Growth performance, survival and profit index of 30-day post hatch Siganus guttatus (0.08 ± 0.09 g and 1.60 ± 0.15 cm) of the same age group was evaluated for 60 days in hapa net cages (1m wide x 1m long x 1m deep) in pond based conditions. Three stocking densities were replicated three times and laid out using Completely Randomized Design (CRD). The three treatments were: 1(T1)-250 fish m -3 ; 2 (T2)-500 fish m -3 and 3 (T3)-1000 fish m -3 . Growth performances (final weight, weight gain and specific growth rate) and survival rates of juveniles stocked in 250 fish m -3 was significantly higher (P < 0.05) than those fish stocked at 1000 fish m-3. However, growth performance and survival rates between 250 fish m -3 and 500 fish•m -3 were not significant. Feed conversion ratio (FCR) was significantly lower (P<0.05) in T1 than T3. However, FCR was not significant between fish stocked in T1 and T2. Net profit was higher in fish stocked in T2 compared with T1. Among the stocking densities of S. guttatus evaluated, 500 fish•m -3 appeared as the optimal stocking density based on growth, survival, FCR and profit index.
The supply of eggs and fry is one of the major constraints in the future development of aquaculture. Domestication of broodstock requires complete control of the reproductive biology for year-round spawning of the fish. Domestication of Siganus guttatus broodstock could alleviate broodstock shortages, enable selection of stock with desirable attributes, and allow continuous and sustainable production of juveniles. In this study, the reproductive potential of S. guttatus broodstock of different ages was assessed in terms of spawning frequency, fecundity, fertilization rate, number of larvae produced per spawning, and larval survival. Three age groups of siganid broostock were used in the study, namely, 5-6, 4-5 and 1-2 years old. The age of broodstock significantly affected spawning frequency and larval survival. No significant difference was observed among the different broodstock in terms of fecundity, fertilization rate, and number of larvae produced per spawning event.
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