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Sharks and Rays Fisheries of the Bay of Bengal at the Landing Centers of Chittagong and Cox’s Bazar, Bangladesh

Bikram Jit Roy*
Marine Fisheries Survey Management Unit, C.G.O. building-2, 6th floor, Agrabad, Chittagong, Bangladesh.

S.M. Hasan Ali
Marine Fisheries Survey Management Unit, C.G.O. building-2, 6th floor, Agrabad, Chittagong, Bangladesh.

Nripendra Kumar Singha
Marine Fisheries Survey Management Unit, C.G.O. building-2, 6th floor, Agrabad, Chittagong, Bangladesh.

Md. Gaziur Rahman
Matshya Bhaban, Dhaka, Bangladesh.

Abstract/ Executive Summary:

The study was conducted on the species composition and percentage contribution of sharks and rays from two landing centers (Fishery ghat, Chittagong and BFDC fish harbour, Cox’s Bazar) during 2011-2012 fiscal year. A total 10 species of sharks belonging to 3 families and 14 species of rays belonging to 8 families were recorded. Total landings of sharks and rays by weight were 382.67 MT of which 136.45 MT was sharks and 246.22 MT was rays. A total 479661 numbers of sharks and rays were landed of which 449133 were sharks and 30528 were rays but contribution of sharks and rays were 35.66% and 64.34%, respectively by weight. The highest landing was 70.94 MT in the month of October, 2011 and lowest landing was 6.05 MT in the month of January, 2012. The highest landing of shark species was Scoliodon laticaudus (84.52 MT) (22.09%) and lowest was Carcharhinus sorrah (0.01MT) and the maximum and minimum landing of rays species were Himantura uarnak (164.42MT) (42.97%) and Aetobatus narinari (0.03% MT), respectively.

Keywords: Sharks and rays, species composition, Bay of Bengal, Cox's Bazar, Chittagong

Location: Fishery ghat, Chittagong and BFDC Fish harbour, Cox’s Bazar district

Start Date: 01-07-2011

End Date: 30-06-2012

Program Area: Socio-economic and Policy

Commodity: Cat fish

Objectives:

To provide an overview of landing trends, species composition and percentage contribution in shark fisheries producing and exporting from an economic and social point of view.

Methodology:

The main two landing centers of sharks and rays situated at Fishery ghat, Chittagong and BFDC Fish harbour, Cox’s Bazar district were selected for sampling in order to cover a wide range of the most sharks and rays landing retail and whole sale marketing, target and incidental catch of shark and ray species from the Bay of Bengal. The field visit was undertaken for a year starting from July, 2011 to June, 2012 at the mentionable two fish landing centers where only 80-100 numbers of boats are engaged for sharks and rays fishing commercially in the southern part of the Bay of Bengal fishing grounds. Species-wise sharks and rays landing data were recorded at both landing station and on board commercial fishing vessels. In the selected sampling station elasmobranches catch data were collected by 5 Scientific Officer and 10 field staff alternately. The data were collected in new-moon, full-moon, first quarter, last quarter and other days of the moon month from the landing center. Sampling days were 8 in each month of the year continuously by the Marine Fisheries Survey Management Unit, Chittagong. Species were identified locally and unidentified species were preserved in 5- 7% formalin solution just after collection from the landing centers, brought to laboratory to find out lowest possible taxonomic level.

Source of Information: Bangladesh J. Zool. 41(1): 49-60, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The major problem on shark and ray fisheries are the lack of catch and species composition data, as most fisheries doesn’t report shark landings by species and lack of species identification knowledge of shark. No information on biological data or size compositions of species landed, stock assessment for sharks in Bangladesh has never conducted. For proper management and conservation of shark fisheries there is need for a National Action Plan.

Knowledge Management: Journal