Dietary protein reduction for Nile tilapia fingerlings reared in biofloc technology

Abstract

The objective of this study was to evaluate the growth performance of Nile tilapia fed diets with 28, 32, and 36% crude protein (CP) in biofloc technology (BFT) and to verify its influence on water quality and hematological parameters.The experimental design was completely randomized with three treatments (28, 32, and 36% CP) and six replicates.Nile tilapia (n = 270, 6.31 ± 0.40 g) were randomly distributed in 18 aquaria-200 L (15 fish/aquarium), over a period of 60 days. No differences (p > .05) were observed among the treatments for the growth performance and hematological parameters. The volumes of nitrite and sedimentable solids showed higher values with 36% CP, which differed (p < .05) in comparison to 28% CP. Different levels of dietary CP content (36, 32 and 28% CP) do not influence the growth performance and health of Nile tilapia (6-25 g) reared in BFT. Thus, an 8% reduction in dietary protein (28% CP) can generate savings in terms of the costs of production and can decrease the environmental impact of excess dietary protein. K E Y W O R D S aquaculture system, diets, Oreochromis niloticus, sustainability

​Effect of Distillery Spent Wash as Carbon Source in Biofloc System on Nutrient Profile of GIFT Tilapia

“…The availability of balanced protein diet (biofloc) and stress free environment (lower nitrite and ammonia) may be the major reason for the growth performance of GIFT compared to a high CP supplementary diet in the biofloc Effect of Distillery Spent Wash as Carbon Source in Biofloc System on Nutrient Profile of GIFT Tilapia system. According to Hisano et al (2020), tilapia have been feeding with 36, 32 and 36% of CP diet in nursery BFT (sugar cane molasses used as carbon source) and no significant difference was observed in terms of growth performance among treatments, but, the author suggested that 28% of CP reduced the feed cost and environmental impact. Floc encompassed low crude lipid and high crude fibre.…”

Study on floc characteristics and bacterial count from biofloc‐based genetically improved farmed tilapia culture system

“…(2020) and Hisano et al. (2020) in BFT‐based tilapia culture. TSS (589 mg/l) and BOD (8.4 mg/l) values of the present study were superior than the study of Caipang et al.…”

Mixed culture microorganisms fermented soybean meal improves productive performance and intestinal health of Nile tilapia ( Oreochromis niloticus ) juveniles fed plant‐based diets in a biofloc system

“…Long‐term studies can highlight the differences between treatments. In addition, the BFT system may have positive effects on fish performance (Hisano et al, 2019; Da Silva et al, 2018) and may have masked the effects of treatments. The relationship between fermented products and production systems still needs to be better studied and understood.…”