| 不同尺寸网目与缩结系数对许氏平鲉的选择性 |
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| 引用本文： | 唐衍力,张武浩,刘岳,刘长东.不同尺寸网目与缩结系数对许氏平鲉的选择性[J].中国水产科学,2019,26(3):586-591. |
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| 作者姓名： | 唐衍力 张武浩 刘岳 刘长东 |
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| 作者单位： | 中国海洋大学水产学院, 山东 青岛 266003 |
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| 基金项目： | 山东省海洋与渔业科技创新项目（2017HYCX007）. |
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| 摘 要： | 为探究不同尺寸网目及缩结系数对许氏平鲉(Sebastesschlegelii)的选择性,本研究基于实验水槽中的套网法试验,测得许氏平鲉的生物学特征参数,采用Logistic模型曲线拟合得到不同尺寸网目及缩结系数对许氏平鲉的选择性曲线,并用极大似然法估算选择性参数。结果表明:网目尺寸为63 mm、82 mm、93 mm时,许氏平鲉的50%选择性体长(L50)分别为18.49 cm、23.90 cm、25.12 cm,选择范围(SR)分别为3.18、3.6、3.85,选择因素(SF)分别为2.93、2.91、2.70,随着网目尺寸的增大,许氏平鲉的L50、SR逐渐增大, SF逐渐减小;当82 mm网目的缩结系数(Et)分别为0.5、0.6、0.707时,许氏平鲉的50%选择性体长(L50)分别为21.47 cm、23.90 cm、22.02 cm,选择范围(SR)分别为3.23、3.6、3.38,选择因素(SF)分别为2.65、2.91、2.68,随着网目缩结系数的增大,许氏平鲉的L50、SR、SF先增大后减小,在Et为0.6时均达到最大。为保护许氏平鲉幼鱼资源,建议在鱼礁区使用网目规格为70 mm, Et为0.6的笼壶渔具进行采捕。
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| 关 键 词： | 许氏平鲉 网目尺寸 缩结系数 选择性 |
| 修稿时间： | 2019/5/16 0:00:00 |
Selectivity of fish traps with different size mesh and hanging ratio for Sebastes schlegeliis |
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| TANG Yanli,ZHANG Wuhao,LIU Yue,LIU Changdong.Selectivity of fish traps with different size mesh and hanging ratio for Sebastes schlegeliis[J].Journal of Fishery Sciences of China,2019,26(3):586-591. |
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| Authors: | TANG Yanli ZHANG Wuhao LIU Yue LIU Changdong |
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| Institution: | College of Fisheries, Ocean University of China, Qingdao 266003, China |
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| Abstract: | Sebastes schlegeliis, which occurs in the coastal waters of China, including the Yellow and East China Seas, is a delicious seafood and has great economic value. In the past few years, S. schlegeliis resources have rapidly declined, as a result of the use of a smaller net mesh sizes of the fishing gear, which has resulted in large numbers of fish fry being caught. To better develop and protect resources, the goal of this study was to determine the differences in selectivity of various mesh sizes and hanging ratios for Sebastes schlegelii. The biological features of Sebastes schlegeliis were collected by using a simulated cover-net method in a flume tank. A logistic curve was fitted as a selectivity model to obtain selective curves of different mesh sizes and hanging ratios. Selective parameters were estimated by MLE (Maximum Likelihood Estimate). The results indicated that the selection length (L50) were 17.81 cm, 23.90 cm, and 25.12 cm for Sebastes schlegelii when the mesh sizes were 63 mm, 82 mm, and 93 mm. Selection rangers (SRs) were 2.05, 3.6, and 3.85, and selection factors (SFs) were 2.83, 2.72, and 2.70, respectively. The SR increased with an increase in the mesh size, whereas the SF decreased. When three groups of hanging ratios (0.5, 0.6, and 0.707) for 82 mm mesh size were chosen to study the impact of hanging ratios, the respective of L50s were 21.47 cm, 23.90 cm, and 22.02 cm, SRs were 3.23, 3.6, and 3.38, and SFs were 2.65, 2.91, 2.68, respectively. With an increase in the hanging ratio of meshes, the L50, SR, and SF increased first and then decreased, and obtained a maximum value at the hanging ratio of 0.6. It was concluded that the suitable size of fishing gear for protecting masked greenling resources was a 7 cm mesh size and a hanging ratio of 0.6. |
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| Keywords: | Sebastes schlegelii mesh size hanging ratio selectivity |
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