Effects of stocking density on growth, yield and profitability of farming Nile tilapia, Oreochromis niloticus L., fed Azolla diet, in earthen ponds

Youssouf Abou, Emile D. Fiogbé, Jean Claude Micha

Research output: Contribution to journalArticle

109 Downloads (Pure)

Abstract

Two consecutive experiments were conducted to study the effects of stocking density on growth, food utilization, production and farming profitability of Nile tilapia (Oreochromis niloticus) fingerlings (initial mean weight: 16.2 ± 0.2 g) fed Azolla, as a main component in diet. In experiment 1, fish were hand-fed twice daily with three isonitrogenous (28.5% crude protein) and isocaloric (14.5 kJ g-1) diets A30, A35 and A40 containing 30%, 35% and 40% Azolla, respectively, for 90 days. Diets were formulated by mixing Azolla with locally available by-products. No significant differences were found in growth parameters and production (P>0.05). Total investment cost was significantly higher with A30 (P0.05). In experiment 2, three stocking densities, 1, 3 and 5 m-2, were assigned to three treatments T1, T2 and T3 respectively. Fish were hand-fed twice daily with diet A40. The final mean weight (89.53-115.12 g), the mean weight gain (0.81-1.10 g day-1), the specific growth rate (1.90-2.20% day -1) and the apparent food conversion ratio (1.29-1.58) were affected by stocking density, with significant difference (P-2, compared with the other densities. Stocking density did not affect survival rate (P>0.05). Yield and annual production increased with increasing stocking density, ranging from 7.10 ± 0.90 to 25.01 ± 1.84 kg are-1 and 28.79 ± 3.66 to 101.42 ± 7.48 kg are-1 year-1, respectively, with significant differences between all densities (P-2 produced the same profitability values. On the basis of growth values and economic return, it was concluded that Nile tilapia could be raised at a density of 3 fish m -2 with A40 to improve production and generate profit for nutritional security and poverty alleviation in rural areas. © 2007 Blackwell Publishing Ltd.

Original languageEnglish
Pages (from-to)595-604
Number of pages10
JournalAquaculture Research
Volume38
Issue number6
DOIs
Publication statusPublished - Apr 2007

    Fingerprint

Keywords

  • Azolla
  • Earthen pond
  • Food utilization
  • Growth
  • Oreochromis niloticus
  • Production
  • Profitability
  • Stocking density

Cite this