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Effects of Stocking Density on Growth and Production of Gift (oreochromis Niloticus)

S. J. Hasan
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

S. Mian
Department of Fisheries Biology and Genetics, Sylhct Agriculrural University, Sylhet.

A. H. A Rashid
Department of Aquatic Resources Management, Sylhct Agriculrural University, Sylhet.

S. M. Rahmatullah
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

The study was carried out to assess the effects of stocking density on growth and production of GIFT for a period of 100 days. Three stocking densities were used 150, 200 and 250 fish decimal: designated as treatment T₁, T₂ and T₃, respectively having two replicates for each. Commercial pellet reeds were fed at the rate of 30%/b body weight up to first 10 days and then gradually it was readjusted to 22%, 18%, 15%, 12%, 10%, 8%, 6%, 5% and 4% respectively after every 10 days interval. The result showed that the fish in the treatment T₁ stocked with the lowest stocking density (150 fish/doc) resulted in best individual weight gain (148.65g) followed by those in treatment T₂ and T₃, respectively. The specific growth rates (SGR) at every 10 days were ranged from 6.59 to 1.11 in different treatments during the experimental period. The food conversion ratio (FCR) values ranged between 1.82 to 2.03 with treatment T₁ showing the lowest FCR. The survival rate ranged between 84 to 92 %. Treatment T₁ and treatment T₂, showed significantly higher survival than Treatment T₃,. The fish production rate in treatment T₁, T₂ and T₃ were 18.58, 23.87 and 26.n kg/decimal respectively.

Keywords: GIFT, Stocking density, Growth and production

Location: Mymensingh

Start Date: 00-02-2007

End Date: 00-05-2007

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

To study the effect of stocking density or GIFT tilapia culture under the same feed and management conditions.

Methodology:

The experiment was carried out for a period of 100 days during February to May, 2007 in six selected experimental ponds of "Nagla Fisheries Ltd.," Haluaghat, ,Mymensingh. The size of each pond was 80 decimal and the ponds were indicated by the numbers 1, 4, 2, 5, 3, 6 respectively. The ponds were similar in respect of depth, basin configuration and pattern including water supply facilities. The water depth was maintained at a maximum of 1.2 m. There was well organized inlet and outlet system to maintain suitable water level. The ponds were surrounded by Cine meshed nylon nets to prevent entering or frogs and fish eating animals. Water quality was maintained properly through exchange of water during the experimental period. The ponds were selected randomly. After draining out of water, the ponds were fully dried and subsequently crushed limestone was spread on the pond bottom. After 3 days ponds were filled with water from deep tube-well and then cow-dung was applied phytoplankton production. The water depth was maintained at around 1.2 meter throughout the experiment. Fish were stocked after one week of fertilization, The GIFT tilapia fries were collected from the Reliance Hatchery, Trishal, Mymensingh and transported to the farm in oxygenated polythene bags covered by jute bags. The fries were released to the culture ponds after sufficient acclimatization, Locally available commercial pellet feeds named "Quality feeds" was selected for the experiment. This pellet reed was examined and used due to having appreciable stability in water and nutritive value within the normal range. At the beginning of the experiment feed was supplied at the rate of 30% of the body weight of reared GIFT and gradually it was readjusted to 22%, 18%, 15%, 12%, 10%, 8%, 6%, 5% and 4% respectively after every 10 days interval. They were fed four times daily up to 30 days, then three times daily up to 70 days and then twice daily up to the end of the experiment. Water temperature, pH, dissolved oxygen (DO), transparency (cm) and total alkalinity were recorded at 10 days interval between 9.00 A.M. and 11.30 A.M. using a digital meter. Secchi disc was used to measure the transparency (cm) or the water. Total alkalinity was measured by Acid titration method. Statistical analysis of data had been done to see whether the influence of different treatments (stocking densities) on the growth (weight) and production or fishes were significant or not. One way analysis of variance (ANOVA) was done to test the significance of difference among different treatment means. Significant differences among different treatment means were identified by Duncan's New Multiple Range Test (DMRT). A simple economic analysis was done to estimate the net profit from different treatments. The cost of leasing of the ponds was not included in total cost. An additional 7.5% on total cost was included as operational cost.

Source of Information: Bangladesh Journal of Fisheries Research, Vol- 14(1-2), June-Dec. 2010, ISSN:1026-6690.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result showed that the fish in the treatment T₁ stocked with the lowest stocking density (150 fish/doc) resulted in best individual weight gain (148.65g) followed by those in treatment T₂ and T₃, respectively. The specific growth rates (SGR) at every 10 days were ranged from 6.59 to 1.11 in different treatments during the experimental period. The food conversion ratio (FCR) values ranged between 1.82 to 2.03 with treatment T₁ showing the lowest FCR. The survival rate ranged between 84 to 92 %. Treatment T₁ and treatment T₂, showed significantly higher survival than Treatment T₃,. The fish production rate in treatment T₁, T₂ and T₃ were 18.58, 23.87 and 26.n kg/decimal respectively. The results of the present study indicated that a stocking density of 150 fish/decimal is optimum for GIFT tilapia culture with formulated feed.

Knowledge Management: Journal