태안 연안에 출현하는 수산생물의 계절 변동을 알아보기 위해 2010년 4월부터 2011년 1월까지 통발과 자망을 사용하여 상업적 조업에 어획된 어획물의 종조성 및 계절 변동을 분석하였다. 조사기간 동안 총 58종, 10,602개체, 547,569g의 수산생물이 어획되었으며, 어류가 22종, 갑각류가 20종, 복족류가 8종, 성게류가 3종, 두족류와 이매패류가 각각 2종, 해삼류가 1종이었다. 통발에서 9목 22과 41종, 자망에서 15목 22과 28종의 수산생물이 출현하였다. 각시수랑은 통발에서, 홍어는 자망에서 우점하였는데, 이들 2종이 전체 개체수의 73.9%, 생체량의 64.4%를 차지하였다. 계절별 출현 종수는 통발의 경우 봄에, 자망은 가을에 가장 많았다. 개체수와 생체량은 통발의 경우 겨울과 여름에 각각 높았고, 자망은 여름에 높았다. 연안통발어선과 연안자망어선에 의해 서산수협 모항지점에 위판 된 수산생물은 각각 12종과 14종이었다. 전체 출현 개체수 중에서 조사기간 동안 3회 이상 출현한 18종에 대한 종간 집괴 분석을 한 결과, 3개의 그룹으로 구분되었다. A그룹은 봄에 주로 출현한 종, B그룹은 여름과 가을에 주로 출현한 종, C그룹은 조사기간 전체에 걸쳐 우점하여 출현한 종으로 구성되었다.
Species composition and seasonal variation of aquatic organism in the coastal waters off Taean, Korea were investigated using catches by commercial fishing of the pot and gill net from April 2010 to January 2011. A total of 58 species, 10,602 individuals and 547,569g of aquatic organism were collected during the study. Aquatic organism were composed of 22 species of Pisces, 20 species of Crustacea, 8 species of Gastropoda, 3 species of Echinodea, 2 species of Cephalopoda and Bivalvia, and 1 species of Holothuroidea. 41 species in 9 orders and 22 families were collected by the pot, and 28 species in 15 orders and 22 families were collected by the gill net. Volutharpa ampullacea was the most dominant in the pot, while Okamejei kenojei was the most dominant in the gill net. These two species accounted for 73.9% in the number of individuals, and 64.4% in biomass. The number of species was high in spring in the pot, and autumn in the gill net. The number of individuals and biomass were highest in winter and summer respectively in the pot, and summer in the gill net. The number of species of the consignment quantity caught by commercial fishery of the pot and gill net in Mohang was 12 and 14 respectively. Cluster analysis based on species composition of the 18 most common species showed that the species were separated into 3 different group. Group A was composed of species which were abundant in spring, group B was composed of species which were abundant in summer and autumn, and group C was composed of year-round residents.