한국 남해에서 출현하는 성대(Chelidonichthys spinosus)의 위내용물 조성과 영양단계
Diet composition and trophic level of bluefin searobin, Chelidonichthys spinosusin the South Sea of Korea
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2022년 2월, 4월, 5월, 8월, 11월에 남해 19개의 해구 에서 저층트롤어구를 통해 총 397개체의 성대를 채집하 였고, 채집된 성대의 위내용물 조성과 영양단계를 분석 하였다. 성대의 주 먹이생물은 새우류(Macrura)였으며, 그 외에 갯지렁이류(Polychaeta), 게류(Brachyura) 등을 섭식 하였지만 상대적으로 그 양은 많지 않았다. 성장에 따른 위내용물 조성 변화를 분석한 결과, 성대는 성장함 에 따라 새우류의 섭식비율은 감소하였고, 게류와 갯가 재류(Stomatopoda)의 섭식비율은 증가하였다. 성대의 평균 영양단계 값은 3.57±0.58로 나타났으며, 성대는 남 해 연안에 출현하는 새우류를 비롯한 하위 영양단계 생 물과 어류를 주로 섭식하는 최상위 포식자 사이를 연결 시켜주는 중간 영양단계의 생물인 것으로 판단된다. 성 대의 크기군별 개체당 평균 먹이생물 및 먹이생물 중량 을 확인한 결과, 성장함에 따라 평균 먹이생물의 중량이 증가하였으며, 이는 성대가 성장함에 따라 더 많은 에너 지를 축적하기 위해 먹이생물의 중량을 늘리는 것으로 판단된다.
Abstract
The diet composition of bluefin searobin, Chelidonichthys spinosus was studied using 397 specimens collected by fisheries resources survey vessels bottom trawls of national institute of fisheries science in February, June, May, August and November 2022 from nineteen areas in the South Sea of Korea. The species ranged from 9.7 cm to 42.0 cm in total length (TL). C. spinosus was bottom-feeding carnivore that fed mainly on Macrura, which constituted 85.7% of %IRI, especially Leptochela sydniensis. The proportion of Macrura decreased inversely proportional to body size, whereas the consumption of Brachyura and Stomatopoda increased gradually. With the increase in body size of C. spinosus, a significant rise in the mean weight of prey per stomach (mW/ST) was observed (one-way ANOVA, P<0.05).
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