Green Global
Foundation   Journal
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GROWTH RESPONSE OF THREATENED Labeo calbasu (Hamilton) FINGERLING BASED ON STOCKING DENSITY IN PONDS (Pages : 1 - 8)

The research work was conducted to study the fingerling (large fry) production technique of threatened Labeo calbasu based on stocking in ponds for a period of 60 days from September, 2015 to October, 2015 in experimental ponds (mean area of 0.0020 hector and water depth of 1 m) under Department of Fisheries, University of Rajshahi, with three treatments each having three replicates. The stocking density was maintained at 34580 fishes/ha (T1), 39520 fishes/ha (T2) and 44460 fishes/ha (T3). The physico-chemical characteristics of pond water and growth parameters were measured fortnightly. Minimum and maximum values of water temperature, transparency, DO, pH, alkalinity and NH3-N were found 30.42±0.01oC (T2) and 30.49±0.01oC (T3); 32.76±0.08 cm (T1) and 36.01±0.08 cm (T3); 5.22±0.02 (T3) and 5.25±0.03 (T2) mg/l; 7.53±0.05 (T1) and 7.55±0.01 (T3); 112.30±1.97 (T3) and 119.49±0.25 (T1) mg/l; 0.015±0.002 (T1) and 0.020±0.001 (T3) mg/l , respectively among which only transparency and alkalinity were significantly varied with three different treatments. Significant difference was found for the mean values of growth parameters. The minimum value and maximum value of final weight, final length and SGR were 21.53±0.31 g (T3) and 30.33±0.25 g (T1); 10.46±0.25 cm (T3) and 14.33±0.25 cm (T1); 3.02±0.02% (T3) and 3.59±0.035% (T1), respectively. The highest survival rate of Labeo calbasu was 95.53±0.25 (T1) and the lowest was 82.57±0.40 (T3). The minimum and maximum net production (kg/ha) were found 634.79±3.16 (T3) and 881.0±2.46 (T1), respectively. The production of Labeo calbasu fingerlings were significantly (p<0.05) different among three treatments. The maximum and minimum CBR were 1.45±0.01 (T1) and 0.60±0.01 (T3), respectively. Treatment T1 was proved best in terms of production and economics of threatened Labeo calbasu fingerlings culture in ponds.Download