Klovach N.V.,Federal Russian Research Institute of Fisheries and Oceanography VNIRO |
Roi V.I.,Federal Russian Research Institute of Fisheries and Oceanography VNIRO
Journal of Ichthyology | Year: 2010
Results of study of sock-eyed salmon Oncorhynchus nerka from the Apuka River-the largest river of the northeast of Kamchatka-inflowing Olyutorskii Bay of the Bering Sea are presented. It is established that the school of the Apuka River is represented by the early-run sock-eyed salmon that spawns in Lake Vatyg-Gytkhyn located in the lower part of the basin and by individuals of the later run that spawn in the upper reaches of the river. Early-run sock-eyed salmon appears in the river with signs of spawning changes and a high value of gonadosomatic index (GSI). Late-run sock-eyed salmon migrates to the river without signs of spawning changes and with a relatively low GSI. The age composition of spawners of the early- and late-run sock-eyed salmon is different. © 2010 Pleiades Publishing, Ltd.