Size Selectivity of Passive Fishing Gear: A Correction for Encounter Probability Applied to Gill Nets
Size Selectivity of Passive Fishing Gear: A Correction for Encounter Probability Applied to Gill Nets
复制标题
被动渔具的尺寸选择性：刺网遇到概率的修正
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
W. Tonn
中科院分区：
文献类型：
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作者：
L. Rudstam;J. Magnuson;W. Tonn
用刺网捕获鱼的概率可分为两个部分：(1)鱼碰到网的概率和(2)鱼被捕获并留在网中的概率。我们认为遇到的概率与鱼在采样期间所走的距离成正比。如果不同大小的鱼游同样长的时间，这个距离会随着鱼的大小而增加，因为游泳的速度会随着鱼的大小而增加。在实验室测量的三种大小等级的膨胀体（Coregonus hoyi）的常规游泳速度随长度的增加而增加到0.8倍。对与腹胀鱼密切相关的cisco （Coregonus artedii）样本的刺网选择性计算纳入了遇到概率的修正。这些修正可以显著提高估计种群结构中相对于较大动物的较小比例估计值。这种方法也应该适用于其他被动的……
The probability of catching a fish in a gill net may be separated into two components: (1) the probability of the fish encountering the net and (2) the probability of the fish being caught and retained in the net. We consider the probability of encounter to be directly proportional to the distance travelled by the fish during the sampling period. This distance will increase with fish size if different-sized fish swim for the same amount of time because swimming speed increases with fish size. Routine swimming speed measured in the laboratory for three size-classes of bloater (Coregonus hoyi) increased with length to the 0.8 power. Corrections for encounter probability were incorporated in gill net selectivity calculations for samples of cisco (Coregonus artedii), a species closely related to bloater. These corrections can significantly increase the proportional estimates of smaller relative to larger animals in the estimated population structure. The approach should also be applicable to other passive fis...