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Influence of Stocking Density on Growth Performance of Labeo Batain Cage at River Padma, Rajshahi, Bangladesh

Naznin Nahar
Department of Fisheries, University of Rajshahi, Bangladesh.

Sadia Afrin
Department of Fisheries, University of Rajshahi, Bangladesh.

Md. Istiaque Hossain
Department of Fisheries, University of Rajshahi, Bangladesh.

Md. Abdus Samad
Department of Fisheries, University of Rajshahi, Bangladesh.

Farhabun Binte Farhad
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Mohammad Lutfar Rahman
Department of Genetics and Fish Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

Abstract/ Executive Summary:

As a result of climate change, aquaculturists are seeking adaptive culture techniques for sustainable aquaculture. In this case, cage culture is a suitable technique that can mitigate the challenge of climate change, but due to the lack of knowledge of proper stocking density, often productions are not satisfactory. Therefore, the experiment was conducted to evaluate the influence of stocking density on the growth and production of an endangered minor carp bata (Labeo bata) in cages for a period of 120 days in Padma River, Rajshahi, Bangladesh. On average initial weight of bata fingerling of 5 g was stoked in cages under three treatments each containing three replications using three different stocking densities (106, 71, and 35 fingerling/m³for T₁, T_2, and T₃, respectively). Supplementary feed (3% per body weight) was given to the cultured species twice a day. The mean values of water temperature, transparency, pH, and dissolved oxygen were in a suitable range throughout the experimental period. Significantly (p<0.05) highest mean gross weight (85.82±0.70 g), specific growth rate (2.37± 0.02%), survival rate (83± 3.00%), and food conversion ratio (2.27± 0.03) was found in T₃ rather than T₂ and T₁. The net production in terms of biomass (18.23±2.43 kg/cage) was significantly (p<0.05) higher in T₂. The study suggests that treatment T₂ (71 fingerlings/m³) is the optimum stocking density to produce maximum production by cage culture of Labeo bata.

Keywords: Cage culture; Stocking density; Endangered species; Growth; Production.

Location: Padma River at Jahajghat, Motihar Thana of Rajshahi City, Bangladesh

Start Date: 00-07-2017

End Date: 00-10-2017

Program Area: Animal Health and Management

Commodity: Bata

Objectives:

The present study is the first report on cage culture of L. bata in rivers and these findings of the experiment would suggest proper instructions for optimizing stocking density of bata in rivers of Bangladesh.

Methodology:

The study was conducted in Padma River at Jahajghat, Motihar Thana of Rajshahi City, Bangladesh in nine cages of equal size (2.45×1.52×1.52 = 5.66 m³) for a period of four-month (120 days) from July to October 2017. Three different stocking densities were used in the experiment to observe its effects on the growth, survival and production of L. bata. The framework of rectangular-shaped cages was made of bamboo sticks and covered by a high-density nylon net. The equal mesh size of the net was used about 1 mm. The fish fingerlings were collected from fish seed farms in the local area, Meherchandi, Rajshahi. The mean initial weight of the fish was 5g. Prior to release, fingerlings were acclimatized to the new environment in a floating cage for several hours. Then 600,400 and 200 fingerlings of Labeo bata were stocked in treatment I (cage - 1,2,3), treatment II (cage - 4,5,6), and treatment III (cage - 7,8,9), respectively. For encouraging the growth of Labeo bata, supplementary feed (Wheat bran 60% + mustard oil cake 30% + rice bran 10%) was supplied to fish at the rate of 3% of fish body weight. Supplemental feed was administered twice a day, in the morning and afternoon. The water quality parameter such as temperature (°C), Transparency (cm), pH, and dissolved oxygen (mg/l) were recorded fortnightly throughout the culture period. Water temperature was recorded by a Celsius thermometer. Transparency was measured by using a Secchi disc of 40 cm in diameter, pH was recorded by using portable pH paper, HACH kit (HACH, Loveland, CO, USA) was used to determine dissolved oxygen of water. The body weight (g) and length (cm) of fishes were measured after randomly collecting 20 fish samples from each cage at every 15 days interval. Growth performance of the fish was estimated in terms of the following parameters- Weight gain (g) = Average final weight (g) – Average initial weight (g); Length gain (cm) = Average final Length (cm) – Average initial Length (cm). Specific growth rate (SGR, % bwd^-1) Specific growth rate (SGR, % bwd^-1) was calculated as- [Ln (final weight) – Ln (initial weight)] / culture period (day) x 100. After completing the experiment of 120 days the number of total live fingerlings in the cage was counted separately for calculation of survival rate using the following formula- Survival rate (%) = (Number of fish live / Number of fish used) x 100. Feed Conversion Ratio (FCR) = Amount of feed given (kg) / Fish weight gain (kg). After completion of the experimental period, all fishes were caught by fishermen and sold at the nearby fish market at a prevailing price. Experiment operating costs like infrastructure preparation cost, feed, fingerlings were adjusted from the sale of fish. Then a benefit-cost ratio (BCR) and economic analysis were done to determine the profitability of bata culture in cages. Benefit-cost ratio (BCR)= Benefit ÷ Total cost. All the data were subjected to ANOVA (Analysis of Variance) using SPSS software (Statistical Package for Social Science) version-20. The mean values were also compared to see the significant difference from the DMRT (Duncan Multiple Range Test p< 0.05 level of significance). The regression procedure of MS Excel 2010 was used to establish a relationship between specific growth rate and stocking density. Results are stated as mean ± standard error (SE).

Source of Information: Asian Journal of Fisheries and Aquatic Research- 11(4): 1-11, 2021

Article Link (Online Journal): DOI: 10.9734/AJFAR/2021/v11i430208

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, cage farming of Labeo bata at different stocking densities has revealed that stocking density is negatively correlated along with growth, although the most suitable stocking density is selected according to the cost-benefit ratio. From this experiment, it could be concluded that stocking density of T₂ (71 fish/m³) is advisable and most suitable rather than the lowest and highest stocking density for successful cage culture farming of Labeo bata.

Knowledge Management: Journal