管理Centrarchid渔业在河流和小溪BOB国际体育

剥削的小嘴鲈鱼选择密苏里州的溪流和模拟更高的最小长度限制的影响

克里斯•威廉姆森尼克Girondo保罗•Cieslewicz Dave Knuth麦克里德,约翰•Ackerson A.J.普拉特,莎拉•佩珀和Jen Girondo

doi:https://doi.org/10.47886/9781934874523.ch7

抽象的。垂钓者小嘴鲈鱼的收获和人口特征Micropterus dolomieu评估通过electrofishing调查和标签与奖赏3027条鱼标签在6个地点5欧扎克流。增长、开发、和死亡率估计为每个站点。预测人口应对更高的长度限制使用渔业分析和建模仿真软件模拟。标签返回率介于37%和64%之间,垂钓者释放率介于63%和94%之间,和年度开发介于5%和26%之间。中位数时间一份标签返回一年内的标记范围从22岁到47 d标签日期。增长速度相对较慢,平均达到305毫米时间是4.9年,平均达到381毫米时间是7.8年。每年总死亡率估计范围从37%到55%。一年一度的自然死亡率估计范围从13%到33%。预测更高的长度限制的反应差异很大的网站,因为估计的差异率函数。虽然模拟预测小幅增加鱼(0.54 - -2.73 / 100新兵> 381 mm)较大的鱼的数量与381毫米长度限制在6个地点五,预测增加大量(17鱼/ 100新兵> 381 mm)和产量增加6%,当前River-Powder制造现场。 Individuals in the Current River-Powder Mill site were not reaching their full growth potential due to growth overfishing, while simulations of the remaining five populations indicated no growth overfishing under current conditions and regulations. The combined effects of natural mortality and slow growth limited the effectiveness of higher length limits. Under most conditions, the statewide length limit of 305 mm was adequate to balance the desire of quality fishing and harvest opportunities on most Ozark streams. Our study indicates that fisheries at select stream reaches may be improved by higher length limits where exploitation is high, growth is adequate, and natural mortality is low.