The study aims at a selective effect of the Grid and Window net in the shrimp beam trawl.The experimental trawling of the Proto type, Grid type and Grid and Window net type was performed in a sea area of Geo–je and Tong–yeong from Mar, 2006 to Apr, 2010. The obtained results are as follows; Catch per unit area (Number) of the Proto type net and Grid type net were 0.18/m2, 0.23/m2, respectively. The Grid type demonstrated 2.4% lower bycatch rate than the proto type (6.6% vs 4.2%, respectively). In addition, in terms of total weight, the bycatch rate of Grid type was 7.6% lower than the proto type (50.2% vs 42.6%, respectively). In the comparison of shrimp catch, the Proto type demonstrated better haul outcome (0.02 case/m2) than the Grid & Window type (0.02 case/m2). The Grid & Window net type demonstrated 16.4% lower bycatch rate than the Proto type (32.2% vs 48.6%, respectively). In addition, in terms of total weight, the bycatch rate of Grid & Window net type was 8.3% lower than the Proto type (85.9% vs 94.2% respectively).

• 장충식(경상대학교 해양생산공학과/해양산업연구소) | Choong–Sik JANG (Department of Marine Production / Institute of Marine Industry, College of Marine Science, Gyeongsang National University, Cheondaegukchi–Gil 38, Tongyeong 650–160, Korea)
• 조윤형(경상대학교 해양생산공학과/해양산업연구소) | Youn–Hyoung CHO (Department of Marine Production / Institute of Marine Industry, College of Marine Science, Gyeongsang National University, Cheondaegukchi–Gil 38, Tongyeong 650–160, Korea)
• 안영수(경상대학교 해양생산공학과/해양산업연구소) | Young–Su AN (Department of Marine Production / Institute of Marine Industry, College of Marine Science, Gyeongsang National University, Cheondaegukchi–Gil 38, Tongyeong 650–160, Korea) Corresponding author