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Abstract
The aim of this study was to evaluate the growth performance of Geophagus brasiliensis rearedb under distinct temperatures (24.3 ± 0.9, 28.1 ± 1.0, and 31.7 ± 0.8°C) and feeding regimes (apparent satiety and a supply of 4% of the total biomass). About 500 wild-caught individuals were sorted and identified, to screen 180 fish to be used in the experiment (6.81 ± 1.15 g and 7.51 ± 0.47 cm). After a 55-day acclimatization period, the fish were distributed in experimental tanks, considering a double factorial randomized blocks scheme, composed of six treatments and three replicates. Growth performance parameters, somatic indexes and carcass yield were evaluated at the end of the experimental period (72 days). Fish fed to the point of apparent satiety presented higher (p <0.05) final weight, weight gain, specific growth rate and hepatosomatic index. The animals reared at a temperature of 24.3°C displayed higher (p <0.05) final weight, weight gain, specific growth, hepatosomatic index, lower visceral fat, and feed conversion index. It was concluded that G. brasiliensis presents higher productive indexes when fed until apparent satiety and reared in temperatures close to 24.3°C.
Highlights
Understanding the thermal behavior of fish is a useful tool for aquaculture development (Gómez, 2014; Gómez and Volpedo, 2017)
The aim of this study was to evaluate the growth performance of Geophagus brasiliensis reared under distinct temperatures (24.3 ± 0.9, 28.1 ± 1.0, and 31.7 ± 0.8°C) and feeding regimes
Fish fed to the point of apparent satiety presented higher (p
Summary
Understanding the thermal behavior of fish is a useful tool for aquaculture development (Gómez, 2014; Gómez and Volpedo, 2017). A viable and last-longing fish production is directly related to feeding, the costs with feed must be carefully monitored, as it may represent more than 60% of total production costs (Muñoz and Barroso, 2016; Trombeta et al, 2017; Milanez et al, 2019). In this sense, an adequate feeding regime might favor fish development, while avoiding economic losses associated with feed remains, besides mitigating negative impacts of the decomposing feed in water quality parameters (Américo et al, 2013)
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