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Optimization of Stocking Density of Gulsha (mystus Cavasius) in Cage Ecosystem in the River Brahmaputra, Mymensingh

Md. Shahidul Islam
Senior Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh

Dr. A.H.M. Kohinoor
Senior Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh

Md. Moshiur Rahman
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh

Abstract/ Executive Summary:

The fingerlings of gulsha (M. cavasius) were stocked in the cages at three stocking densities viz., 800, 1000 and 1200/m3. Fishes were fed regularly with supplementary feed containing 30% crude protein @ 5-20 % of body weight twice daily. After 180 days of rearing, fishes were harvested. On the basis of final growth attained, it was observed that the highest average weight was found with stocking @1000/m3.

Keywords: Optimization, Stocking density, Gulsha, Cage ecosystem

Location: Brahmaputra river, Mymensingh

Start Date: July 2010

End Date: June 2013

Program Area: Variety and Species

Commodity: Cat fish

Objectives:

a. To optimize the suitable stocking density of gulsha in net cages. b. To analyze the cost-benefit ratio of gulsha in net cages.

Methodology:

The cages were made by locally available cage materials e.g., iron rod, net of suitable mesh size (1.0 cm), plastic floats, bamboo, plastic ropes etc. The area of each floating net cages was 4.0 m3. Each cage was covered with another piece of net at the top to prevent escape of fish by jumping and bird predation. The whole structure was fixed with bamboo poles at each corner of the structure by making loop with nylon rope to facilitate easy floating of cages depending on water level. Fingerlings of gulsha were stocked in net cages @ 800, 1,000 and 1,200/m3 for a period of 6-7 months. Pelleted feed containing 30% crude protein @ 5-20 % of body weight was given twice daily. Water quality parameters such as water temperature (oC), dissolved oxygen (mg/l), pH, and transparency (cm.) were recorded and analyzed at two days interval.

Source of Information: Annual Research Program 2012-13. BFRI, Mymensingh.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Five lack

Total Budget (Tk.) : Five lack

Achievement/Findings:

In Bangladesh, cage culture could have a significant impact on an aquaculture production. Tilapia is a suitable species and well adopted in cage environment. Small fish like gulsha (M. cavasius) could be a suitable specie in cage if suitable stocking density for culture maintained.

Knowledge Management: Report/Proceedings