Optimum Growth Performances of Mono-Sex Tilapia ( Oreochromis niloticus ) Fingerlings Through Different Stocking Density Under Semi-Intensive Farming System

摘要

Backgrounds and objectives: Commercially, stocking density can make a significant difference in fishFarming. Based on local environmental factors and management systems, monosex tilapia responses widely tovarious population density. For maximum production, determining optimum high density of Oreochromisniloticus was the soul target of present experiments. Materials and methods: Monosex tilapia were culturedunder semi-intensive farming system for 30 days with different stocking density to observe the response ofgrowth curve and production rate. Diets and fertilizations were maintained strictly through these puddles byintense monitoring. Results: Stocking density was 1000, 1200 and 1400 fries per decimal with 1.98 g averageinitial weight in three treatments. Fertilization rate and feeding frequency as well as feeding rate were constanti.e. 15-20% of fry’s bodyweight. Conditional factor (CF) was 2.41 in average with 4.28% growth rate and 3.75%specific growth rate. CF slowed down among first 7 days and was stable afterward. Average length and weightwere increased after 7 days. Average gross production was 153.45 kg/ha with highest production (231.87 kg/ha)in T2. Conclusion: Medium stocking density (T2) showed significant commercial growth and production ratesamong treatments rather lower (T1) or higher (T3) density under semi-intensive puddle management.