Seasonal variations in species composition of catches were explored using seasonal samples caught by shrimp beam trawl in the Geum river estuary in 2011. During the study period, total catches were collected 91 species as fish 47 species, crustacean 28 species, mollusca 4 species, gastropoda 5 species, shellfish 3 species and others 4 species. The dominant species were Exopalaemon carinicauda, Eriocheir leptognathus, Palaemon gravieri, Mugil cephalus, Acanthogobius hasta, Cynoglossus joyneri, Pennahia argentata and Coilia nasus. The amount of species in spring and summer was higher than in autumn. The diversity index (H') was 0.43~0.96, evenness index (EI) was 0.14~0.25, and richness index (RI) was 1.54~4.25. Using cluster analysis 91 species were divided into 4 groups. Group I appeared mainly in spring and summer. Group II appeared only in summer. Group III appeared in winter and spring, and Group IV in spring and autumn.

• 이선길 | Sun-Kil LEE
• 최문성 | Moon-Seong CHOI
• 서영일(국립수산과학원 남서해수산연구소) | Yeong-Il SEO (Fisheries Resources and Environment Division, Southwest sea Fisheries Research Institute, NFRDI, Yousu 556-823, Korea)
• 이재봉(국립수산과학원 남서해수산연구소) | Jae-Bong LEE (Fisheries Resources and Environment Division, Southwest sea Fisheries Research Institute, NFRDI, Yousu 556-823, Korea) Corresponding author