Abstract

An original method is proposed for rapidly differentiating between regional pink salmon runs with different timings of spawning and states of gonads (gonadosomatic indices, GSI). The results of differentiation obtained by the original and traditional methods are compared. The concept of spatial niches for various temporal groups of Sea of Okhotsk pink salmon in Pacific waters off the Kuril Islands is critically revised on the basis of the proposed new method. The existing concept is based on the traditional use of certain numerical markers (GSI) for samples at the sites of trawl hauls. The width of the spatial overlap zone in the distribution of temporal groups is shown. The method was tested using data of trawl surveys conducted aboard the R/V Professor Kaganovsky in May–July 2018, during the anadromous migration of pink salmon. It shows high agreement with the estimates of the proportions of the contribution that the regional pink salmon groups make to the runs and catches according to the official statistics on fishing and the escapement of spawners to rivers. The assumption on the tendency of the late-maturing pink salmon forms to migrate through the southern part of Pacific waters off the Kuril Islands is confirmed. The specific (along transects) and cumulative portion of early-maturing pink has been shown to increase with distance off the Kuril straits into Pacific waters.

中文翻译：

---

基于性体指数的千岛群岛太平洋海域鄂霍次克粉红鲑鱼迁徙种群群区分方法

摘要

提出了一种原始方法，用于快速区分具有不同产卵时间和性腺状态的地方粉红鲑鱼活动（性腺体指数，GSI）。比较了原始方法和传统方法获得的区分结果。在拟议的新方法的基础上，对鄂霍次克海粉红鲑鱼在千岛群岛太平洋水域的各个时间群的空间生态位概念进行了严格的修订。现有的概念是基于传统的使用某些数字标记（GSI）对拖网运输地点的样本进行的。显示了时间组分布中的空间重叠区的宽度。该方法是使用R / V教授卡加诺夫斯基（Kaganovsky）上进行的拖网调查数据进行测试的在2018年5月至7月期间，粉红鲑鱼大量迁徙。根据有关捕鱼和产卵者向河道逃逸的官方统计，它与区域粉红鲑鱼群体对奔跑和捕捞的贡献比例的估计值高度吻合。证实了关于晚熟粉红色鲑鱼形态在千岛群岛以外的太平洋水域南部迁移的趋势的假设。已显示，早熟粉红色的特定（沿样带）和累积部分随离千岛海峡到太平洋水域的距离而增加。