Microalgae and probiotic bacteria as biofloc inducers in a hyper-intensive Pacific white shrimp (Penaeus vannamei) culture

Biofloc systems in Pacific white shrimp (Penaeus vannamei) culture generate floccules that remove wastes, and hence, biofloc formation is promoted for production. This study evaluated the induction of using microalgae probiotic bacteria hyper-intensive culture. The experiment was performed six weeks tanks (28,000 L each) stocked 350 ind m-3 weight 1400 ± 30 mg. Three treatments were assessed: 1) with two diatoms: Grammatophora sp. Navicula sp., 2) 3) without diatoms. All added Schizochytrium Lactobacillus fermentum TD19. following parameters monitored during culture: ammonium, nitrites, nitrates, environmental variables, volume, microorganism presence, bromatological composition biofloc, growth performance P. vannamei. Our results indicated three induced presented a similar volume (8.34 4.8 mL L-1) ammonium concentration (<1.0 mg L-1). Treatment 1 generated highest ciliates, rotifers, nematodes, lactic acid bacteria, lowest Vibrio spp. (1.2×103 UFC mL-1), evidencing significant difference composition, protein lipid values (28.12 0.50 22.44 0.80% dry weight, respectively) best feed conversion ratio (0.89). Based on these results, we suggest L. fermentum, diatoms should be used to induce vannmaei order provide supplementary nutritional intake, which can constitute an advantage reduce commercial rations.