REPORTS - BOBP/REP/39
Investigations on the Mackerel and Scad Resources of the Malacca Straits
Executing Agency: FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Funding Agency: UNITED NATIONS DEVELOPMENT PROGRAMME
Marine Fishery Resources Management in the Bay of Bengal. Colombo, Sri Lanka, December, 1987
Table of Contents
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This report summarizes the findings and results of investigations concerning the mackerel resources of the Malacca Straits undertaken during 1984-1986. These were organized by a working group established for this purpose in 1983, consisting of fishery biologists from Indonesia, Malaysia and Thailand. The objectives were to examine available data on the mackerel resources of the Malacca Straits (Indonesia, Malaysia and Thailand) to identify lacunae in the data, suggest improvement to data collection systems and analyse the present status of the resources.
The first meeting of the group was held in Penang, in December 1983. The outcome of that base line meeting was summarised in an earlier publication (BOBP/WP/30). Following the recommendations of the first meeting, sampling programmes were improved in all three countries and sampling study tours and training programmes were conducted. Progress was monitored and discussed at the second and third meetings of the working group held in Colombo (Oct. 1985) and Phuket (Aug. 1986). This report incorporates the deliberations of these two meetings.
This report, the sampling programmes and the working group meetings were sponsored by the “Marine Fishery Resources Management” component of the Bay of Bengal Programme (BOBP). The project commenced in January 1983 and terminated December 1986. It was funded by the UNDP (United Nations Development Programme). Its immediate/objective was to improve the practice of fishery resources assessment among participating countries and to stimulate and assist in joint management activities between countries sharing fish stocks.
2.1 THE FISHERIES
2.2 SPECIES COMPOSITION
2.3 CATCH RATES AND SEASONALITY
2.4 LENGTH FREQUENCY DISTRIBUTION
2.5 MATURITY AND SPAWNING
2.7 MIGRATORY TRENDS
2.8 MORPHOMETRIC COMPARISON
3. STATE OF THE FISHERIES
4. FUTURE ACTIVITIES AND RECOMMENDATIONS
1. Production of Rastrelliger bfachysoma and R. kanagufta.
2. Production of Decaptefus spp.
3a. Peak catch, catch rates, peak seasons and size ranges of R. brachysoma in the purse seine fishery.
3b. Peak catch and catch rates and peak seasons for R. brachysoma in the trawl fishery in Malaysia.
4. Peak catch, peak catch rates, peak seasons and size ranges during the peak season of R. kanagurta in the purse seine fishery.
5. Peak catch, peak catch rates, peak seasons and size range caught during peak seasons of Decapterus spp.
6. The mean size at first maturity of scads and mackerels.
7. Growth parameters of mackerels and scads.
8. Summary of estimates of maximum sustainable yield (MSY) and optimum effort for mackerels and scads.
1. Map of the Malacca Straits and the sampling locations.
2. The production of mackerels by country.
3a. The production of R. bfachysoma and R. kanagufta, by country.
3b. The production of Decaptefus spp., by country.
4. Mean catch rates of R. bfachysoma, January-April, 1985.
5. Mean catch rates of R. bfachysoma, May-August, 1985.
6. Mean catch, rates of R. brachysoma, September-December, 1985.
7. Mean catch rates of R. kanagurta, January-April, 1985.
8. Mean catch rates of R. kanagurta, May-August, 1985.
9. Mean catch rates of R. kanugufta, September-December, 1985.
10. Mean catch rates of Decaptefus spp. January-April, 1985.
11. Mean catch rates of Decaptefus spp. May-August, 1985.
12. Mean catch rates of Decaptefus spp. September-December, 1985.
13. Restructured frequencies and growth curves (ELEFAN I analysis) for R. kanagufta on the west coast of Thailand (Areas I, II & III combined).
14. Restructured frequencies and growth curves (ELEFAN I analysis) for R. brachysoma on the west coast of Thailand (Areas II and III combined).
15. Hypothetical migratory pattern for R. brachysoma.
16. Hypothetical migratory pattern for R. kanagurta.
1. List of participants in the Second and Third Working Group Meetings.