Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit-fish system in Rwanda

S. Rukera Tabaro, O. Mutanga, D. Rugege, J. C. Micha

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Although previous studies have suggested that rabbit excreta can be used as high-quality manure for sustaining plankton production due to their gradual nutrient release, integrated rabbit-fish production systems are still not widely used. Between 2006 and 2010 optimal rabbit densities for sustainable integrated rabbit-Nile tilapia farming were investigated at the Rwasave Fish Farming and Research Station, Rwanda, by assessing the effects of various rabbit densities on plankton type and abundance, fish production and pond water quality. Five treatments, using 200, 400, 800, 1 200 and 1 600 rabbits per hectare of pond, were tested over ponds in replicates. Physicochemical water parameters, plankton and fish growth were monitored on a daily and/or bi-weekly basis. Fish yield was positively correlated with rabbit density up to 1 200 rabbits ha-1 of pond, but at greater densities the yield began decreasing with increasing inorganic nitrogen, especially ammonia, and decreasing oxygen. Phytoplankton biomass, based on Chl a concentration, and daily primary productivity increased with increasing rabbit densities. Optimum density was in the range of 800 to 1 200 rabbits ha-1 of pond. A density of 1 200 rabbits ha-1 of pond gave the highest fish yield, 3.3 t ha-1 y-1 and the lowest ammonia level, and 800 gave the best environment for fish and plankton in terms of concentrations of Chl a and dissolved oxygen.

langue originaleAnglais
Pages (de - à)165-174
Nombre de pages10
journalAfrican Journal of Aquatic Science
Volume37
Numéro de publication2
Les DOIs
étatPublié - août 2012

Empreinte digitale

Siganus
Rwanda
fish ponds
Oreochromis niloticus
pond
rabbits
fish
plankton
fish production
ammonia
inorganic nitrogen
production system
manure
dissolved oxygen
fish culture
excreta
phytoplankton
water quality
animal manures
productivity

Citer ceci

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Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit-fish system in Rwanda. / Rukera Tabaro, S.; Mutanga, O.; Rugege, D.; Micha, J. C.

Dans: African Journal of Aquatic Science, Vol 37, Numéro 2, 08.2012, p. 165-174.

Résultats de recherche: Contribution à un journal/une revueArticle

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