한국 동해 남부 고리 주변해역에 출현하는 어류의 종조성과 생식생태

Abstract

To investigate the species composition and reproductive ecology of fishes in the coastal waters off Gori, fish samples were collected by an otter trawl and three side fyke net between January and December 2006. During the study period, 77 species from 51 families and 15 orders were collected by otter trawl, whereas 59 species from 35 families and 9 orders were collected by three side fyke net. The three side fyke net was suitable for collecting pelagic fishes, while otter trawl was for mid-water and demersal fishes. Dominant species were divided into 3 groups. The first group occurred during all season, and they also divided 3 sub-groups. The species of second group was higher from spring to summer and the other one was from autumn to winter. For fish eggs and larvae, 1 species and unidentified fish eggs, and 23 species, 4 families and unidentified fish larvaes were collected by RN 80net. The common fish egg and larvae species was Engraulis japonicus. Each fish larvae species occurred different times. The dominant species was divided 4 spawning group with monthly GSI variation; spring spawner, spring-summer spawner, summer-autumn spawner and winter spawner. The spring spawner was composed of Lophius litulon and Coelorinchus multispinulosus, the spring-summer spawner was composed of Engraulis japonicus, Konosirus punctatus and Pseudorhombus pentophthalmus, the summer-autumn spawner was composed of Trachurus japonicus, Apogon lineatus and Acropoma japonicum, the winter spawner was composed of Clupea pallasii, Liparis tanakai and Limanda yokohamae. Relationships between egg diameter and relative fecundity were three spawning strategies. Clupea pallasii, Lophius litulon, Liparis tanakai and Coelorinchus multispinulosus produce the largest mature eggs and the smallest clutches. Acropoma japonicum, Engraulis japonicus and Pseudorhombus pentophthalmus has small eggs and highest relative fecundity. Apogon lineatus and Limanda yokohamae produce several small clutches of small eggs. These species also have different spawning strategies such as mouthbrooding strategy (Apogon lineatus) and adhesive eggs (Limanda yokohamae). The common fish species have been coexisted with avoidance of interspecific competition; come species were different spawning strategies for same spawning periods. These patterns also occurred with their feeding strategies which the species fed highly diverse prey organisms at same periods.