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Culture Potential Ofamblypharyngodon Mola with Carps in Polyculture in Farmers' Ponds of Northern Regions of Bangladesh

M. Kunda
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202; .Bangladesh

S.A.A. Nahid
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202; .Bangladesh

M.A. Wahab
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202; .Bangladesh

S.H. Thilsted
Department of Human Nutrition, University of Copenhagen, Frederiksberg, Denmark

N. Roos
Department of Human Nutrition, University of Copenhagen, Frederiksberg, Denmark

Abstract/ Executive Summary:

To assess the culture potential of mola (Amblypharyngodon mala) along with carps in polyculture systems, an experiment consisted of three treatments each with five replications was conducted for 4 months in two villages of Parhatipur upazilla under Dinajpur district. In the first treatment (SS), catla, rohu, mrigal, grass carp, Thai punti, common carp and a higher density of silver carp (8 per 40m²) were stocked. In the second trcaLment (SM), stocking density of silver carp was reduced to half and mola was added at a stocking density of 12,500/ha with all other fishes used in SS. In the third treatment (MM), no silver carp was stocked and mola was added at a stocking density of 25,000/ha with all other fishes used in SS. All treatments were subjected to the same regime of feed and fertilizers. The yields of large carps were 2035 kg/ha, 1757 kg/ha and 1326 kg/ha for treatments SS, SM and MM, respectively. Catla, grass carp and carpio showed better growth and production performance in presence of mola at a higher density, while rohu, Thai punti and mrigal showed better performance when stocking density of mola was relatively low. Mola yield was almost two times higher (184 kg/ha) in absence of silver carp (MM) than (62 kg/ha) in presence of silver carp (SM). The result showed that there was a significantly (p<0.01) lovver total fish production in treatment MM. But there were no significant difference in total production between treatment SS and SM.

Keywords: Amblyplunyngodon mola, Polycul ture, Carps Introduction

Location: Dinajpur district.

Start Date: 00-07-2005

End Date: 00-11-2005

Program Area: Farming System

Commodity: Carp fish, Fish

Objectives:

To know the culture potential of mola with major carps in the polyculture in the farmers' pond of northern region of Bangladesh

Methodology:

The experiment was carried out in farmers' ponds at Nowdapara and Kalaighati village of Parbatipur Upazilla, Dinajpur from July to November 2005. Pond size ranging from 6 to 21 decimals (decimal = 40m²) with 1 to 1.5 m water depth. All ponds were rain-fed, well exposed to prevailing sunlight and without an inlet or outlet. Design of the experiment: The experiment was conducted with 3 treatments each vvith 5 replicates. Replicates of each of three treatment groups were assigned by stratified random selection of ponds. Stocking density Thai punti and all Indian major carps were same in all treatments. In the control treatment (SS) stocking density of silver carp was 8 per decimal which was partially replaced with mola (4 silver carp and 50 mola per decimal) in the second treatment (SM). Silver carp was fully replaced by mola (100 mola per decimal, no silver carp) in the third treatment (MM). Pond preparation & stocking of fish: All predatory and other fishes were removed from the experimental pond by repeated netting. Ponds were prepared properly with lime at the rate of 1 kg per decimal and initial fertilization with urea, TSP and cowdung at the rate of 400 g, 400 g and 5 kg per decimal, respectively. Fingerlings of carps and Thai punti were collected from the hatchery of the Northwest Fisheries Extension Project (NFEP), Dinajpur. Mola fry was collected both from local farmers and NFEP hatchery ponds. Initial length and weight of fingerlings were measured before releasing into the pond. Post stocking management: Mustard oil cake and rice bran were used as supplementary feed at the rate of 2% body Weight of fish. After stocking of fish urea, TSP and cowdung were used at 10 days interval at the rate of 100 g, 100 g and 4 kg per decimal, respectively. Fishes were sampled monthly using a seine net. The length and 'Weight of 20 individuals of each species were recorded in prescribed format. Length was taken by using a centimeter scale and Weight by using a portable balance. Water quality determination: Water quality parameters such as temperature (°C), transparency (cm), dissolved oxygen (mg/L) and pH vvere measured on the spot once in a month. Water transparency was measured with a secchi disc. Temperature and dissolved oxygen of water was measured by portable digital DO meter (YSI model 85-10 FT). pH was measured by direct reading with a digital pH meter (HANNA HI-98107) on spot. Study of growth and production of fish: Fish were harvested at the end of experiment by repeated netting vvith seine net and were measured and weighed. The following parameters were used to evaluate the growth: a) Average weight gain =Mean final fish weight- mean initial fish weight b) Specific growth rate. Statistical analysis: The data obtained in the experiment were analyzed statistically by analysis of variance CANOVA) and Duncan's Multiple Range Test (DMRT) as post-hoc test using SPSS (version 11.5) statistical software (SPSS Inc., Chicago, USA). Differences were considered significant at an alpha of 0.05, and means were given with ± standard error (SE).

Source of Information: Bangladesh J. Fish. Res., 13(1), 2009:01-10

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Catla, grass carp and carpio showed better growth and production performance in presence of mola at a higher density, while rohu, Thai punti and mrigal showed better performance when stocking density of mola was relatively low. Mola yield was almost two times higher (184 kg/ha) in absence of silver carp (MM) than (62 kg/ha) in presence of silver carp (SM).

Knowledge Management: Journal