Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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A Study of Growth and Age Structure for Chub Mackerel, Scomber japonicus Caught by a Large Purse Seine in the Korean Waters

한국 주변해역에서 대형선망으로 어획한 고등어(Scomber japonicus)의 성장과 연령구조 연구

  • Jung, Kyung-Mi (South Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Heeyong (South Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kang, Sukyung (Fisheries Resources Management Division, National Institute of Fisheries Science)
  • 정경미 (국립수산과학원 남해수산연구소 자원환경과) ;
  • 김희용 (국립수산과학원 남해수산연구소 자원환경과) ;
  • 강수경 (국립수산과학원 연근해자원과)
  • Received : 2020.11.20
  • Accepted : 2021.04.07
  • Published : 2021.06.30
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Abstract

We examined the growth and age structure for chub mackerel caught by a large purseseine in the Korean waters from January to December 2015. A total of 459 specimens were used for otolith analysis, ranging from 19.6 cm to 46.0 cm in fork length. Translucent zone was regarded as an annual mark, and age was counted using the information of the number of translucent zone, capture date, edge type of the otolith and nominal birthdate of 1 January. Annuli in otoliths were mainly formed in May, coinciding with the spawning season. Estimated ages were 0~6 years, and the von Bertalanffy growth models were not significantly different between male and female. Sex-combined growth model was obtained as FLt=39.3×{1-exp[-0.90×(t+0.033)]}. Among the chub mackerel caught in 2015, the age 2 group had the highest proportion (30.9%), and the age 0 to 2 group accounted for 88.5% of the total catch.

본 연구는 2015년 1월부터 12월까지 한국 주변해역에서 대형선망어업으로 어획된 고등어의 성장과 연령구조를 분석하였다. 연령분석을 위해 총 459개의 이석이 사용되었고, 가랑이체장의 범위는 19.6~46.0 cm였다. 연령은 투명대의 수, 채집일, 이석 가장자리 형태, 1월 1일의 명목생일에 대한 정보를 이용하여 판독하였다. 윤문은 고등어의 산란시기인 5월에 형성되었다. 연령은 0세부터 6세까지 추정되었고, von Bertalanffy 성장식은 성별 간 유의한 차이가 나타나지 않았다. 암컷과 수컷을 모두 합한 성장식은 FLt=39.3×{1-exp[-0.90×(t+0.033)]}으로 도출되었다. 2015년 대형선망 어획물의 연령구조를 살펴본 결과, 2세군의 어획비율이 30.9%로 가장 높았고, 0~2세군은 전체 어획물의 88.5%로 대부분을 차지하였다.

Keywords

Acknowledgement

본 논문은 국립수산과학원 수산과학연구사업인 '남해 연안어업 및 환경생태 조사(R2021034)'의 지원으로 수행되었으며, 논문의 질적 완성도를 높여주신 세 분의 심사위원분께 진심으로 감사의 인사를 드립니다.

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