIL, 2010) This species is appreciated in sport fishing for its aggressive behavior, shows good indices of growth for commercial production like weight gain and feed conversion, besides high quality meat (IZEL et al, 2004). In order to attract the interest of fishermen and small farmers, research has to provide technologies and technical and economic information on the cultivation of native species, highlighting their competitiveness and economic sustainability In this way, there is not yet mastery of techniques at all stages of production. The present study aimed to determine stocking densities of the matrinxã B. orthotaenia, during the rearing period, in nurseries installed in net cages. In this context, aimed to determine the stocking densities for matrinxã (Brycon orthotaenia), during the rearing phase in nurseries installed in net cages
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