Partial replacement of fishmeal with biofloc meal in the diet of postlarvae of the Pacific white shrimpLitopenaeus vannamei

Abstract

This study evaluated the potential for the replacement of fishmeal (FM) by biofloc meal (BM) in the diet of Litopenaeus vannamei postlarvae. Four isonitrogenous (437.42 g kg À1 ) and isocaloric (19.84 kJ g À1 ) 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 L tanks connected to a water recirculation system. All tanks were stocked with three postlarvae (initial weight 0.0023 g) per litre. 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. As the T30 treatment returned a significantly (<0.05) 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 L. vannamei postlarvae diets, the production of meal also represents a more sustainable way of disposing of the excess of biofloc produced by BFT systems.

Compensatory growth and digestive enzyme activity of Litopenaeus vannamei submitted to feeding restriction in a biofloc system

“…Nevertheless, shrimp in the Control treatment exhibited higher growth performance during the feeding restriction phase. Although bioflocs are a source of several nutrients (Dantas et al, ; Ekasari et al, ), they were not enough to maintain weight gain during the fasting cycles in the present study. However, the fasting did not affect negatively shrimp survival and they probably used the biofloc in an attempt to meet their energy requirement for maintenance.…”

Assessment of the relative contribution of dietary nitrogen from fish meal and biofloc meal to the growth of Pacific white shrimp (Litopenaeus vannamei )

“…Another important aspect to take into consideration is that the biofloc meal used in the present study was collected from a freshwater system containing tilapia, therefore the nutritional characteristics might be inferior to those in biofloc collected from shrimp farms. For example, Dantas, Valle, Brito, Calazans, Peixoto and Soares () recently reported that up to 30% of fish meal in diets for L. vannamei was successfully replaced by a biofloc meal collected from shrimp tanks.…”

Potential of microbial‐derived nutrients for aquaculture development

“…; Dantas et al . ), although others processes have already been successfully replicated, upscaled and patented. Some of the final microbial products have been or will be specifically aimed at the animal nutrition sector and aquaculture industry (Glencross et al .…”

“…Lee and Kim (2001) demonstrated that production costs of yeast Candida utilis could be significantly reduced (1.08-2.76 USD kg dry weight) by using molasses instead of complex media as nutrient substrate. Alternative methods for the production of yeasts and bacterial biomass using waste by-products derived from the food and agriculture industries are currently in experimental stage (Nouska et al 2015;Dantas et al 2016), although others processes have already been successfully replicated, upscaled and patented. Some of the final microbial products have been or will be specifically aimed at the animal nutrition sector and aquaculture industry (Glencross et al 2014;BFD 2015;WEF 2015).…”