2004년 하계 한국 남해에 있어서 저층 트롤 어획물의 종조성

Abstract

The experiment was conducted to investigate the species composition of catches collected by the bottom trawl on June 24 to 26, 2004 in the southern waters of Korea using a trawler "DONGBAEK" belongs to Yosu National University. The investigation was carried out at the 5 stations and the towing speed was 3.4～3.7k't. The catches were composed of 46 species from 37 families, 10 orders and 2 classes for fishes and 2 species, 2 families and 2 orders for Chondrichthyes and 44 species, 35 families, 8 orders for Osteichthyes. The catches of Perciforms were the highest as 24 species and 18 families for fishes. The catches of Spear squid, Loligo bleekeri and Red banded lobster, Metanephrops thomsoni were also the highest for mollusca and crustacea as 1 class, 3 species, 3 families, 2 orders, 1 class and 7 species, 5 families, 1 order, 1 class respectively. In the 5 stations, number of individuals and biomass were 1,144 and 376.0kg at ST-1, 908 and 240.3kg at ST-2, 666 and 90.1kg at ST-3, 2,050 and 300.4kg at ST-4 and 561 and 24.7kg at ST-5. The diversity index of each stations ranged between 1.49 and it showed the richness index of 2.13～3.48, the evenness index of 0.48～0.77 and the dominance index of 0.43～0.8. Body length distribution of the dominant specise were 9～32cm(fork length) for Japanese horse mackerel, Trachurus japonicus, 7～23cm(mantle length) for Common squid, Todarodes pacificus, 9～43cm(mantle length) for Spear squid, Loligo bleekeri , 23～36cm(total length) for File fish, Thamnaconus modestus, 10～28cm(fork length) for Yellow porgy, Dentex tumifrons, 10～36cm(fork length) for Target dory, Zeus faber and 8～35cm(fork length) for Red seabream, Pagrus major.