We examined monthly changes in the rate of fishes by-caught by gape net with wings and their immature ratio in thecoast of Yeosu and Jindo Island, Korea. A minus correlation between bycatch rate, the ratio of fishes except for anchovy, Engraulis japonicus, to all fishes collected by gape net with wings, and individuals of the collected anchovy was significantly observed, implying that as the anchovy catch decreased and the bycatch rate increased. Immature ratios by the dominant bycatch species during the study is the following; Leiognathus nuchalis was 72.7~99.0%, Sphyraena pinguis was 84.0%, Sardinella zunasi was 90.0%, others (Leptocephalus, Trichiurus lepturus, Ammodytes personatus, Sphyraena pinguis, Trachurus japonicas, Mugil cephalus and Erisphex pottii) were 100.0%. In order to decrease the high bycatch rates of immature fishes in spring and autumn, our study suggested increasing of codend mesh size and developing suitable bycatch reduction devices in a gape net with wings.

• 유준택(국립수산과학원 남해수산연구소) | Joon-Taek YOO (South Sea Fisheries Research Institute, National Fisheries Institute of Fisheries Science, Yeosu 59780, Korea) Corresponding author
• 김영혜(국립수산과학원 남해수산연구소) | Yeong Hye KIM (South Sea Fisheries Research Institute, National Fisheries Institute of Fisheries Science, Yeosu 59780, Korea)
• 송세현(국립수산과학원 남해수산연구소) | Se Hyun SONG (South Sea Fisheries Research Institute, National Fisheries Institute of Fisheries Science, Yeosu 59780, Korea)
• 박성욱(국립수산과학원 남해수산연구소) | Seongwook PARK (South Sea Fisheries Research Institute, National Fisheries Institute of Fisheries Science, Yeosu 59780, Korea)