Effect of stocking density on the growth and survival of Tilapia juveniles (Sarotherodon melanotheron) reared in happas at Layo station (Dabou, Côte d’Ivoire)
Paper Details
Effect of stocking density on the growth and survival of Tilapia juveniles (Sarotherodon melanotheron) reared in happas at Layo station (Dabou, Côte d’Ivoire)
Abstract
A study was carried out to evaluate the effect of stocking density on the growth and survival of Sarotherodon melanotheron juveniles. To do this, 300 individuals with an initial average weight 4.13 ± 1.96 g and an initial average length 5.79 ± 0.89 cm were monitored for 42 days, in triplicate, at four densities (0.2; 0.4; 0.6 and 0.8 ind. /L) in happas of 50 liters volume. Fish were fed at 10% of their biomass with koudijs feed. A weekly sampling was carried out, during which ten (10) individuals were taken at random, they were weighed and measured individually. The physico-chemical parameters of water were measured daily. At the end of the experiment, the 0.8 ind. /L density gave the best growth results, with values of 16.27 ± 2.36g; 9.17 ± 0.92 cm; 0.29 ± 0.08 g/d ; 2.11 ± 0.08 and 443.67 ± 56.44 g, respectively for final average weight, final average length, ADG, condition factor and total biomass. For the survival rate, the highest value (95.00 ± 1.33%) was recorded in individuals with a density of 0.4 ind./L while those with a density of 0.8 ind./ L gave the lowest survival (80.00 ± 1.33%). Other densities could be tested and in other breeding structures to better appreciate the influence of this factor on the growth and survival of this species.
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