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November 13, 2014

Brazil

Research—Bioflocs Replace Fishmeal in PL Diets

 

From Abstract: This study evaluated the potential for the replacement of fishmeal (FM) with biofloc meal (BM) in the diet of Penaeus vannamei postlarvae.  Four isonitrogenous [equal amounts of protein] and isocaloric [equal number of calories] diets were formulated in which FM was replaced with BM at 0% (T0), 7.5% (T7.5), 15% (T15) and 30% (T30).  A commercial diet (CD) was used as reference.  The study was conducted over 42 days in 50-liter tanks connected to a recirculation system.  All tanks were stocked with three postlarvae (initial weight 0.0023 grams) per liter.  Shrimp survival, weight gain (WG), final weight (FW), specific growth rate (SGR) and protein efficiency ratio (PER) were measured.  Survival rates were high (>91.1%) in all treatments.  Since the T30 treatment returned a significantly better performance in WG, FW, SGR and PER than all other treatments, partial replacement of FM with BM does not appear to affect productivity.  In fact, a regression analysis indicated that a FM to BM replacement level of over 20% may actually improve shrimp growth.  In addition to providing a cost-effective alternative ingredient for P. vannamei postlarvae diets, the use of biofloc meal also represents a more sustainable way of disposing of the excess of biofloc produced in biofloc systems.

 

Source: Aquaculture Nutrition.  Partial Replacement of Fishmeal With Biofloc Meal in the Diet of Postlarvae of the Pacific White Shrimp Litopenaeus Vannamei.  E.M. Dantas, Jr. (email jr_pesca@hotmail.com, Laboratório de Tecnologia em Aquicultura Departamento de Pesca e Aqüicultura, Universidade Federal Rural de Pernambuco, UFRPE, R. Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil), B.C.S. Valle, C.M.S. Brito, N.K.F. Calazans, S.R.M. Peixoto and R.B. Soares.  Article first published online November 10, 2014.

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