【摘要】 当网囊网目分别为 40mm、45mm和 5 0mm时 ,哈氏仿对虾的 5 0 %选择体长分别为85 .88、90 .2 6、95 .32mm ;中华管鞭虾的 5 0 %选择体长为 87.5 8、88.0 9、92 .5 6mm ;鹰爪虾的 5 0 %选择体长为 85 .0 4、85 .96、88.32mm。三种虾类的 5 0 %选择体长 (L0 .5)和网囊网目内径 (Me)的线性回归方程为 ,哈氏仿对虾 :L0 .5=48.0 3+0 .94Me ;中华管鞭虾 :L0 .5=67.0 +0 .498Me ;鹰爪虾 :L0 .5=71.68+0 .32 8Me ;三种虾混合 :L0 .5=60 .5 9+0 .636Me。在实际应用中 ,将网囊网目大小由现在的 2 0～30mm提高到 35～ 40mm是有必要的。在此网目大小的范围内 ,哈氏仿对虾、中华管鞭虾、鹰爪虾的5 0 %选择体长分别为 80 .93～ 85 .63mm、84.43～ 86.92mm、83.16～ 84.8mm。更多还原

【Abstract】 Experiments showed that the 50% retention length (L0.5 ) increased with the mesh size of cod end. When the mesh size of cod end increased from 40mm to 50mm with 5mm intervals, 50% retention lengths (L 0.5 ) were 85.88, 90.26, 95.32mm for Parapenaeopsis hardwickii, 87.58, 88.09, 92.56mm for Solenocera crassicornis and 85.04, 85.96, 88.32mm for Trachypenaeus curvirostris respectively. The relations between the mesh size of the cod end and 50% retention length of the three species mentioned above can be described as follows: 80.93～85.63mm、84.43～86.92mm and 83.16～84.8mm respectively, and 82.85～86.03mm If the three main shrimp species were mixed up.It will help to release juvenile shrimps and fish and in the meanwhile improve the size and quality of shrimp catch.更多还原