Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Species Compositon and Seasonal Variations of Fishes Collected by Winged Stow Nets on Anchors off Namhae Island

남해도 연안해역에서 낭장망에 의해 어획되는 어류의 종조성 및 계절변동

  • Published : 1998.09.01
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Abstract

Species composition and seasonal variations of fishes collected by winged stow net on anchors in the coastal water off Namhae Island was studied from May 1989 m April 1990. During the study period, a total of 56 fish species were collected. Engraulis japonicus, Conger myriaster, Trichiurus lepturus, Sardinella zunasi, Ammodytes personatus, and Thryssa kammalensis predominated. These six species accounted for 93.9% of the total number and 81.3% of the total biomass of fishes collected. Fishes collected by winged stow nets on anchors were primarily small fish species or early juveniles of large fish species. Both abundance and species composition of fishes changed with season. Seasonal peaks of number of species occurred in spring and fall, while those of number of individuals and biomass occurred in spring. The lowest number of individuals and biomass were observed in winter. Low species diversity indices were observed in summer. These low diversity indices in summer were mainly due to predominance of E. japonicus which accounted for approximately 90% of all fishes collected. More species and greater biomass were collected during nighttime.

경남 남해도 연안해역에서 조업중인 낭장망에 의해 채집되는 어류의 종조성 및 계절 변동을 조사하기 위해서 1989년 5월부터 1990년 4월까지 1년간 매달 어류를 채집하였다. 낭장망에 의해 채집된 어류는 총 56종이었다. 멸치가 가장 많이 어획되었으며, 그 다음으로 붕장어, 갈치, 밴댕이, 청멸이 많이 어획되었다. 이들 6어종은 채집된 어류 총 개체수의 93.9%와 총 어획량의 73.8%를 차지하였다. 본 조사해역에서 채집된 어류의 대부분은 10cm 이하의 작은 체장을 지닌 소형 어종이거나, 대형 어종의 유어로 구성되어 있었다. 낭장망에 의한 어확물은 뚜렷한 계절변동을 보였다. 채집어종수는 봄과 가을에, 채집 개체수와 생체량은 봄에 높은 값을 보였다. 그러나 겨울에는 채집 개체수 및 생체량이 매우 낮은 값을 보였다. 종다양도지수는 여름에 가장 낮은 값을 보였는데, 이 시기에 멸치가 총 개체수의 90% 이상을 차지하였다. 낮과 밤의 어획량을 비교한 결과, 밤 동안에 더 많은 어종수 및 생체량이 채집되었다.

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