Dr. A.H. M. Kohinoor
Senior Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute
P. Mandol
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute
S. Yeasmine
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute
M.M. Khan
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute
Growth, Stinging Cat fish, Stocking Densities, Earthen Pond
Modhupur, Tarakanda, Mymensingh
Animal Health and Management
The experiment was conducted for a period of 6 months from March to August 2010 in nine farmers ponds of 400-600 m2 area with a depth of 1.0-1.5m at Modhupur, Tarakanda, Mymensingh. Prior to stocking, ponds were dried and cleaned for weeds and unwanted aquatic animals. The dried ponds were left exposed to sunlight for several days and then limed at the rate of 250 kg/ha. Five days after liming, ponds were filled-up with deep tube well water up to the depth of 1 meter. After three days, ponds were fertilized with cowdung at the rate of 1,000 kg/ha. Three different stocking densities of shing (H. fossilis) were tested in the experiment. Each stocking density of shing was maintained as treatment and which replicated thrice. Fingerlings of shing were stocked at the rate of 1,25,000, 1,87,500 and 2,50,000/ha in T1, T2 and T3, respectively. Source of Fingerlings The fingerlings of H. fossilis were used in this experiment were produced in Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh. The sizes of fingerlings were 3.06±1.11, 3.44±0.96 and 3.24±1.0 in T1, T2 and T3, respectively. Fish stocking Fingerlings of shing (H. fossillis) were stocked in 01, March 2010 according to the experimental design. All ponds of various sizes were divided into three groups viz. group-1, group-2 and group-3. The ponds belongs to group-1, group-2 and group-3 were stocked with shing fingerlings at the stocking density of 1,25,000 (T1), 1,87,500 (T2) and 2,50,000/ha (T3), respectively. Post Stocking Management After stocking, in order to meet up the increasing dietary demand, commercial fish feed named Saudi Bangla Fish feed (starter-2 and 3) containing 35% crude protein were applied as supplementary feed at the rate of 4-10% of standing biomass of fish twice daily at 5:00 am and 7:00 pm. daily. Proximate composition of the feed was determined following the standard methods given by Association of Official Analytical Chemists in the Feed and Nutrition Laboratory of Freshwater Station, Bangladesh Fisheries Research institute, Mymensingh. The amount of feed was adjusted fortnightly on the basis of sampling of experimental fish. Besides this, lime was applied in all the ponds at the rate of 125 kg/ha at monthly interval. The fish were released again in the respective pond after recording weight. Water quality parameters such as water temperature, transparency, pH, dissolved oxygen (DO) and total alkalinity were determined at weekly interval between 0900 to 1000 hrs. Temperature was recorded using a Celsius Thermometer, dissolve oxygen and pH meter (Hanna pH 300) and a portable digital DO meter. Harvesting of fish At the end of the experiment, the fishes were harvested, first by seine netting and then by draining out of the ponds. The harvested fishes were counted and weight was recorded to find out the survival rate and production, respectively. Specific growth rate was estimated as: SGR (% bwd-1) = [In (final weight) – In (initial weight)]/culture period (days) x 100. Data were analysed using the statistical package, Statgraphics Version 7. ANOVA was performed on all the dependent variables to see whether the treatment had any significant effect or not.
Int. J. Agril. Res. Innov. & Tech. 2 (2): 9-14 December, 2012; ISSN: 2224-0616
Journal