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Scaling Up of Stocking Density of Tiger Shrimp (penaeus Monodon) Under Improved Farming System in Khulna Region of Bangladesh

M. I. Hossain
Gazi Fish Culture Ltd, Koilashgong, Khulna, Bangladesh.

A. M. Shahabuddin
Department of Fisheries, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.

M. A. B. Bhuyain
Institute of Marine Sciences and Fisheries, University of Chittagong, Bangladesh.

M. A. Mannan
Department of Fisheries Management, Bangladesh Agricultural University, Bangladesh.

M. N. D. Khan
Graduate School of Bioresources, Mie University, Mie Prefecture, 514-8507, Japan.

R. Ahmed
Department of Fisheries, Ministry of Fisheries and Livestock, Dhaka, Bangladesh.

Abstract/ Executive Summary:

Scaling up of stocking density of black tiger shrimp (Penaeus monodon) under improved shrimp farming system in the Khulna region of Bangladesh. Completely randomized design (CRD) with three treatments each with three replicates. In the farm station of Gazi fish culture ltd. at Koilashgong, Khulna, Bangladesh between March to June 2011. Nine ponds were selected and all ponds were prepared according to the general pond preparation system. Polymerase chain reaction (PCR) tested post larvae (PL₁₅) were stocked at three different stocking densities i.e. 8 pcs/m² (T₁), 15 pcs/m² (T₂) and 22 pcs/m² (T₃). Commercial shrimp feed were supplied to all the treatments. Feed were adjusted according to the body weight gain of shrimp. Probiotics were applied in all the treatments to prevent diseases and maintain water quality parameters. Monthly water samples were collected for analysis and growth parameters were measured. Results showed that all the water quality parameters were within the optimum range. Highest survival was found in T₂ (82±4) and lowest was recorded in T₃ (68±2) (P<0.05). Harvesting size of shrimp varied from 29.0±1.53 g to 38.5±0.5 g. Harvesting size was smaller in T₃ than in T₁and T₂ (P<0.05). Stocking density of 15 and 22 pcs/m²exhibited the highest production of 4635.1±128 kg/ha/crop and 4328.7±138.2 kg/ha/crop respectively whereas, T₁ showed lowest (2431.3±35.2 kg/ha/crop). It was observed that two crops can be found from each pond/year. Net profit calculation showed that highest net profit was found in T₂ compared to other treatments (P>0.05). The research showed that stocking density of tiger shrimp 15 pcs/m² is the optimum density for improved shrimp farming system in Khulna region of Bangladesh.

Keywords: Stocking density; Culture system; Tiger shrimp; Penaeus monodon

Location: Koilashgong, Khulna, Bangladesh.

Start Date: 00-03-2011

End Date: 00-07-2011

Program Area: Resource Development and Management

Commodity: Shrimp

Objectives:

To study the scaling up of stocking density of black tiger shrimp (P. monodon) under improved shrimp farming system in Khulna region of Bangladesh.

Methodology:

The experiment was carried out in the farm station of Gazi fish culture ltd. at Koilashgong, Dakop upazilla of Khulan, Bangladesh from March to July 2011. Nine ponds were selected for three treatments with three replications. All ponds were prepared according to the general pond preparation system. Black soil of the pond was eliminated and pond bottom was allowed to sun dry. The average pH was calculated and required amount of lime was applied to maintain the optimum pH. The ponds were fenced by net to prevent entering other species. PCR tested post larvae at 15 days old (PL₁₅) average weight 0.05g were stocked in each pond maintaining three different stocking densities i.e. 8 pcs/m² in Treatment 1 (T₁), 15 pcs/m² in Treatment 2 (T₂) and 22 pcs/m² in Treatment 3 (T₃). The experiment was set up according to the completely randomized design (CRD) protocol. Ponds were filled with water by filtration with small mesh size filter net. The initial water levels in the ponds were maintained at 60 cm level. After filling the pond, crab net was fixed along the pond perimeter. Ponds were bleached with bleach containing 30% chlorine at the rate of 60 ppm. Inorganic fertilizers were applied weekly for producing natural food in the culture ponds at a rate of 28 kg N/ha/week and 7 kg P/ha/week. Different types of chemicals and minerals such as dolomite, sodamix, nutrilake and A-soil were applied to the pond in the three days interval during the pond preparation. After three weeks the ponds were ready for stocking and the seeds were acclimatized to the pond environment. After acclimatization seeds were released slowly to the ponds water. Commercial shrimp feed were applied in all the treatments. Blind feeding was done for first 30 days. Later the feeding was adjusted based on the check tray observation and body weight sampling. Four check trays were installed in each pond for monitoring the shrimp health conditions and feed intake. The feed ration was divided into 4 times a day as 25%, 20%, 30% and 25% in the morning at 6.00 a.m., 11.00 a.m., 6.00 p.m. and 10.00 p.m. respectively. The ingredients of the feed include Fish meal, Cod liver oil, Shrimp/prawn meal, Squid meal, Wheat flour, Binder, Soybean meal, Broken rice, Phospholipid, Cholosterol, Vitamins and Minerals, Di calcium phosphate etc. Additional water exchange was not done for the first 60 days. After that 12 cm of water was added regularly in every 15 days interval till harvesting and water level was maintained around one meter in all the ponds. Commercial probiotics were collected from local market. Based on the water quality parameters and health conditions of shrimp, probiotics were applied in all the treatments during the culture period. Sampling was done in the pond every week during early hours of the day with cast net for checking the healthiness and growth rates. The water quality parameters of the culture pond were regularly monitored. Monthly water sample were collected for analysis. The water level was measured by using a handmade wooden scale with cm marking. The water salinity of the pond was measured by using a hand refrectometer (Erma-Japan). The pH, alkalinity, total ammonia nitrogen (TAN) of the pond water was recorded by using pH test kit, alkalinity kit and ammonia test kit respectively (Advance Pharma, Thailand). Water temperature was measured by using a standard centigrade thermometer. The dissolved oxygen (DO) was estimated by DO test kit (Advance Pharma, Thailand). Transparency was observed in terms of light penetration by using Secchi disc. Economic analysis was done considering all variable costs to the expenditure and respective shrimp sales of the treatment to the gross return. One way ANOVA was done to observe the differences in growth, survival rate, production, FCR values and economic return among different treatments.

Source of Information: American Journal of Experimental Agriculture, 3(4): 839-848, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The research showed that stocking density of tiger shrimp 15 pcs/m² is the optimum density for improved shrimp farming system in Khulna region of Bangladesh.

Knowledge Management: Journal