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Performance of Genetically Improved Farmed Tilapia (gift) Under Mono and Mixed Culture with Silver Barb (barbodes Gonionotus) in South-west Bangladesh

M.M.R. Shah
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh

M. Younus Mia
Department of Environmental Science & Resource lvianagement,Mawlana Bhashani Science & Technology University, Santosh, Tangail 1902, Bangladesh

M.J. Alam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh

Abstract/ Executive Summary:

A participatory on-farm trial was carried out to evaluate the production performance of GIFT (genetically improved farmed tilapia) strain of Oreochromis sp., either alone or with silver barb (Barbodes gonionotus), in six rain-fed freshwater ponds of coastal area. There were two treatments; (i) GIFT alone at a stocking density of 24,700/ha (T1) and (ii) 1:1 combination of GIFT and silver barb (T2). Each of the treatments had three replications. A significantly (p<0.05) higher production of 4306.14 kg/ha of GIFT was obtained in monoculture, compared to the total production of 3480.38 kg/ha of GIFT and silver barb. In the 1:1 combination treatment, the production of GIFT (2036.06 kg/ha) was also higher than that of silver barb (1444.32 kg/ha). The results reveal that GIFT monoculture can perform better in rain-fed seasonal freshwater ponds of southwest coastal areas.

Keywords: GIFT, Silver barb, Coastal freshwater ponds, Tilapia, Monoculture

Location: Paikgacha Upazilla, Khulna

Start Date: 00-00-2006

End Date: 00-00-2006

Program Area: Farming System

Commodity: Tilapia

Objectives:

To evaluate the performance of GIFT under mono and mixed culture with silver barb in the rain-fed seasonal ponds in coastal areas of Bangladesh.

Methodology:

Pond preparation: Six rain-fed freshwater ponds of various sizes (155-410 m², average depth 1.5 m) were selected in Gopalpur, Saral and Bandikati villages of Paikgacha Upazilla, Khulna for this study for the duration of April to September. Ponds were prepared by application of lime to @ 250 kg/ha filling up with nearby freshwater sources and rain water. Three days after application of lime, ponds were fertilized with cattle manure @ 750 kg/ha. Inorganic fertilizers - urea @ 25 kg/ha and TSP @ 30 kg/ha were applied after five days of applying organic fertilizer. Stocking & management: After three days of fertilization, when water became greenish, three ponds were stocked with only GIFT (24,700 nos./ha) (Treatment-1) and other three ponds were stoked with GIFT (12,350 nos./ha) + Silver barb (12,350 nos./ha) (Treatment-2). The average body weight of the stocked GIFT and silver barb was 0.37g and 3.79g, respectively. Fishes were fed with rice bran at the rate of 5-3% of the total biomass. After stocking, ponds were fertilized with urea and TSP @ half of the initial dose at fortnight interval. Sampling: The ponds were sampled at fortnightly intervals to assess growth and condition of fish and feeding was adjusted on the estimated fish biomass in ponds. Physico-chemical parameters of water viz., temperature, pH, dissolved oxygen and transparency were determined fortnightly according to the standard procedure and methods. The quantitative abundance of plankton was estimated fortnightly, using a Sedgewick- . Rafter counting cell. After six months of rearing, all fishes were harvested by draining out the pond water and growth, survival and production of fishes were estimated. Statistical analysis: Data were analyzed for one-way ANOVA and any difference at 5% level of significance using the statistical package of STAT-GRAPHICS Version 7.

Source of Information: Bangladesh J. Fish. Res., 12(1 ), 2008: 75-80

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

GIFT monoculture in freshwater ponds in coastal area is better than mixed culture with silver barb, due to their high growth performance. It is also suggested that GIFT can be a potential fish species to be commercially introduced into culture system to get higher production from the rain-fed seasonal freshwater ponds of coastal area.

Knowledge Management: Journal