한국 서해에 출현하는 물가자미, Eopsetta grigorjewi의 식성 (Feeding Habits of the Shotted Halibut, Eopsetta grigorjewi in the West Sea from Korea)

서지정보

· 발행기관 : 한국어류학회
· 수록지 정보 : 한국어류학회지 / 36권 / 1호 / 77 ~ 83페이지
· 저자명 : 최동혁, 윤병일, 이수정, 한경호, 권대현

초록

이번 연구는 서해에 서식하는 물가자미의 식성 및 섭이 특성을 밝히기 위해 419마리 중 공위를 제외한 125개체를 분석하였다. 물가자미의 주 먹이생물은 새우류와 어류로 나타났으며, 새우류 중에서는 마루자주새우가, 어류에서는 멸치와 까나리를 가장 많이 섭식하였다. 계절적으로는 서식해역에 풍부한 먹이생물을 주 먹이생물로 섭식하는 기회주의적 섭식자로 나타났으며, 체장이 커질수록 먹이효율을 증가시키기 위해 새우류에서 어류로 주 먹이생물을 변화시켰다.

영어초록

This study conducted to investigate the temporal and spatial variations in the fish community structure in the Seomjin River estuary (ES1~ES3) and Gwangyang Bay (ES4~ES8). Surveys were conducted at eight points between May and September from 2020 to 2021. A total of 5,111 fish were collected, representing 42 families, 68 genera, and 78 species. The dominant species collected during the survey period were Pennahia argentata, with 2,370 individuals and a relative abundance of 46.4%. Also, as a subdominant species, Nuchequula nuchalis, 1643 individuals were caught, accounting for 32.1% relative abundance. According to Bray-Curtis similarities, observations were divided into three groups based on the fish community composition, and they were further categorized into brackish water areas, coastal areas, inner areas, and outer areas. Group 1 mainly consisted of fish inhabiting freshwater and brackish water areas, while group 3 exclusively contained fish living in marine waters. ANOSIM(Analysis of Similarity) analysis revealed a significant difference (ANOSIM R=0.783, p=0.001) between Group 2 and Group 3, and the species contributing to these clusters were P. argentata and Muraenesox cinereus. The study demonstrated spatial changes in the fish community structure from the Seomjin River estuary to the outer coast. The findings highlight the importance of long-term monitoring of major species that exhibit spatial variations, serving as essential foundational data for the conservation and management of economically significant fish species.

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