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Impact of Chapila (gudusia Chapra Ham.) on Growth of Carps in Polyculture

M.A. Hossain
Bangladesh Fisheries Research Institute, Mymenshing-2201

S. Dewan
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.S. lslam
Bangladesh Fisheries Research Institute, Mymenshing-2201

A.K.M.A. Kabir
Bangladesh Fisheries Research Institute, Mymenshing-2201

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

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

Abstract/ Executive Summary:

The impact of chapila (Gudusia chapra) on the growth of carps was determined through introducing the fish in polyculture. A net average production with and without chapila were obtained at 467.11 and 889.54 kg/ha respectively (PO.OS). The highest level of dietary overlap occurred between chapila and catla followed by chapila and rohu (Pchapila reduces the net production at 47.49% in carps polyculture.

Keywords: Carps, Polyculture, Chapila

Location: Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-1995

End Date: 00-11-1995

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To observe the growth and determine the feasibility of culturing chapila in polyculture system by evaluating the production and dietary overlap among selected species (chapila, rohu, catla and mrigal).

Methodology:

The experiment was conducted for a period of five months July to November, 1995 in six ponds of 500 m² with an average depth of 1.5m. The ponds were fertilized with urea and triple super phosphate (TSP) @ 25 kg/ha respectively, after three days of liming @ 250 kg/ha. Three ponds were stocked with Indian major carps viz., rohu, catla and mrigal at the ratio of 4:3:3 at a stocking density of 6000/ha and the rest three ponds were stocked with the same manner plus 25% (1500/ha) of the total number with chapila under the treatment I and II, respectively.Twenty fish of each species were randomly sampled fortnightly to know the growth and for adjustment the feeding on the basis of standing crop. All the ponds were fertilized fortnightly with Urea and TSP @ 25 kg/ha. The fishes were fed with supplementary feed with rice bran and mustard oil cake (2:1) daily at 3% of the total body weight. Routine sampling for water quality parameters such as DO, pH, transparency and temperature were monitored weekly between 8.0-9.0 AM. Five fishes were sacrificed and plankton sample collected through plankton net from each of the three ponds of the treatment II fortnightly. The preserved samples of plankton from ponds water and stomach content were investigated through a binocular microscope (X1 0) using a Sedgewick-Rafter Cell (Model 550, Fisons) following a standard method for counting plankton and identified upto genus level. The dietary overlap among G. chapra, L. rohita, C. catla and C. migrala were determined.

Source of Information: Bangladesh J. Fish. Res., 1 (2) : 19-23, 1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The study reveals that the chapila does not suite in polyculture with Indian major carps because the fish is a strong filter feeder and heavily compete for food with catla and rohu.

Knowledge Management: Journal