Abstract
The mixed culture study of pabda (Ompok pabda) and gulsha (Mystus cavasius) with monosex tilapia (Oreochromis niloticus) was undertaken to assess the growth and production potentials under on-farm condition during March to August 2021 at Patuakhali Science and Technology University. Three stocking densities of pabda and gulsha were tested keeping the monosex male tilapia constant stocking density. Each stocking density of pabda and gulsha was considered as treatment (T) with three replications. Fingerlings of pabda, gulsha and monosex tilapia were stocked at the rate of 150, 200 and 100 per decimal in T1, 200, 250 and 100 per decimal in T2 and 250,300,100 per decimal in T3. Formulated protein (30%) enriched floating feed was given twice daily (10.00 am and 5.00 pm) at the rate of 10% body weight throughout the entire culture periods. Water quality analysis showed that the mean values of water temperature, pH and dissolve oxygen were not significantly different among the treatments existing within cultivable ranges. Water transparency was found significantly different (P<0.05) among the treatments. The correlation matrix analysis among stocking density, survival, FCR and production gave a clear picture where stocking density showed negative correlation with survival while survival indicated positive correlation with production. After six months of rearing, the estimated gross productions were 11,441±45.93 kg/ha/6months, 10,972±44.81 kg/ha/6months and 10646±51.72 kg/ha/6months from T1, T2 and T3, respectively. The FCR were found to be 2.12, 2.43 and 2.56 in T1, T2 and T3 .Analysis of variance of total production showed significant difference (p<0.05) among the treatments with higher production in T1 and lower in T3. A simple economic analysis revealed that higher benefit cost ratio (BCR) and net profit was obtained in treatment T1 (BCR -2.16, net profit: Tk.18,03,525/ha/6 months) followed by treatment T2 (BCR -1.83, net profit: Tk.14,17,910/ha/6months) and ...........
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