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Trials In Bangladesh Of Large-Mesh Driftnets Of Light Construction - BOBP/WP/12

Year of publication 1981

Place of publication Rome, Italy ;

Pages p.15

Author G. Pajot and T.K. Das

Category Programme / project report

Edition 1

Synopsis (short abstract) This document is the second report of a fishing gear improvement project in Bangladesh. It describes the rationale, the mechanics and the findings of experiments with large-mesh driftnets of thin twine conducted near Chittagong from October 1980 to February 1981. The experiments were carried out in cooperation with the Kalidaha Fishing Projectof CARITAS, a social service agency. In a parallel activity, experimental thin-twine large-mesh driftnets were also tried out by private fishermen in commercial fishing operations along with their own traditional fishing gear. The experiments yielded the finding that driftnets of thinner twine, which are about 40% cheaper than the traditional nets, also catch more fish than the traditional nets. Experiments were also carried out by BOBP with driftnets of different mesh sizes in cooperation with the Kalidaha Fishing Project. Here the conclusion was that large-mesh sizes are more effective than the smaller. The Ministry of Fisher ies and Livestock, Bangladesh, participated in the fishing gear improvement project as a cooperating agency. The project is an activity of the Programme for the Development of Small-Scale Fisheries in the Bay of Bengal, referred to in brief as the Bay of Bengal Programme. This is a regional FAO programme that seeks to develop and demonstrate appropriate technologies and methodologies in many areas of small-scale fisheries such as fishing craft, fishing gear, fishing methods and utilization and c oastal aquaculture. The Programmes goals are to improve the conditions of small-scale fisherfolk and the supply of fish from the small-scale sector in five countries that border the Bay of Bengal — Bangladesh, India, Malaysia, Sri Lanka and Thailand.

Language English

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    Programme / project report
    Improvement of Large-Mesh Driftnets for Small-Scale Fisheries in Bangladesh - BOBP/WP/5 1980
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    Driftnets account for nearly 30 per cent of the total marine catch in Bangladesh. With the polyamide (PA) or nylon twine used for constructing the nets getting scarcer and costlier, the driftnetters tend to carry less and less gear, affecting fish catch and incomes. It is therefore desirable to devise ways to ensure that driftnets cost less and/or produce more. This was the rationale for an experimental project conducted during the 1979/80 winter season. The boats used three kinds of fishing gear-the traditional large-mesh driftnets (45 ply), modified nets of thinner netting twine (27 ply) and nets of polyethylene material. Details of fish catch were recorded daily for thethree types of nets with the assistance of extension workers from the Kalidaha fishing project. A comparative study of the data obtained reveals that nylon nets of thinner twine size, which cost approximately 40% less than the traditional nets, caught about 40% more fish. Thus the thinner twine n ets are clearly preferable to the traditional. Following from these results, a promotional effort to extend the merits of this net is recommended, with the Bay of Bengal Programme assisting in the effort. As for the nets of polyethylene netting material, they also caught 45% more fish tha n the traditional nets, but sustained greater damages. Further studies are recommended on the efficacy of polyethylene netting material and on the optimum mesh sizes for large-mesh driftnets. Stud y tours of large-mesh driftnet fisheries in other countries are also recommended for Bangladesh national officers.
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    Programme / project report
    Improvement of Large-Mesh Driftnets for Small-Scale Fisheries in Sri Lanka - BOBP/WP/3 1980
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    Large-mesh driftnets play a pivotal role in Sri Lankas small-scale fisheries. They captured about 25% of all the fish Sri Lanka produced in 1978. In view of the rising cost of these widely used nets, a nine-month experimental project was conducted in 1979 on making the nets less costly and more productive. Under the project, fishermen-cum-boat-owners in two fishing centres-Beruwala and Velvettiturai- used two kinds of nets: traditional nets and the modified nets supplied by the Bay of Benga l Programme. Comparative data on fish catch by species and weight for the two kinds of nets revealed that nylon nets of finer yarn-which are 25% cheaper than the traditional nets-raised the fish catch by 20 to 30 per cent during the experiments. The other conclusions resulting from the experiments concern the ropes and floats used for driftnets. Polypropylene ropes and large cylindrical auxiliary surface floats are as good as —and cheaper than the nylon ropes and small longitudinal floats u sed at present with largemesh driftnets. Following from the above, the main recommendation is that the use of thinner nylon netting material, of polypropylene ropes and of large floats should be energetically promoted. Their manufacture and import should be encouraged.
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    Bulletin
    Summary Report of Fishing Trials With Large-Mesh Driftnets in Bangladesh - BOBP/REP/30 1986
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    This document reports on a fishing gear improvement project in Bangladesh. It describes the findings of fishing trials with large-mesh driftnets of thinner twine with different mesh sizes and made of different materials. Two working papers on the subject have been published earlier as BOBP/WP/5 (“Improvement of Large-Mesh Driftnets for Small-Scale Fisheries in Bangladesh”) and BOBP/WP/12 (“Trials in Bangladesh of Large-Mesh Driftnets of Light Construction”). Two other papers on Bangladesh f ishing gears have also been published : BOBP/WP/13 (“Trials of Two-Boat Bottom Trawling in Bangladesh”) and BOBP/WP/15 (“Pilot Survey of Driftnet Fisheries in Bangladesh”). The trials described in this paper started in 1979-80. They were conducted in cooperation with the Kalidaha Fishing Project of CARITAS, a social service organization, and the Marine Fisheries Department, Bangladesh, which provided local counterparts (Mr. T. K. Das, fishing technologist, and Mr. A. Bashiruddin, Assistant Inspector of Fisheries) for monitoring. A number of private fishermen also participated in the trials.
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