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Growth and Production Performance of Indigenous Threatened Cat Fish, Clarias Batrachus (linn. 1758) Based on Stocking Density in North-western Bangladesh

Md. Abdus Samad
Associate Professor, Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

AM Imteazzaman
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to assess the suitable stocking density of walking cat fish (Clarias batrachus Linn. 1758) for 90 days in nine earthen ponds situated at the hatchery complex, Department of Fisheries, University of Rajshahi. Each trial has three treatments. The fingerlings were stocked at 61750, 49400 and 37050 individual/ha in T1, T2and T3, respectively. The initial weight of fingerlings was 9.2±0.05g. The diets and feeding rates were same for all treatments. The net weight gain, SGR% and survival rate were found 21.78±0.15, 1.34±0.01 and 89.75±2.40% in T1, 28.65±0.09, 1.57±0.02 and 90±1.58% in T2and 29.14±0.25, 1.58±0.01 and 92±2.41%, respectively in T3, which were significantly (P>0.05) different among the treatments except for survival performance. The highest net production was recorded from T2(1786.28 kg/ha) where the stocking densities were 49400 individuals/ ha-1, and the significantly lowest net production in T3(1498.2), due to low stocking densities. The net profit (Tk./ha/90 days) was significantly higher (P<0.05) in T2 (337535). Water quality parameters such as temperature (⁰C), transparency (cm), pH, dissolved oxygen (mg l^-1) and NH3-N (mg l-¹) were monitored fortnightly. Mean values of the water quality parameters showed no significant differences (P>0.05) among the treatments in two trials except NH3-N in trial one. The cost and benefit ratio were significantly highest (P<0.05) in T3(1:1.05) and lowest in T1(1:0.67). Present findings indicated that the production and net profit was significantly higher with treatment T2(49400 individuals/ha).

Keywords: Growth, Stocking density, Indigenous, Clarias batrachus

Location: North Western Bangladesh

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

This study was conducted to determine the optimum stocking size and density of C. batrachus based on growth, survival and biomass gain.

Methodology:

2.1Study location and Pond facilities: The experiment was performed in six earthen ponds of 45-48m2 in the hatchery complex, Department of Fisheries, the University of Rajshahi for a period of 90days.The ponds were similar in shape, depth, basin configuration including water supply facilities. The water depth was maintained around 1.2-1.5 m. 2.2.Experimental design: The experiment was conducted in a completely randomized design with two trial groups each having three treatments namely T1, T2, T3, with three replications. The additional feed (commercial pellet feed; 27% protein level) provided to the fishes was the same in the first trial for each treatment, variation only in stocking density. On the other hand; stocking density of Claritas batrachus in the second trial for each treatment was the same. Layout of the experiment 1st trial TreatmentsT1: 61,750 Individuals /ha^-1(6 Individuals /m²)T2: 49,400 Individuals / ha^-¹ (5 Individuals /m²)T3: 37,050 Individuals / ha^-¹ (4 Individuals /m²) After the completion of 90 days the fish was harvested and the result was analyzed. 2.3 Pond Preparation: All undesirable fish were completely eradicated by applying rotenone at a rate of 2.5 g m^-3. Aquatic weeds were removed manually. Lime (Calcium carbonate) was applied at the rate of 300 g ha^-¹ after one week of rotenone application. Lime was liquefied into an aluminum bucket and then applied by spreading homogeneously in the ponds. Ponds were fertilized with urea and triple super phosphate (TSP) each at a rate of 25 kg ha^-¹ and cowdung at a rateof 1000 kg ha^-¹ after three days of liming. TSP was applied after dissolving in plastic buckets for 10 to 12 hours before application. Fertilizers were applied by spreading methods. 2.4 Collection of fishes: The Fingerlings of C. batrachus were collected from a private hatchery of the Madhupur Upazila of Tangail district in Bangladesh. The average weights of the fingerlings were 9.20±1.68 g Fingerlings were brought to the experimental site through plastic barrels with proper aeration. 2.5 Fry Stocking: Fingerlings were stocked at61,750,49,400, 37,050 Individuals/ha^-¹ respectively. The fingerlings were transferred into plastic bucket and released into the experimental pond. The length and weight of around 10% of all fingerlings of each pond were measured and recorded for estimating initial stocking biomass and to adjust the initial feeding rate for fishes. 2.6 Feeding of fishes: For the first trial the fishes were fed with homemade pellet feed (containing 27% crude protein) daily at a rate of 10% of body weight for 1^st month, 8% of body weight for 2^ndmonth and 6% of body weight for 3^rd month. Half of the required feed for a day was supplied in the morning and rest half in the afternoon. The inclusion rate and proximate composition of feed ingredients and experimental diets were analyzed according to the methods given in association of official analytical chemists 2.13 Statistical analysis: For the statistical analysis of data collected, one-way analysis of variance (ANOVA) was performed using the SPSS (Statistical Package for Social Science, evaluation version-15.0). Significance was assigned at the 0.05% level. 2.14. Economics analysis: A simple economic analysis was done to estimate the economic return in each treatment. The total cost of inputs was calculated and the economic return was determined by the differences between the total return (from the current market prices) and the total input cost. The cost in taka per unit yield (CPY) was calculated and was expressed as the cost in Tk/kg of fishes produced.

Source of Information: International Journal of Fisheries and Aquatic Studies 2019; 7(5): 267-274

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

An experiment was carried out to evaluate the growth survival and production of C. batrachus on different stocking densities of C. batrachus for a period of three months in earthen ponds with three treatment groups each with three replications. Therefore, on the basis of growth performance, production of fishes and profitability of culture system, it can be concluded that the stocking density at 49400 individuals/ h-1might is recommended as the best density for the culture of air-breathing walking catfish in the northwestern region. The unutilized seasonal small ponds in different areas of Bangladesh can be used for culturing this threatened species, which will ultimately change the livelihood of the rural people.

Knowledge Management: Journal