Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Temporal Variation in Species Composition and Abundance of Fish Assemblages in Masan Bay

마산만 해역에서 서식하는 어류군집의 종조성 및 출현량 변동

  • Received : 2007.04.30
  • Accepted : 2007.05.18
  • Published : 2007.06.30
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Abstract

A total of 27 fish species were collected by a gill net in Masan Bay. The dominant fish species were Konosirus punctatus, Mugil cephalus, Engraulis japonicus, Psenopsis anomala, Lateolabrax japonicus, Leiognathus nuchalis, Chelon affinis, Trachurus japonicus, and these accounted for 87.6% of the total numbers. The numerically dominant fish species made up 95.4% of biomass. These were primarily juvenile species or early larger species. Temporal variation in both species composition and abundance was large: the peak number of fishes occurred in March 2005 and July 2005, whilst biomass of fishes was the highest in September 2005 and November 2005. Fish numbers as well as biomass was lowest in November 2005. Temporal changes in the abundance of fishes corresponded with temperature. A gill net can be used as an alternative fishing gear to collect pelagic fishes commercially, although a gill net has a strong selectivity for the target fish species or for size.

마산만 해역에서 유자망을 이용하여 어류군집의 종조성 및 출현량 변동을 조사하였다. 조사기간 동안 총 27종이 출현하였으며, 우점종은 전어(Konosirus punctatus), 숭어(Mugil cephalus), 멸치 (Engraulis japonicus), 샛돔 (Psenopsis anomala), 농어 (Lateolabrax japonicus), 주둥치(Leiognathus nuchalis), 등줄숭어(Chelon affinis), 전갱이(Trachurus japonicus)였는데, 이들 어종은 전체 개체수의 87.6%와 총 생체량의 95.4%를 차지하였다. 어류군집의 종조성 및 출현량 변동이 뚜렷하였는데, 출현 개체수는 2005년 3월과 7월, 생체량은 2005년 9월과 11월에 높게 나타났다. 한편 출현개체수 및 생체량은 모두 2005년 11월에 가장 낮게 나타났다. 수온이 어류군집의 종조성 및 출현량 변동에 가장 큰 영향을 주는 요인이었다. 유자망은 어획대상 어종이나 어획 체장에 강한 선택성을 가지고 있었지만, 상업성어종의 채집에 효율적이었다.

Keywords

References

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