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Research article - Peer-reviewed, 2021

A combination of genetic and phenotypic characterization of spring- and autumn-spawning herring suggests gene flow between populations

Berg, Florian; Ostgaard, Hedda D.; Slotte, Aril; Andersson, Leif; Folkvord, Arild


Atlantic herring (Clupea harengus) has complex population structure and dynamics including diverse life histories and spawning times with spring and autumn spawning as the most common modes. Originally, spawning herring were phenotypically identified based on their maturity development or otolith microstructure by determining seasonal specific larval growth patterns. Recently, genetic markers have revealed clear genetic differentiation between spring- and autumn-spawning populations. All three methods were applied to herring caught at the same locations during spring and autumn to determine the coherence of methods. In a selected subset, most herring (similar to 77%) had an otolith microstructure and genetic assignment coinciding with the phenotypically assigned spawning season. Non-spawning herring (<5%) that were classified as belonging to the current spawning season using genotyping and otolith-typing were assigned as skipped spawners. For similar to 8% of spawning herring, the genetic and otolith assignment contradicted the phenotypically assigned spawning season, characteristic of straying individuals. Otolith-typing contradicted the genetic and phenotypical assignment in similar to 7% of the cases, potentially representing individuals reuniting back to the spawning season favoured by their genotype. Although the viability of offspring from these individuals remains undocumented, it is suggested that the observed switching of spawning season may contribute to gene flow between herring populations.


otolith microstructure; population discrimination; phenotypic plasticity; population structure; skipped spawning; SNP

Published in

ICES Journal of Marine Science
2021, volume: 78, number: 2, pages: 694-703

Authors' information

Berg, Florian
University of Bergen
Berg, Florian
Institute of Marine Research - Norway
Ostgaard, Hedda D.
University of Bergen
Slotte, Aril
Institute of Marine Research - Norway
Texas AandM University College Station
Andersson, Leif
Texas A&M University
Andersson, Leif
Swedish University of Agricultural Sciences, Department of Animal Breeding and Genetics
Andersson, Leif
Uppsala University
Folkvord, Arild
University of Bergen

UKÄ Subject classification

Fish and Aquacultural Science

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