Abstract
We aimed at evaluating the effects of different water temperatures on the zootechnical performance of fat snook. The experiment lasted for 60 days, which was conducted in water recirculation systems, and was randomly designed with three treatments and three replicates each, corresponding to three water temperatures (25, 28 and 31°C). A total of 225 fat snook juveniles with a mean weight of 6.45 ± 0.58 g were used, which were fed daily until apparent satiety. Zootechnical parameters were assessed and feeding rates were registered for each tested temperature. Survival rates varied from 96 to 100% among treatments. Higher values of standard and total length, and weight gain were found in 28 and 31°C (p < 0.05). With regard to final weight, final biomass, feed conversion and specific growth rate, no significant differences were observed (p > 0.05). Feeding rates did not differ among evaluated temperatures. The results show that the used temperatures did not negatively affect zootechnical performance of fat snook juveniles.
Highlights
Brazilian marine fish farming began in the XVII century in Pernambuco, and the main produced species were snooks (Centropomus spp.), mullets (Mugil spp.) and mojarras (Eugerres diapterus)
Brazilian researches were performed with three main species for a long time, which received a lot of attention in the last 30 years: fat snook (Centropomus parallelus), mullet (Mugil brasiliensis) and the sole (Paralichthyis orbignyanus) (Cavalli et al, 2011)
Fat snook juveniles were acquired from the Laboratory of Marine Fish Farming of the Santa Catarina Federal University (LAPMAR - UFSC), where they were produced by induced spawning, according to the protocols described by Cerqueira and Tsuzuki (2009)
Summary
Brazilian marine fish farming began in the XVII century in Pernambuco, and the main produced species were snooks (Centropomus spp.), mullets (Mugil spp.) and mojarras (Eugerres diapterus). Brazilian researches were performed with three main species for a long time, which received a lot of attention in the last 30 years: fat snook (Centropomus parallelus), mullet (Mugil brasiliensis) and the sole (Paralichthyis orbignyanus) (Cavalli et al, 2011). Fat snook is one of the main candidates for Brazilian marine fish farming (Cerqueira & Tsuzuki, 2009). This species prefers waters near the coast, estuaries, coastal lagoons and rivers in South America
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