Identity and relationships of the landlocked Rossfjordvatn hybrid herring, and other intergrades of Clupea pallasii and C. harengus in Northern Europe

Pacific herring Clupea pallasii and Atlantic herring C. harengus are sister species of Pliocene origin that now both occur in northeastern Europe. Atlantic herring is represented by a huge oceanic population and several small coastal populations in Norway, whereas Pacific herring prevails in the Eas...

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