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Arquivo Brasileiro de Medicina Veterinária e Zootecnia
On-line version ISSN 1678-4162
SOUSA, R.M.R. et al. Productive performance of Nile tilapia (Oreochromis niloticus) fed at different frequencies and periods with automatic dispenser . Arq. Bras. Med. Vet. Zootec. [online]. 2012, vol.64, n.1, pp.192-197. ISSN 1678-4162. http://dx.doi.org/10.1590/S0102-09352012000100027.
The performance of Nile tilapia (Oreochromis niloticus) raised in cages furnished with an automatic dispenser, supplied at different frequencies (once per hour and once every two hours) and periods (daytime, nighttime and both) was evaluated. Eighteen 1.0m3 cages were placed into a 2000m2 pond, two meters deep with a 5% water exchange. One hundred and seventy tilapias, with initial weight of 16.0±4.9g, were dispersed into each 1m3 cage and the feed ration was adjusted every 21 days with biometry. Data was collected from March to July (autumn and winter). Significant difference to final weight (P<0.05) among treatments was observed. The increase in feeding frequency improves the productive performance of Nile tilapias in cages and permitted better management of the food. The better feed conversion rate for high feeding frequency (24 times day-1) can result in saving up to 360kg of food for each ton of fish produced, increasing the economic sustenance for tilapia culture and suggesting less environmental pollution.
Keywords : fish; automatic feeding; cage; feed management.