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STUDIES ON THE THREADHN BREAM AND THE LIZARD HSH RESOURCES IN THE EXCLUSIVE ECONOMIC ZONE OF INDIA BASED ON THE DEMERSAL TRAWLING OPERATIONS OF FORV SAGAR SAMPADA
Central Marine
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Abstract
The present paper deals with the distribution and abundance of the threadfin bream and the lizardfish resources available for exploitation in the Exclusive Economic Zone of India based on the demersal trawling operations of FORV Sagar Sampada during her cruises 1-55. The area siu^eyed was divided into the northwest, southwest, northeast, southeast, Wadge Bank It Gulf of Mannar and the Andaman & Nicobar Islands and the stock abundance was computed for each latitude zone. Threadfin breams occurred at 39.0% and lizardfishes at 31.7% of the total 387 trawling stations covered during 1985-'88. Threadfin breams predominated in the trawling operations in thet Wadge Bank and the southwest coast forming 34.6 and 44.3% of the total trawl catch respectively. Along the east coast the resource is poor compared to the west coast. The peak abundance of the resovirce was in 41-80 m depth in the southwest and in 61-80 m depth in the northwest forming significant percentage of the demersal resources. Along the east coast the relative abundance was higher in depths of 80-150 m. The threadfin bream resource was constituted mainly by Nemi;>terus;aponicus and N.mesoprion along with small quantities of N. bleekeri. N. metopias occurred in the northeast and the Andaman & Nicobar region. Lizard fishes constituted 3.7 and 4.6% of the total demersal fish resource in the southwest and northwest region respectively. It was relatively more abundant in the northeast forming 0.6%, whereas in the southeast it formed only 0.4% of the total trawl catch. Along the west coast, the relative abundance of the resource was generally high in 41 -60 m depth. The resource was composed mainly olSaurida tumbil and S. undosquamis along with small quantities of S. hngirmna. The paper also deals with biological characteristics like size distribution, gonadial condition etc. of the main constituent species.