Results of otolith marking of chum salmon <i>Oncorhynchus keta</i> for testing efficiency of their artificial reproduction

Abstract

Otoliths from 3473 chum salmon spawners caught at the mouth of Naiba River and at Bereznyakovsky and Sokolovsky salmon hatcheries in 2013–2019 are investigated. Almost all of the chum adults caught at the hatcheries were marked at one of them and obviously migrated toward the point where they were released being the fry. Moreover, the most of chum spawners caught at the mouth of Naiba River also had the mark of either Bereznyakovsky or Sokolovsky hatchery, which definitely contributed a significant portion of the total stock of chum salmon in Dolinsky district of Sakhalin region.

Keywords

• chum salmon
• <i>oncorhynchus keta</i>
• otolith marking
• juvenile
• hatchery
• sakhalin region