A biological assessments of fish community structure were carried out in the lower reach of Seomjin River from May 2009 to November 2010. The collected fish from the six surveyed sites were 63 species belonging to 24 families, and 10 orders. Although species was different depending on sites, the numbers of individuals were not shown significance on sites. Locational dominant species were different. For example, the dominant species on May were Zacco platypus at W-1, Zacco temminckii at W-2, Acanthogobius flavimanus at W-3 and W-4, and Leiognathus nuchalis at W-5 and W-6. There is no seasonal differences in species. Species diversity was the best up to 2.64 on May at W-1 from 1.33 on November at W-6. As a result of an analysis about environmental factors for the numbers of fish species and individuals in each surveyed sites, the most effective groups were DO, BOD, and COD. The proportional difference was high on May than November between transient and asymptotic projections for population size and population growth rate for simulations starting at the current or theoretical stage distribution.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 조사 지점 및 조사 시기
  2.2. 채집 및 동정
  2.3. 생물지수(Biotic Indices) 산출
  2.4. 어류의 생태에 미치는 먹이 조사
  2.5. 어류의 생태에 미치는 환경
  2.6. 환경영향 분석
 3. 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 허만규(동의대학교 분자생물학과) | Man-Kyu Huh (Department of Molecular Biology, Dongeui University)
• 서정윤(창원대학교 환경공학과) | Jeoung-Yoon Seo (Department of Environmental Engineering, Changwon National University) Corresponding author
• 주우홍(창원대학교 생물학과) | Woo-Hong Joo (Department of Biology, Changwon National University)