참전복 방류어장에 출현한 害敵生物의 종조성 및 양적변동

Seasonal fluctuations in abundance species composition of the predatory animals of young abalone, halitos dicus hannai

To determine seasonal fluctuations in abundance and species composition, predatory animals of young abalone, Haliotis discus hannai samples were collected by trammel net from January to December 1997 off Sukbyung in Kyoungsangbuk-do. A total of 1,662 predatory animals were sampled and identified into 49 species, 31 families, 12 orders and 4 phylum. Of the twelve orders, Scorpaniformes, Perciformes, Pleuronectiformes and Tetraodontiforms accounted for approximately 63.39% of the predatory animal fauna in this area. Scorpanidae was dominant representing 5 species. Of 49 species identified, Asterina pectinifera, Ditrema temmincki, Neptunea polycostata, Charybdis japonica, Anthocidaris crassispina, Pugettia quadridens, Hexagrammos otakii, Thammaconus modestus, Hexagrammos agrammus, Hemicentrotus pulcherrimus, Takifugu niphobles and Pleurogrammus azonus accounted for 72.38% of the individuals collected. Paroctopus doflerini, Hexagrammos otakii, Ditrema temmincki, Pleurogrammus azonus, Thammaconus modestus, Hexagrammos agrammus, Conger myriaster, Platycephalus indicus and Halichoeres poecilopterus constituted 84.80% of the total biomass. The number of individuals were larger in spring than in winter. A peak abundance of total individuals occurred in May; the following abundance in June; the lowest abundance in March. The number of species did not showed seasonal variations however, greater biomass was observed from January to March than July to December.