경북 울진 및 충남 태안 해역에서 채집된 자어 종조성의 계절변동

Abstract

Fish larvae were collected every month from January to December 2010 to examine the spawning characteristics of selected fish species in the East Sea of Korea and the Yellow Sea. The seasonal and spatial distributions of larvae in Uljin, Gyeongbook (East Sea of Korea) and Taean, Choongnam (Yellow Sea) were investigated in relation to environmental factors (surface temperature and salinity). A total of 30 taxa of 21 families under six orders were identified in Uljin, Korea, and a total of 37 taxa of 20 families under four orders were identified in Taean, Korea. The number of taxa and individuals in Uljin increased most during the summer and decreased during spring to fall. The number of taxa and individuals in Taean fluctuated substantially between the seasons. A significant correlation was detected between surface temperature and the population number of the dominant species. Larvae of Engraulis japonicus were collected in Uljin from May to October and in Taean from June to September. The abundance of fish larvae also differed, with the greatest number of total individuals collected in July in Uljin, while the most individuals were collected from June to July in Taean. The larvae of Ammodytes personatus, which were collected during winter in both regions, were most abundant in December to March, with the greatest number of individuals collected in January in Uljin, while in Taean they were most abundant from December to April, with the greatest number of individuals collected in February. Moreover, warm-water dwelling fishes such as Halichoeres poecilopterus and Chromis notata, which were not found in Taean, were collected during summer in Uljin, and cold-water dwelling fishes such as Pholis fangi and Liparis tanakai, which were not found in Uljin, were collected during winter in Taean. Throughout the study, spawning seasons for the major dominant species in the East Sea of Korea and Yellow Sea, such as E. japonicus and A. personatus, were similar regardless of the water conditions. However, the spawning season for E. japonicus, which spawn during spring and summer, begins earlier and lasts longer in Uljin compared to Taean. The spawning season for A. personatus, which spawns during winter, lasted longer in Taean compared to Uljin.