Variation between Electrofishing and Otter Trawling for Sampling Black Crappies in Two Florida Lakes
Variation between Electrofishing and Otter Trawling for Sampling Black Crappies in Two Florida Lakes
复制标题
佛罗里达州两个湖泊中电捕鱼和水獭拖网捕捞黑鲈鱼样本的差异
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
M. M. Hale
中科院分区：
文献类型：
--
作者：
Timothy F. Bonvechio;William F. Pouder;M. M. Hale
摘要 我们比较了拖网捕捞和电捕捞，以评估佛罗里达州中部两个浅湖中黑斑鲤鱼的种群数量。从 2005 年 11 月到 2006 年 3 月，我们用两种渔具对 Jackson 湖和 Weohyakapka 湖进行了采样。尺寸选择偏差很明显，拖网始终收集总长度 (TL) 小于 100 毫米的小型个体，而电捕捞则收集明显更大、更多的超过 200 毫米 TL 的成鱼。柯尔莫哥洛夫-斯米尔诺夫双样本测试表明，两种渔具捕获的鱼的尺寸结构存在显着差异。两个湖泊的电捕鱼年死亡率估计分别为 28% 和 72%，杰克逊湖水獭拖网的年死亡率为 55%。从两个齿轮得出的渔获量曲线的年龄范围也显示出死亡率估计值的巨大差异，或者根本没有给出死亡率估计值。拖网捕鱼倾向于收集较小年龄组的鱼，而电捕鱼则倾向于收集较大年龄组的鱼；因此，数据列...
Abstract We compared trawling with electrofishing for assessing populations of black crappie Pomoxis nigromaculatus in two shallow central Florida lakes. Lakes Jackson and Weohyakapka were sampled with both gears from November 2005 through March 2006. Size-selective biases were apparent, the trawl nets consistently collecting small individuals less than 100 mm in total length (TL), whereas electrofishing collected significantly larger, more adult fish exceeding 200 mm TL. The Kolmogorov–Smirnov two-sample test indicated that the size structure of the fish captured in the two types of gear differed significantly. The total annual mortality estimates were 28% and 72% for electrofishing on both lakes, 55% for otter trawls on Lake Jackson. The age ranges for catch curves derived from the two gears also displayed large differences in mortality estimates or gave no mortality estimate at all. Trawls tended to collect younger age-classes, whereas electrofishing tended to collect larger age-classes; thus, data col...