Effect of Stock Density and Ploidy in Jundia,Rhamdia quelen,Larvae Performance |
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| Authors: | Hirla Fukushima Jhon Edison Jimenez Marcos Weingartner |
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| Institution: | 1. Aquaculture Graduate Program, Federal University of Santa Catarina , Florianopolis, Brazil;2. Freshwater Fish Biology and Fish Culture Laboratory, Aquaculture Department, Federal University of Santa Catarina , Florianopolis, Brazil |
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| Abstract: | The performance (growth and survival) of diploid and triploid jundia, Rhamdia quelen, was evaluated at six different stocking densities (10, 60, 110, 160, 210, 260 larvae/liter) during 31 days after rearing in an intensive larviculture system. Triploid fish exhibited a significantly higher survival rate than diploids at all stocking densities (27.1 ± 4.3% vs. 12.1 ± 3.3%; P < 0.01). Survival was not affected by stocking density (P > 0.05). Length gain was not affected by either ploidy or stocking density. Diploid fish gained more weight than triploids (P < 0.05), though this difference could result from lower fish densities in diploid treatments resulting from the higher mortality rate of diploid fish. This hypothesis is strengthened by the higher biomass present in triploid treatments (P < 0.01). |
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| Keywords: | larviculture rearing triploidy performance stocking density |
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