Enhancing productivity of Labeo victorianus ponds using maize flour as a carbohydrate source

E.W. Magondu, H. Charo-Karisa, M.C.J. Verdegem, K. Nyakeya

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This study investigated the effects of manipulating carbon–nitrogen (C/N) ratio and fish stocking density on pond productivity: total heterotrophic bacteria counts, plankton biovolume and benthic macro-invertebrates. Labeo victorianus juveniles were reared for 72 days in 18 hapas suspended in six ponds measuring 150 m2 at densities of 10, 15 and 25 fish m-2. Fish in hapas received a locally formulated and prepared feed containing 295 g kg-1 crude protein, and ponds were treated with a C/N ratio of either 10 or 20. All treatments were carried out in triplicate. Increasing C/N ratio from 10 to 20 increased phytoplankton by 13% and zooplankton biovolume by 25% in the water column (P <0.001). Total benthic macro-invertebrates biovolumes were also 30% higher (P <0.05) with a C/N ratio of 20 compared to 10. Total heterotrophic bacteria counts increased both in water and sediment by 29% while net yield increased by 15% from 1534 (C/N 10) to 1821 (C/N 20) kg ha-1 72 day-1. C/N ratio of 20 and a stocking density of 25 fish m-2 led to the highest yield, survival, production and net benefits. It is suggested that polyculture may lead to better utilization of pond communities to further improve pond productivity
Original languageEnglish
Pages (from-to)942-951
JournalAquaculture Nutrition
Issue number6
Publication statusPublished - 2015

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