* ICLARM is now known as WorldFish Center

Naga - The *ICLARM Quarterly
Vol. 22, No. 4 (October - December 1999)

Network of Tropical Aquaculture Fisheries Professionals (NTAFP) Section

Aquabyte (Aquaculture Section of NTAFP)

Brush Shelter: A Recently Introduced Fishing Method in the Kaptai Reservoir Fisheries in Bangladesh
K.K. Ahmed and J.B. Hambrey

Since the early 1990s, the brush shelter fish aggregation device (FAD), an unusual fishing method used in Bangladesh, has become popular with the fishers of Kaptai Lake. A shelter commonly covers an area between 0.02 and 0.12 ha and is usually installed along the edge of a channel (arm of lake) with a reasonable water depth. Brushes are square/rectangular/round surrounded with bamboo or wooden frames constructed with tree branches. To attract fish, water hyacinth is placed over the surface. The difference between this fishing practice and similar ones used elsewhere in Bangladesh is that it makes use of locally available feed ingredients (rice bran, wheat bran, mustard oil cake, fermented rice, etc.). Spices and fish scents are also used two to three days prior to harvest. It is estimated that about 1000 brush shelters are in operation around the reservoir and are fished twice a year. The quantity of fish caught in each brush varies directly with the size and location of the brush and feed quality. A total of 483 t of fish of different species is harvested annually, accounting for about 8% of the total catch from the reservoir. Unplanned and unregulated use of this type of fishing poses a serious threat both to the natural stocks and to the effectiveness of stock enhancement as mostly small fish are harvested.

K.K. Ahmed is from the Bangladesh Fisheries Research Institute Riverine Sub-station, PO Box-8, Rangamati-4500, Bangladesh. J.B. Hambrey is from the Aquaculture and Aquatic Resources Management Program, School of Environment, Resources and Development, Asian Institute of Technology, Bangkok, Thailand.

Broodstock Management Status and Some Suggestions to Control Negative Selection and Inbreeding in Hatchery Stocks in Bangladesh
M.G. Hussain and M.A. Mazid

The freshwater river systems and floodplains of Bangladesh are the breeding grounds for 13 endemic species of carps and barbs and a large number of other fish species, including a number of exotic carps and other species that have been introduced for aquaculture. Since 1967, breeding of endemic and exotic aquaculture species for seed production through hypophysation techniques has become a common practice. Over 700 hatcheries established in the private and public sectors have been breeding 13 endemic and 13 exotic fish species and contributing more than 98% (about 117 000 kg) of the total spawn (hatchery) production. Stock deterioration in hatchery populations due to poor broodstock management and inbreeding depression has been observed. Retarded growth, poor reproductive performance, morphological deformities, increased incidence of disease and mortality of hatchery-produced seeds have been reported. The widespread stocking of such genetically poor quality fish seed in closed and open waterbodies is causing concern. In this situation, there is an obvious need to adopt proper broodstock management strategies and breeding plans for commercially important fish species.
The paper describes the present status of broodstock management, identifies problems, and suggests some guidelines to control negative selection and inbreeding in hatchery stocks in Bangladesh.

M.G. Hussain and M.A. Mazid are from the Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh.

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