Cultivation of pink shrimp Farfantepenaeus brasiliensis in a biofloc system at different temperatures: nursery and compensatory growth
The present study aimed to evaluate the effect of different temperatures in the nursery and compensatory growth of the pink shrimp Farfantepenaeus brasiliensis in a biofloc system (BFT). In the first experiment, post-larvae with a mean weight of 0.015g were cultured for 30 days and exposed to 5 treatments with 5 repetitions: 21 ° C, 24 ° C, 27 ° C, 30 ° C and 33 ° C. Each experimental unit received 10% biofloc inoculum. At the end of the nursery phase, the average weight increased with temperature, being significantly different (p <0.05) between treatments: 0.10 g (21 ° C); 0.18g (24 ° C); 0.27g (27 ° C); 034g (30 ° C) and 0.49g (33 ° C). However, survivals were higher at lower temperatures, with 81% (21 ° C), 80% (24 ° C) and 80% (27 ° C) and lower at higher temperatures 65% (30 ° C) and 26% (33 ° C).From the results of performance and water quality obtained, it was determined that the appropriate temperature for the nursery of F. brasiliensis was between 27 and 30 ° C. In the second experiment, the prawns were acclimated and restocked at 30 ° C, in order to verify the compensatory growth. The treatments were then named as follows: 21 ° C (30), 24 ° C (30), 27 ° C (30), 30 ° C (30) and 33 ° C (30), with 5 repetitions. This experiment lasted 15 days, and the bioflocs from the nursery phase were reused. As a result, it was possible to observe that 21 ° C (30) presented the highest specific growth rate (TBI) in relation to the other treatments, demonstrating the compensatory growth. This same treatment equaled the final weight at 24 ° C (30) and 27 ° C (30), showing full compensatory growth.In relation to 30 ° C (30) and 33 ° C (30), the final weights remained lower, which characterizes partial compensatory growth. The information obtained in this study may be important for the increase in the technological package for the cultivation of Farfantepenaeus brasiliensis, especially in regions with lower temperatures, in which the nursery phase can be carried out during the spring, for later storage in the fattening structures with the increase in room temperature.in which the nursery phase can be carried out during the spring, for later storage in the fattening structures with the increase of the ambient temperature.