Reproductive conditions of walleye pollock Theragra chalcogramma (Gadidae) off the northeastern coast of Sakhalin Island, Sea of Okhotsk

• Published in: Journal of ichthyology Vol. 57; no. 6; pp. 893 - 907
• Main Authors: Tok, Kim Sen, Mukhametov, I. N., Zavarzin, D. S., Chastikov, V. N., Latkovskaya, E. M., Tskhai, Zh. R., Korneev, E. S., Koreneva, T. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2017; Springer Nature B.V
• Subjects: Biomedical and Life Sciences; Chlorophyll; Chlorophylls; Distribution; Dynamics; Eddies; Eggs; Environmental effects; Environmental factors; Freshwater; Freshwater fishes; Gadus chalcogrammus; Inland water environment; Larvae; Life Sciences; Marine fishes; Mesoscale eddies; Mineral nutrients; Nutrients; Phytoplankton; Plankton; Rivers; Spatial distribution; Spawning; Theragra chalcogramma; Zoology; Zooplankton; Sakhalin Island; Sea of Okhotsk; walleye pollock; egg; northeastern Sakhalin; zooplankton; larvae; reproduction; chlorophyll а
• ISSN: 0032-9452; 1555-6425
• DOI: 10.1134/S003294521706008X

The spatial distribution of eggs and larvae of the walleye pollock Theragra chalcogramma is considered in respect to dynamics of oceanologic processes, nutrients, chlorophyll а and zooplankton off the northeastern coast of Sakhalin Island in spring 2012. It is shown that the effect of severe temperature regime in the near-bottom horizons in the western Sea of Okhotsk during the spawning period of walleye pollock becomes milder due to specific features of water dynamics. The egg distribution is determined by mesoscale eddies in the region. The species survival depends on the effect of such environmental factors as freshwater discharge from the Amur River, eddy structure in waters of the Sea of Okhotsk, and dynamics of phytoplankton and zooplankton development.