Scale analysis suggests frequent skipping of the second reproductive season in Atlantic herring

G.H. Engelhard, M. Heino

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32 Citations (Scopus)


A common assumption in fish studies is that iteroparous fishes, once mature, normally reproduce in all consecutive seasons. An analysis of scales from Norwegian spring-spawning herring collected between 1935 and 1973 revealed a strong under-representation (47% of expected) of second-time spawners on the spawning grounds. This reduction is not satisfactorily explained by errors in scale-reading, suggesting that the second reproductive season is frequently skipped. Skipping a season may relate to trade-offs between growth, current and future reproduction, and survival, which are likely to be particularly strong for young adult herring.
Original languageEnglish
Pages (from-to)172-175
Number of pages4
JournalBiology Letters
Issue number2
Publication statusPublished - 22 Jun 2005

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