The experiments were carried out to decide the selective fishing gear of the shrimp beam trawl fishery. The model nets were made of General type, Double-level type and Grid type. The model experiments were carried out to test opening efficiency and towing tension. The experimental tanks were the flume tank〔8.0L×2.8W×1.4H (m)〕and the towing tank〔85L×10W×3.5H (m)〕in National Fisheries Research and Development Institute. The full scale experiments were carried out to compare the selectivity of General type net, Double-level type net and Grid type net in the southern sea of korea.The vertical opening (net height) of the model nets can be expressed as a function of the towing velocity as the straight line. The towing tension of the model nets can be expressed as a function of the towing velocity as the parabola.The shrimp catching rates of upper cod end in Boryeong and tongyeong were 78%, 9% respectively, but the rates of lower cod end were 23%, 91% respectively. The number bycatch rates of General type and Grid type were 23%, 11% respectively, and the weight bycatch rates were 34%, 31% respectively. A selective shrimp beam trawl net is Grid type in korea coastal sea.

• 장충식(경상대학교 해양생산공학과/해양산업연구소) | Choong-Sik JANG (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University, Tongyeong 650-160, Korea)
• 조윤형(경상대학교 해양생산공학과/해양산업연구소) | Youn-Hyoung CHO (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University, Tongyeong 650-160, Korea)
• 안영수(경상대학교 해양생산공학과/해양산업연구소) | Young-Su AN (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University, Tongyeong 650-160, Korea) Corresponding author