한국 연근해에 출현하는 태평양참다랑어 Pacific bluefin tuna, Thunnus orientalis 의 식성
Feeding habits of the Pacific bluefin tuna, Thunnus orientalis in Korean waters
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초록
한국 연근해에 출현하는 태평양참다랑어의 식성을 분석하기 위해 2012년 부터 2017년 까지 대형선망어업에서 어획된 샘플을 분석하였다. 샘플은 총 1,274개체이고 가랑이체장(FL)의 범위는 34.6~218.0cm였다. 미성숙개체(91.4cm이하) 의 먹이생물중요도는 어류, 두족류, 난바다곤쟁이순이었으며 성숙개체는 두족류, 어류 순이었다. 체장크기군별 먹이생물 중요도는 30~89cm 크기군에서는 어류가 우점하였고, 90~179cm 크기군에서는 두족류가 우점하였고, 180cm 이상 개체에서는 어류가 우점하였다. 계절별 먹이생물 중요도는 봄철에는 두족류가 우점하였고, 여름, 가을, 겨울철은 어류가 우점하였다. 해역별 클러스터 분석을 실시한 결과 어류가 우점하는 지역, 두족류가 우점하는 지역, 난바다곤쟁이류가 우점하는 지역으로 나눌수 있었다.
Abstract
The feeding habits of Pacific bluefin tuna, Thunnus orientalis were analyzed using samples by large purse seine fishery in Korean waters from 2012 to 2017. The number of samples was 1,274 and the fork-length (FL) ranged from 34.6 to 218.0 cm. According to %IRI, the Important main prey items of immature individuals (below 91.4 cm in FL) were Pisces, Cephalopoda and Euphausiacea and those of mature individuals were Cephalopoda and Pisces. T. orientalis showed ontogenetic changes in prey item that Pisces was dominated in size class of 30-89 cm (FL), Cephalopoda in 90-179 cm (FL), and Pisces above 180 cm. As for seasonal changes in prey item, Cephalopoda was dominant in spring and Pisces was dominant in summer, autumn and winter. %F, %N, %W and %IRI cluster analysis divided area into three groups: Group A was dominated by Pisces; Group B was dominated by Cephalopoda, and Group C was dominated by Euphausiacea.
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