Production performance of Litopenaeus vannamei (Boone, 1931) fed with different dietary levels of tilapia processing waste silage reared in biofloc system using two carbon sources

Abstract

The evaluation of alternative protein sources in aquafeeds is a priority in the aquaculture industry. Moreover, carbon sources in biofloc systems can directly affects the nutritional composition of flocs and consequently improve the shrimp growth. In this context, the aim of the present study was to evaluate different levels of tilapia processing waste silage (TPWS) in L. vannamei diets reared in biofloc system using two carbon sources: sugar cane molasses (SCM) and biofloc cassava flour (CF). The trial used two experimental systems (one for each carbon source) with thirty 40 L rectangular plastic bins in a density of 250 shrimp m−3. The juveniles (2.86 g ± 0.33 g) were distributed in a factorial completely randomized experimental design. The treatments were based on the percentage of TPWS inclusion (control or 0, 1.5, 3.0, 4.5 and 6.0% of inclusion) and on the carbon sources used (SCM and CF) totalizing ten treatments and three replicates. After 45 days, water quality parameters remained within the recommended range for L. vannamei culture. Regarding to the production performance survival was above 70% in all treatments. Final biomass and survival were not affected by diet, rather than carbon source (P < .05) with higher values in SCM treatments. Shrimp final weight was affect by the diet; whether treatments presented no differences except by 4.5% of TPWS inclusion presented the lowest value (P < .05). Feed conversion ratio showed no significant differences. In this sense, the sugar cane molasses (SCM) and the inclusion of tilapia processing waste silage (TPWS) emerge as a good option to increase sustainability in shrimp culture.