REPORTS - BOBP/REP/37
High-Opening Bottom Trawling in tamil Nadu, Gujarat and Orissa : A Summary of Effort and Impact
by
B.T. Antony Raja
Consultant, Bay of Bengal Programme
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REPORTS - BOBP/REP/37 High-Opening Bottom Trawling in tamil Nadu, Gujarat and Orissa : A Summary of Effort and Impactby B.T. Antony Raja Consultant, Bay of Bengal Programme |
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Executing Agency: FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Funding Agency: UNITED NATIONS DEVELOPMENT PROGRAMME Development of Small-Scale Fisheries in the Bay of Bengal. Madras, India, February 1987 |
| The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. |
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© FAO 2004
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Between 1980 and 1985, the small-scale fisheries project of the Bay of Bengal Programme (BOBP) demonstrated fishing techniques with various types of high-opening bottom trawls in Tamil Nadu and Orissa, in cooperation with the fisheries departments of these states. New deck equipment and machinery and simple trawl rigging accessories for standard Indian coastal trawlers were also locally developed, demonstrated and introduced. In Gujarat, training and experimental fishing in high-opening bottom trawling were conducted early 1983 by CIFNET (Central Institute of Fisheries Nautical and Engineering Training). BOBP provided technical and material support to the ClFNET effort. It was hoped that high-opening bottom trawls would help relieve fishing pressure on prawn resources, put idle prawn trawlers to gainful use during the off season and help tap underexploited food fish resources. The innovations with deck equipment and gear accessories were intended to make trawling effort safer, more efficient and more comfortable. This paper summarizes the results of the high-opening bottom trawl demonstrations and the response to them in the three states. It also sums up the impact of trawling effort following BOBP demonstrations on fishery resources; and discusses the present status of gear designs and of deck equipment. Future prospects concerning high-opening bottom trawling are also discussed. |
SUMMARY
1. INTRODUCTION
2. RECORD AND RESULTS OF ACTIVITIES
2.1 FISHING TRIALS
2.1.1 TAMIL NADU
2.1.2 GUJARAT
2.1.3 ORISSA
2.2 DECK MACHINERY/EQUIPMENT AND TRAWL ACCESSORIES
2.2.1 OTTER BOARDS
2.2.2 GANTRY
2.2.3 NET DRUMS AND THREE-DRUM WINCH
2.2.4 TILTABLE DRUM WINCH
2.2.5 SPLIT LINKS
2.2.6 COD-END CLIP
3. LANDINGS, EFFECTS AND IMPACT
3.1 TAMIL NADU
3.1.1 PRODUCTION
3.1.2 TRAWL DESIGN
3.1.3 NETTING MATERIAL
3.1.4 DECK EQUIPMENT
3.1.5 ECONOMICS
3.2 GUJARAT
3.2.1 PRODUCTION
3.2.2 TRAWL DESIGN
3.2.3 NETTING MATERIAL
3.2.4 DECK EQUIPMENT
3.2.5 ECONOMICS
4. FUTURE PROSPECTS
TABLES
1. Broad specifications of trawl designs
2. Summary data of fishing trials with high-opening bottom trawls in Tamil Nadu
3. Summary record of catches by four commercial boats off Gujarat in March 1983
4. Summary record of catches by high-opening bottom trawls as compared to conventional shrimp trawls in Orissa, 1984/85
5. Estimated marine fish landings in Tamil Nadu, 1981-85
6. Estimated trawler landings at some important centres in Tamil Nadu, 1981-85
7. Summary of catch and effort data at Tuticorin, 1981-86
8. Types of trawl used at some important centres in Tamil Nadu
9. Production of HDPE webbing at Tamil Nadu Agro Industries Corporation, Madras, 1981/82- 1985/86
10. Estimated marine fish landings in Gujarat, 1981/82- 1985/86
11. Estimated marine fish landings in Veraval, 1982/83- 1985/86
12. District-wise marine fish landings in Gujarat, 1981/82- 1985/86
13. Distribution of HDPE webbing by Gujarat Fisheries Central Cooperative Association, Veraval, 1983/84- 1985/86
14. Comparative performance of CS and OFS at Veraval for the period,
September 1984 to April 1985
FIGURE
1. High-opening bottom trawling locations, 1980-85
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