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장기간 시계열 자료를 활용한 우리나라 참조기(Larimichthys polyactis) 자원의 생태학적특성 변동 분석

Analysis of ecological characteristic variations of small yellow croaker (Larimichthys polyactis) in Korea using long-term time series data

윤상철|강희중|김무진
한국수산해양기술학회 (The Korean Society of Fisheries and Ocean Technology)|2024.08|수산해양기술연구 (Journal of the Korean Society of Fisheries and Ocean Technology)|제60권 제3호|pp. 235-243|DOI 10.3796/KSFOT.2024.60.3.235

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참고문헌

키워드

수산자원관리자원평가참조기Small yellow croakerLength-weight relationshipStock assessmentLength at maturity체장-체장 관계식성숙체장Early maturation
주제분류수산학

초록

수산자원 관리에 있어서 대상 어종의 생태학적특성치를 연구하고 추정하는 것은 매우 중요하다. 생태학적특성치 추정 결과에 따라 자원평가 또는 금지체장, 금어기 등 수산자원관리 기준점이 크게 변한다. 특히 최근에는 어업활동에 의한 과도어획 및 기후변화, 해양오염 등 주변 환경 변화에 따라 생태학적특성이 변화하므로 지속적으로 수산자원의 생태학적특성치를 추정하고 모니터링하는 것이 중요하다. 따라서 본 논문에서는 2000년부터 2023년까지 23년간 우리나라 연근해 참조기 자원에 대한 정밀측정자료를 활용하여 연도별 체장-체중 관계식과 성숙체장(L50, L95)을 추정함으로써 생태특성 변화를 분석하였다. 또한 연도별 자원량을 추정함으로써 수산자원 고갈에 따른 조기성숙 현상을 수치적으로 해석하였다. 그 결과 수산자원의 영양상태를 나타내는 체장-체중 관계식의 매개변수 b는 연도별로 소폭 증가하는 경향을 보였으며, 대부분의 시기에서 영양상태가 비교적 양호한 것으로 판단 되었다(b>3.0). 성숙체장과 자원량 간의 추세 분석 결과, 자원량이 감소함에 따라 성숙체장도 감소하는 것으로 추정되었다.

Abstract

Researching and estimating the ecological characteristics of target fish species is crucial for fisheries resource management. The results of these estimates significantly influence stock assessments and management reference points such as size limit and closed seasons. Recently, ecological characteristics have been changing due to overfishing, climate change, and marine pollution, making continuous estimation and monitoring essential. This study analyzed the ecological changes in small yellow croaker (Larimichthys polyactis) resources in Korea over 24 years (2000-2023) using biological data (growth and gonad traits). By estimating the annual length-weight relationship and length at maturity (L50 and L95), we interpreted the numerical trends of early maturation due to resource depletion. The parameter b of the length-weight relationship, indicating the nutritional status of the resources, showed a slight increase over the years, suggesting relatively good nutritional status (b > 3.0) during most periods. Trend analysis between length at maturity and biomass indicated that as biomass decreased, maturity length also decreased.

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