울진바다목장에서 어획된 가자미목(Pleuronectiformes) 어류의 군집구조 및 공간분포

Abstract

To elucidate the variation of species composition, biomass and length distribution of flatfishes by the period and region in the Uljin marine ranching area, bottom trawl survey was investigated at the six stations from Feb. 2008 to Dec. 2010. During the survey period, a total 4 families 17 species in the Pleuronectiformes, average 69,158 <TEX>$ind./km^2$</TEX> and 5,625 <TEX>$kg/km^2$</TEX> were identified, in 2008 appeared in 14 species, average 25,798 <TEX>$ind./km^2$</TEX> and 2,333 <TEX>$kg/km^2$</TEX> and in 2009 appeared in 13 species, average 102,360 <TEX>$ind./km^2$</TEX> and 5,634 <TEX>$kg/km^2$</TEX> and in 2010 appeared in 14 species, average 75,704 <TEX>$ind./km^2$</TEX> and 8,632 <TEX>$kg/km^2$</TEX>. The individual dominant species, occupying over 10% of total individuals, was Pleuronectes herzensteini (20,811 ind., 30.0%), Hippoglossoides pinetorum (18,666 ind., 26.9%) and Glyptocephalus stelleri (13,499 ind., 19.4%) also the biomass dominant species, occuping over 10% of total biomass, was P. herzensteini (2,207 kg, 39.3%), Pleuronectes yokohamae (857 kg, 15.3%), H. pinetorum (761 kg, 13.5%), Kareius bicoloratus (677 kg, 12.1%). From the cluster and MDS analysis based on Bray-Curtis similarity matrix of fourth root transformed data of species number and individuals in the Uljin marine ranching area from Feb. 2008 to Dec. 2010 was divided into two different groups of the flatfishes community in 2008 and from Jan. to Apr. in 2009 and 2010 (Group A) and the pleuronectiform community in from May to Dec. in 2009 and 2010 (Group B). From the cluster and MDS analysis using the similarity of demersal organisms community among six stations, the Uljin marine ranching area was divided into two different groups of Group 1 (St. 1 and St. 3) and Group 2 (St. 2, St. 4, St. 5 and St. 6).