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과학어군탐지기를 이용한 노무라입깃해파리(Nemopilema nomurai)의 분포 밀도 추정

Density estimation of giant jellyfish (Nemopilema nomurai) using a scientific echosounder

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참고문헌

키워드

주제분류수산학

초록

본 연구에서는 2023년에 우리나라 해역에서 출현하는 대형 해파리의 분포 밀도를 파악하고, 2020년도부터 2023년도까지 대형 해파리의 출현량을 비교 분석하였다. 5월에 분포하는 대형 해파리는 주로 양자강 유출수가 유입되는 해역에서 분포하였고, 7월에는 제주 서쪽 및 우리나라 남해안 부근에서 높은 밀도를 나타내었다. 4년간의 분포 밀도를 비교해 보았을 때, 음향조사와 목시조사 결과 모두 2021년도 해파리의 분포 밀도가 가장 높게 나타났다. 매년 표층 부분의 평균 염분을 비교해 보았을 때, 2021년 1월부터 5월까지의 표층에서 평균 염분이 가장 높게 나타났으며, 이는 어린 개체의 노무라입깃해파리가 염분의 농도가 증가할수록 먹이 섭식에 의한 성장과 개체 수 증가에 영향을 주는 것이라고 사료된다. 하지만, 성체로 성장한 이후의 해파리는 수온과 염분의 제약을 크게 받지 않으므로 추후 다른 해양환경 자료와 비교하여 분석할 필요가 있다.

Abstract

In this study, we estimated the distribution density of giant jellyfish in coastal waters of Korea in 2023 and compared the occurrence of giant jellyfish over four years. In May, the giant jellyfish were mainly distributed in the waters of the Yangtze River outflow, and in July, they were highly distributed in the west of Jeju Island and near the south coast of Korea. In addition, when comparing the distribution densities of giant jellyfish in Korea over four years, both acoustic and sighting surveys showed that the highest density of jellyfish occurred in 2021.

참고문헌 (23)

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