Species-specific vulnerability to angling and its size-selectivity in sympatric stream salmonids
Species-specific vulnerability to angling and its size-selectivity in sympatric stream salmonids
复制标题
同域溪流鲑科鱼的物种特异性垂钓脆弱性及其尺寸选择性
DOI：
10.1139/cjfas-2020-0428
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发表时间：
2021
影响因子：
2.4
通讯作者：
R Arlinghaus
中科院分区：
文献类型：
--
作者：
J Tsuboi;K Morita;G Sahashi;M Kuroki;S Baba;R Arlinghaus
在捕捞多个鱼种的混合渔业中，为了可持续地管理资源，了解特定鱼种易受捕捞的脆弱性与了解渔具的大小选择性同样重要，甚至更为重要。我们比较了在日本的自然溪流中的四种鲑鱼的诱饵休闲垂钓的脆弱性。物种特异性钓鱼脆弱性的排名如下（从最高到最低）：虹鳟鱼（Oncorhynchus mykiss），马苏鲑鱼（Oncorhynchusmasou），白斑红点鲑（Salvelinus leucomaenis），和南亚多莉瓦登（Salvelinus curilus）。在所有物种中，较大的个体更容易受到钓鱼，但物种之间的大小依赖性存在差异。在虹鳟鱼和多莉瓦登鱼（在研究区有一个nonanadromous生活史），被抓住的概率单调增加与身体的大小，而脆弱性钓鱼在马苏鲑鱼和白斑红点鲑（在研究区有一个溯河产卵的生活史）表现出一个圆顶形的模式。我们发现，在整个物种的单位努力渔获量与人口密度表现出超稳定的关系。因此，不断减少的当地种群很容易崩溃，而这种崩溃很难仅仅根据捕捞率数据来预测。
In mixed fisheries where multiple species are caught, to manage resources sustainably, knowledge about the species-specific vulnerability to fishing is equally or even more important than knowledge of size selectivity of the gear. We compared the vulnerability to bait recreational angling in four salmonid species in natural streams in Japan. The ranking of species-specific angling vulnerability was as follows (from highest to lowest): rainbow trout (Oncorhynchus mykiss), masu salmon (Oncorhynchusmasou), white-spotted char (Salvelinus leucomaenis), and southern Asian Dolly Varden (Salvelinus curilus). In all species, larger individuals were more vulnerable to angling, but there were differences in the size dependence between species. In rainbow trout and Dolly Varden (which have a nonanadromous life history in the study area), the probability of being caught monotonically increased with body size, while the vulnerability to angling in masu salmon and white-spotted char (which have an anadromous life history in the study area) showed a domed-shaped pattern. We found that across the species the catch per unit effort showed a hyperstable relationship with population density. Therefore, diminishing local populations are prone to collapse, and this collapse would be hard to foresee based on catch rate data alone.