Abstract
In a quantitative field research, the objective of this work was to determine the best stocking density for tambatinga juveniles (Colossoma macropomum × Piaractus brachypomus) in a recirculation system during 50 days of cultivation. Tambatinga juveniles (0.72±0.02 g) were distributed in 0.08 m3 polyethylene boxes with densities of 5, 10 and 15 fish/box, with five replicates per treatment. During the experimental period, water quality, weight gain, apparent feed conversion, specific growth rate, carcass yield, proximate composition and final survival were evaluated. The water parameters remained stable and in the desired range for the species during the experimental period (temperature 25±1.52° C, pH 5.85±0.7 and dissolved oxygen 6.51±0.05 mg L-1). Statistical analyzes showed no significant difference for apparent feed conversion and survival rate. The lowest stocking density (5 fish/box) showed greater weight gain and specific growth rate, while the density of 10 fish/box showed high lipid deposition in the carcass. Aiming at greater weight gain and better specific growth rate, the results indicated that the density of 5 fish/box (0.08 m3), is the most suitable for juveniles of this species.
Highlights
Aiming at greater weight gain and better specific growth rate, the results indicated that the density of 5 fish/box (0.08 m3), is the most suitable for juveniles of this species
Tambatinga, one of the fish most produced in the Brazilian Northeast, is a hybrid between the tambaqui (Colossoma macropomum) and pirapitinga (Piaractus brachypomus) which stands out in commercial aquaculture from tambaqui due to its rapid growth and from pirapitinga due to its high deposition of dorsal meat (Hashimoto et al 2002)
The experiment was performed in recirculation aquaculture systems (RAS) which consisted of 15 circular indoor tanks (0.08 m3 each), supplied with water from an artesian well and maintained by a biological filter
Summary
Tambatinga, one of the fish most produced in the Brazilian Northeast, is a hybrid between the tambaqui (Colossoma macropomum) and pirapitinga (Piaractus brachypomus) which stands out in commercial aquaculture from tambaqui due to its rapid growth and from pirapitinga due to its high deposition of dorsal meat (Hashimoto et al 2002). To provide better aquaculture management and promote fish welfare, it is necessary to determine an optimal stocking density (Samad et al 2014). Stocking density is defined as the amount or biomass of fish per unit area or volume. It is specific for each species; production system, age and weight of fish (Merino et al 2007), and can interfere with fish performance (Jobling & Baardvik 1994) and change fish behavior (Martins et al 2012). A stocking density study for tambatinga produced in RAS is necessary to develop management strategies as an alternative for regional aquaculture. In view of the above, the objective of this work was to evaluate the productive performance of tambatinga juveniles in a water recirculation system with different storage densities
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