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首页> 外文期刊>ICES Journal of Marine Science >The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period
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The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period

机译：50年崩溃期间冰岛春季产卵鲱鱼的存在和种群连通性

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摘要

In the late 1960s, two local herring stocks and one seasonal migratory herring stock in Icelandic waters collapsed primarily due to overfishing. While the stocks of Icelandic summer-spawning herring (ISSH) and Norwegian spring-spawning herring (NSSH) have recovered, Icelandic spring-spawning herring (ISPH) has not. The main objective of this work is to explore the existence of ISPH and identify potential signs of recovery. Analyses were based on samples from the autumn fishery and survey data from 1962 to 2016. In the autumn, local ISSH and ISPH cohabitated and mixed in the main fishery, where sampled fish were categorized into stocks on basis of maturity stage. The results indicate that the proportion of ISPH was in the range of 13-33% in the 1960s while below 5% and on average 1.4% during 1970-2016. Several year classes of ISPH exhibit notable differences from the general low levels and caused a slight increase in ISPH spawning-stock biomass for corresponding years. An increase in proportion of generally old ISPH around 2004 and 2013 occurred simultaneously with the reappearances of NSSH in the feeding areas east and north of Iceland, respectively. Altogether, it supports earlier suggestions that ISPH might require immigration from NSSH to recover, as these were considered closely related stocks. This is consistent with the source-sink theoretical model of stock size regulation.
机译：在1960年代后期，主要由于过度捕捞，冰岛水域的两批当地鲱鱼种群和一支季节性候群鲱鱼种群崩溃。尽管冰岛夏季产卵鲱鱼（ISSH）和挪威春季产卵鲱鱼（NSSH）的种群已经恢复，但冰岛春季产卵鲱鱼（ISPH）却没有恢复。这项工作的主要目的是探索ISPH的存在并确定潜在的恢复迹象。分析基于秋季渔业的样本和1962年至2016年的调查数据。在秋季，当地的ISSH和ISPH在主要渔业中同居并混合在一起，根据成熟阶段将抽样的鱼类分类为种群。结果表明，ISPH的比例在1960年代为13-33％，而在1970-2016年则低于5％，平均为1.4％。几年类别的ISPH与一般的低水平相比有显着差异，并导致相应年份ISPH产卵生物量略有增加。 NSSH分别在冰岛东部和北部的觅食区出现的同时，在2004年和2013年左右，旧的ISPH比例有所增加。总之，它支持ISPH可能需要从NSSH进行移民才能恢复的早期建议，因为这些被认为是密切相关的股票。这与存量调节的源汇理论模型一致。

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