Small-scale fry production systems for Nile tilapia, Oreochromis niloticus (L.) |
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Authors: | G. C. MAIR C. C. ESTABILLO R. C. SEVILLEJA R. D. RECOMETA |
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Affiliation: | School of Biological Sciences, University of Swansea, Swansea, UK;Freshwater Aquaculture Center, Central Luzon State University, Nueva Ecija 3120, Philippines |
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Abstract: | Abstract Experiments were conducted to evaluate and compare the production, quality and survival of eggs and the subsequent growth and survival of fry in two small-scale production systems: natural incubation and egg collection followed by artificial incubation. Artificial incubation produced a significantly greater number and biomass of fry per unit weight of female broodstock (P < 0·05). This was due to the significantly decreased spawning interval in females from which eggs were collected (mean = 23· days) compared to naturally incubating females (mean = 36·8 days). It is also hypothesized that survival during artificial incubation (85%) is greater than in natural incubation. Cost-benefit analysis demonstrated a threefold increase in total net returns for artificial incubation. |
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