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Optimization of Stocking Density for Environmental FRIendly Improved Extensive Shrimp Farming System in South-west Part of Bangladesh

P.K. Roy
Bangladesh Fisheries Research Institute, Brackishwater Station, Khulna 9280, Bangladesh

S.U. Ahmed
Bangladesh Fisheries Research Institute, Brackishwater Station, Khulna 9280, Bangladesh

A.F.M. Shofiquzzoha
Bangladesh Fisheries Research Institute, Brackishwater Station, Khulna 9280, Bangladesh

Abstract/ Executive Summary:

An experimental culture practice of P. monodon on extension approach was conducted in two brackishwater earthen ponds of Demonstration Farm and Training Center (DFTC), Kaliganj, Satkhira. The experiment was aimed to provide farmers with appropriate technology that can immediately improve pond yield with keeping the environment in friendly condition. For optimization of stocking density of a cost effective environmental friendly improved extensive shrimp farming, the ponds were stocked with coastal river post larvae of P. monodon at the stocking rates of 2 pls/m² and 2.5 pls/m² without supplementary feeding. To control experimental error another five farmer's gher were used as replicates of each demo-pond. Considering the farmers buying ability, Cost of inputs and other facilities kept minimal. The impact of stocking density was evaluated on the basis of growth, survival rate, production and economic return. Better production (average 299.01 kg/ha) with same survival rate (39.33%) were found with a stocking density of 2.5 pls/m² without causing any deterioration in the culture environment.

Keywords: P. monodon, Shrimp farming, Stocking density

Location: Kaliganj, Satkhira

Start Date: 00-04-1996

End Date: 00-08-1996

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

To develop an optimum stocking rate with environmentally friendly improved extensive shrimp farming (in South-west part of Bangladesh) techniques.

Methodology:

Experimental site - Two ponds each of 1.25 ha was selected for this experiment in the demonstration shrimp farm qnd training center complex of the DOF at Kaligonj, Satkhira. Ten local farmer's gher more or less similar nature also selected for farmers contact as well as replicates of demo-pond. Experimental procedure- The experiment was conducted during the month of April to August'96. There were two treatments with six replicates each. In T₁, pond was stocked with a rate of 2pls/m² and for T₂ it was 2.5pls/m².Five farmer's gher were used as replicates for each treatment. No feed were supplemented dnring the culture operation. Pond preparation - The ponds bottom were dried and tilt by tractor. Soil pH were tested and lime were added depending on the soil pH. Flushing gates were fenced using bamboo slits and nylon mesh screen. Water was introduced gradually at a minimum depth to facilitate the soil and lime interaction. Cowdung at the rate of 500kg/ha, mustard oil cake 100 kg/ha and phosphate+ urea 35 kg/ha (P:U = 3:1) were applied followed by addition of water up to a depth of 30~40 cm and wait for natural feed development. Stocking - Two ponds were stocked with locally available seed at the density of 2 pl/m² and 2.5 pls/m respectively. Water exchange and fertilization - In all the ponds water exchanged fortnightly during new moon and full moon. Inorganic fertilizer (urea and phosphate) were applied during the experimental period, depending on the availability ot natural feed. To avoid sudden changes of temperature, salinity, pH, dissolved oxygen etc. due to heat and rainfall, effort were made to maintain an ideal water depth of l.Om in grow-out ponds and in the ghers. Data collection - Water quality parameters were measured every day using appropriate methods. Sampling for growth study were done fortnightly basis. Harvesting and data analysis - After attaining marketable size shrimp were harvested by total weight were recorded. Comparison of treatment mean were carried out using one-way analysis of variance followed by testing pair-wise difference using Duncan's Multiple Range Test to determine differences in means (P<0.05). Economic evaluation- An economic analysis was performed Production cost and gross benefit were estimated on the basis of whole sale market price of shrimp and inputs during the experimental period.

Source of Information: Bangladesh J. Fish. Res., 3(2): 137-143, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Better production (average 299.01 kg/ha) with same survival rate (39.33%) were found with a stocking density of 2.5 pls/m² without causing any deterioration in the culture environment.

Knowledge Management: Journal