BOBP/WP/94
Biosocioeconomic Assessment of the Effect of the Estuarine Set Bagnet on the Marine Fisheries of Bangladesh - BOBP/WP/94

WORKING PAPERS - BOBP/WP/94

Biosocioeconomic Assessment of the Effect of the Estuarine Set Bagnet on the Marine Fisheries of Bangladesh

by
Md G. Khan, Md S. Islam, Md G. Mustafa, Md N. Sada & Z. A. Chowdhury Management and Development Project, Department of Fisheries,
Chittagong, Bangladesh


Executing Agency: FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS

Bay of Bengal Programme Madras, India, 1994

Table of Contents


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PREFACE

The estuarine set bagnet (ESBN) fishery of Bangladesh is one of the country’s niost important traditional fisheries and a large population of small-scale fisherfolk have been dependent on it for a long time. In the last two decades, the introduction and rapid expansion of the bottom trawl fishery and of shrimp culture have contributed to problems of interaction and competition among the fisheries which exploit the same penaeid shrimp and demersal finfish stocks. The traditional, but less efficient, ESBN fishery has not only become vulnerable, being likely to be affected by other fisheries, but may also be destructive to small penaeid shrimp and some of the finfish resources that these other fisheries exploit. The Department of Fisheries, Bangladesh, decided to investigate this issue and the Bay of Bengal Programme (BOBP) was requested to assist. The study was funded by the United Nations Development Programme (UNDP). Bioeconomic and socioeconomic surveys were undertaken in 1989/90 and a National Seminar was held in January 1992 to discuss the results.

Because of the interactive nature of many of the marine fisheries, it was necessary, for the assessment and management of any one fishery, to consider the other fisheries exploiting the same resources. Therefore, in addition to the estuarine set bagnet fishery, the fisheries employing marine set bagnets (MSBN), trammelnets (TRN), beach seines (BS), bottom longlines (BLL) and trawlnets (TWL), as well as shrimp fry-collection using pushnets (PN) and dragnets (DN), were investigated. These studies have been documented separately in BOBP working papers BOBP/WP/89 Studies of Interactive Marine Fisheries of Bangladesh and BOBP/WP/90 — The Socioeconomic Condition of the Estuarine Set Bagnet Fisherfolk in Bangladesh. The present paper is based on the results and findings of these publications and assesses the biosocioeconomic impact of the ESBN fishery on the other marine fisheries of Bangladesh. The working papers mentioned provide additional information on the respective fisheries.


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TABLE OF CONTENTS


WORKING PAPERS - BOBP/WP/94pdf

1. SUMMARY
2. APPROACH AND METHODS
3. FISHERIES AND SPECIES UNDER CONSIDERATION
4. FISHING AREAS
5. FISHING EFFORT AND PRODUCTION
6. PRODUCTION TRENDS OF SELECTED SPECIES
7. SIZE SELECTIVITY
8. GROWTH PARAMETERS
9. RECRUITMENT PATTERN AND SPAWNING SEASONS
10. LIFE CYCLE OF SELECTED SPECIES
11. POPULATION SIZE AND FISHING MORTALITY OF SELECTED SPECIES

11.1 Tiger shrimp
11.2 Brown shrimp
11.3 White shrimp
11.4 Ribbonfish
11.5 Bombay duck
11.6 Croaker

12. YIELD AND REVENUE PREDICTIONS
13. SOCIOLOGICAL CHARACTERISTICS OF ESBN FISHERFOLK
14. ECONOMIC ACTIVITIES IN THE ESBN FISHING VILLAGE

14.1 Fishing activities
14.2 Fishery-related activities in ESBN fishing villages
14.3 Nonfishing activities
14.4 Income distribution

15. PERCEPTIONS OF ESBN FISHERFOLK
16. DISCUSSION
17. SUGGESTIONS AND RECOMMENDATIONS

17.1 Marine fisheries resources management and development
17.2 Estuarine set bagnet fisheries
17.3 Shrimp seed-collectors and hatcheries, for culture
17.4 Socioeconomics and extension services

18. REFERENCES

APPENDICES

I. Relative vulnerability of different species to different gear
II. Regression coefficients for (A) Length vs Weight, and (B) Carapace length vs Total length of selected species

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