Malays. Appl. Biol. (2008) 37(1): 47–56
GROWTH, SURVIVAL AND PRODUCTION OF A THREATENED SILURID CATFISH, OMPOK PABDA (HAMILTON) FINGERLINGS IN NURSERY PONDS
AMINUR RAHMAN, M.*, YEASMINE, S. and KHAN, M.M.
Smithsonian Tropical Research Institute, Box 0843-03092, Naos Island, Balboa, The Republic of Panama.
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ABSTRACT
The growth and survival of 12-day old fry of Ompok pabda were studied for 8 weeks in nine earthen nursery ponds having an area of 1.0 decimal (0.012 ha) with an average water depth of 0.8 m each. Three stocking densities were tested with three replications for each, viz., 200,000/ha as treatment-1 (T1), 250,000/ha, as treatment-2 (T2) and 300,000/ha as treatment-3 (T3). At stocking, all fry were of the same age group with a mean length and weight of 1.3 cm and 0.1 g, respectively. Fry in all the experimental ponds were supplemented with SABINCO commercial nursery feed (32.1% crude protein) for the first 28 days and starter-I feed (31.5% crude protein) for days 15 to 56. The rate of feeding was 14% of the estimated body weight of fry for the first two weeks, 12% for the second two weeks, 10% for the third two weeks and 8% for the fourth two weeks. The physico-chemical parameters and plankton populations of pond water were within the suitable level for fish culture. Growth performances (final weight, final length, weight gain, length gain and specific growth rate) and survival of fingerlings in T1 were significantly higher (P < 0.05) than those in T2 and T3, respectively. Feed conversion rate was significantly lowest in T1 followed by T2 and the highest in T3. Significantly higher number of fingerlings was produced in T3 than those in T2 and T1. Despite this, consistently higher net benefits were obtained from T1 than those from T2 and T3. Overall, highest growth, survival, production and benefits were obtained from T1 where stocking density of fry was 200,000/ha. Hence, of the treatments evaluated, stocking density of 200,000 fry/ha appears to be the most suitable stocking density for rearing of pabda fingerlings in nursery ponds.
Key words: Ompok pabda, fry, stocking density, fingerling, growth, survival, production, benefit
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