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Research Detail

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Roy Bikram Jit
Scientific Officer
Marine Fisheries Survey Management Unit, Chittagong, Bangladesh.

Nripendra Kumar Singha
Scientific Officer
Marine Fisheries Survey Management Unit, Chittagong, Bangladesh.

S.M. Hasan Ali
Scientific Officer
Marine Fisheries Survey Management Unit, Chittagong, Bangladesh.

Md. Gaziur Rhaman
Scientific Officer
Marine Fisheries Survey Management Unit, Chittagong, Bangladesh.

The study was conducted during March 2011 to August 2011 in the east southern coastal area of Bangladesh marine territory to record landing trends, percentage composition and exploitation practice of marine swimming crabs from Shahparir dwip, Teknaf sadar, Shamlapur, BFDC fish harbour and Moheskhali fish landing centers at Cox’s Bazaar district. In this study three swimming crab species were recorded under the family Portunidae, such as- Blue swimming crab- Portunus pelagicus (Linnaeus,1758), Three spot swimming crab- Portunus sanguinolentus (Herbst, 1783) are abundantly available and Cross crab- Charybdis feriatus (Linnaeus, 1758) is found incidentally in the artisanal fishing. A total 74.650 MT of swimming crabs species were landed different select landing centers which exploited from the Elephant point area (in the Bay of Bengal) at Cox’s Bazaar district. In the total catch, highest landing amount was recorded 23.480 MT (31.45%) at BFDC fish harbour and lowest was 8.520 MT (11.41%) at Shaparir dwip landing center. The highest landing of catch per boat per day (CPUE) was 1.81 kg in Teknaf sadar landing center in May, 11 and the lowest CPUE was 0.18 kg in August, 11 at Shahparir dwip. Lower grade of male crabs were 30-80 gm in weight and female crabs were 40-90 gm constituted 18.0% and 24.0% respectively in total exploitation.
  Landing centers, Marine swimming crabs, Exploitation practice, landing trends, Percentage composition
  Cox’s Bazaar district.
  00-03-2011
  00-08-2011
  Resource Development and Management
  Crab
  1. To know the marine swimming crabs as by-catch in artisanal fishery of the Bay of Bengal
The main five landing centers are Shahparir dwip, Teknaf sadar, Shamlapur, BFDC fish harbour and Moheskhali at Cox’s Bazaar district in order to cover a wide range of the most marine swimming crab species landing, retail and whole sale marketing from the Bay of Bengal. Totally more than 500-600 numbers of boats were engaged for marine swimming crab harvesting. These artisanal fishing boats are typically 8.0-9.0 meters long, width 2.13 to 2.50 m, having engine horse power (hp) ranges from 20 hp -22 hp, the numbers of fishermen were 6-7, active fishing days per month were 25-27 and trip duration per day was twice. The most common type of commercial fishing gear for swimming crab species is Jew fish or croaker fish catching net which is monofilament modified small mesh drift gill net (SMD). The total length is about 3000-4000 meters (m), depth from 2.75-3.57 m. and mesh size of 5.0-5.2 centimeters (cm). Another type of crab fishing gear is crab pot, which is a rectangular bamboo made trap with two entrance and height is 60 cm and width 40 cm, it is used in bottom and fixed with a rope. This crab pot is used as a gear less than 5% fishermen. And sometimes are caught incidentally by the marine set bag nets and trawl nets also. Data collection sampling was conducted by the Marine Fisheries Survey Management Unit, Chittagong from March, 2011 to August, 2011. Collected data were processed and analyzed using Microsoft Excel.
  Global Advanced Research Journal of Agricultural Science (ISSN: 2315-5094) Vol. 2(11) pp. 283-288, November, 2013.
  
Funding Source:
  

In the total catch, highest landing amount was recorded 23.480 MT (31.45%) at BFDC fish harbour and lowest was 8.520 MT (11.41%) at Shaparir dwip landing center. The highest landing of catch per boat per day (CPUE) was 1.81 kg in Teknaf sadar landing center in May, 11 and the lowest CPUE was 0.18 kg in August, 11 at Shahparir dwip. Lower grade of male crabs were 30-80 gm in weight and female crabs were 40-90 gm constituted 18.0% and 24.0% respectively in total exploitation.

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