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

• Published in: Latin american journal of aquatic research Vol. 49; no. 1; pp. 155 - 168
• Main Authors: Jimenez-Ordaz, Francisco J, Cadena-Roa, Marco A, Pacheco-Vega, Juan M, Rojas-Contreras, Maurilia, Tovar-Ramirez, Dariel, Arce-Amezquita, Pablo M
• Format: Journal Article
• Language: English
• Published: Valparaiso Pontificia Universidad Catolica de Valparaiso, Escuela de Ciencias del Mar 01-03-2021; Pontificia Universidad Catolica de Valparaiso
• Subjects: Algae; Ammonium; Ammonium compounds; Aquaculture; Aquatic microorganisms; Bacillariophyceae; Bacteria; Biofloc technology; Carbon; Ciliates; Composition; Contamination; Conversion ratio; Diatoms; Dry weight; Environmental monitoring; Feed conversion; Feeds; Food conversion; Intensive aquaculture; Lactate; Lactic acid; Lactic acid bacteria; Lipids; Litopenaeus vannamei; Marine microorganisms; Microalgae; Microorganisms; Navicula; Nematodes; Nitrates; Nitrites; Nitrogen; Parameters; Penaeus vannamei; Phytoplankton; Probiotics; Protein composition; Schizochytrium; Seafood industry; Shellfish; Shrimp culture; Syrups & sweeteners; Tanks; Water quality; Weight; Mexico; Baja California Mexico
• ISSN: 0718-560X; 0718-560X
• DOI: 10.3856/vol49-issue1-fulltext-2442

Biofloc systems in Pacific white shrimp (Penaeus vannamei) culture generate floccules that remove wastes, and hence, biofloc formation is promoted for shrimp production. This study evaluated the induction of biofloc formation using microalgae and probiotic bacteria in hyper-intensive Pacific white shrimp culture. The experiment was performed for six weeks in tanks (28,000 L each) stocked 350 ind [m.sup.-3] and weight of 1400 [+ or -] 30 mg. Three treatments were assessed: 1) with two diatoms: Grammatophora sp. and Navicula sp., 2) with Navicula sp., and 3) without diatoms. All treatments were added with Schizochytrium sp. and Lactobacillus fermentum TD19. The following parameters were monitored during culture: ammonium, nitrites, nitrates, environmental variables, floccules volume, microorganism presence, the bromatological composition of biofloc, and growth performance parameters of P. vannamei. Our results indicated that the three induced biofloc presented a similar volume (8.34 [+ or -] 4.8 mL [L.sup.-1]) and ammonium concentration (<1.0 mg [L.sup.-1]). Treatment 1 generated floccules with the highest concentration of ciliates, rotifers, nematodes, lactic acid bacteria, and the lowest concentration of Vibrio spp. (1.2X[10.sup.3] UFC [mL.sup.-1]), evidencing a significant difference in bromatological composition, with the highest protein and lipid values (28.12 [+ or -] 0.50 and 22.44 [+ or -] 0.80% biofloc dry weight, respectively) and the best feed conversion ratio (0.89). Based on these results, we suggest that Schizochytrium sp., L. fermentum, and two diatoms should be used to induce biofloc in a hyper-intensive culture of P. vannmaei in order to provide a supplementary nutritional intake, which can constitute an advantage to reduce commercial feed rations.