Contents

Journal of Ichthyology

Vol. 66, No. 1, 2026

Otolith Morphology Resolves Taxonomic Ambiguities in Four Freshwater Minnows (Cyprinidae)

L. Yasmeen, M. Sadiq, I. Hassan, S. Salman, A. M. Mir, and M. A. Khan p. 1  abstract

Ichthyofauna of the Kara River Basin

V. I. Ponomarev p. 13  abstract

Northward Expansion of Volga Pikeperch Sander volgensis (Percidae) in the Kama River Basin

P. B. Mikheev, S. N. Kazarinov, and F. Taddese p. 26  abstract

Range Expansion of the Vulnerable Piabanha Brycon dulcis (Bryconidae) to the Upper Doce River Basin, Brazil

R. R. Costa, C. E. Assis, G. R. Fernandes, L. M. Ramos, K. L. Souza, V. de Queiroz, and E. Henschel p. 32  abstract

First Record of Three Snake Eels (Ophichthidae) from the Arabian Sea

R. K. Behera, S. R. Mohanty, S. Beura, K. K. Bineesh, and A. Mohapatra p. 39  abstract

Distribution and Comments on the Biology of the Wattled Eelpout Lycodes palearis (Zoarcidae) in the Southwestern Part of the Bering Sea in the Summer–Autumn Period

Yu. K. Kurbanov and A. A. Balanov p. 47  abstract

Distribution and Size Composition of Whip Sculpin Gymnocanthus intermedius (Cottidae) in the Waters of Primorye (Sea of Japan) in Summer

V. V. Panchenko and A. N. Vdovin p. 61  abstract

Siberian Sucker Catostomus catostomus rostratus (Catostomidae) in the Lake–River Systems of the Southern Spurs of the Chersky Range

E. V. Khamenkova, M. B. Skopets, S. I. Grunin, and V. V. Pospekhov p. 69  abstract

Changes in Biological Characteristics of the Anadyr Nelma Stenodus nelma (Salmonidae) in 2000–2022

A. V. Shestakov p. 81  abstract

Growth of the European Whitefish Coregonus lavaretus (Salmonidae) in Lake–River Systems of the Extreme Northeast of European Russia

E. I. Boznak and V. I. Ponomarev p. 88  abstract

Histological Studies of Japanese Sardine Sardinops melanosticta (Alosidae) and the Japanese Anchovy Engraulis japonicus (Engraulidae) Gonads in Relation to their Stock Fluctuations

K. A. Zhukova, P. O. Emelin, A. V. Sogrina, and V. A. Belyaev p. 101  abstract

Reproductive Biology of Male Blackhand Paradise Fish Polynemus melanochir (Polynemidae) from Southwestern Vietnam

L. T. T. Vo, A. N. Tran, T. T. H. Lam, G. H. Phan, T. H. D. Nguyen, and Q. M. Dinh p. 110  abstract

Testicular Morphology and Histology, Sperm-Releasing Pattern, and Size at First Maturation of Congaturi Halfbeak Hyporhamphus limbatus (Hemiramphidae) in Southwest Vietnam

V. Q. Nguyen, V. V. Ly, P. L. H. Nguyen, L. T. C. Tran, Q. L. Nguyen, and Q. M. Dinh p. 120  abstract

Feeding Habits and the Trophic Level of the Fat Greenling Hexagrammos otakii (Hexagrammidae) off the Gangneung Coast of Korea

D. J. Kim, H. J. Jo, J. K. Yoon, G. B. Kim, J. M. Ahn, and G. W. Baeck p. 128  abstract

Genetic Variability of the Asian Rainbow Smelt Osmerus dentex (Osmeridae) in the European Northeast Russia Based on DNA Microsatellite Loci Analysis

A. V. Semenova, G. V. Fuks, and V. S. Sherstkov p. 140  abstract

Differentiation of the Endemic Salvelinus Fauna from the Kronotskoe‒Uzon Catchment (Kamchatka) Based on DNA Microsatellite and Cytochrome b Markers

E. V. Esin, N. O. Melnik, G. N. Markevich, D. A. Medvedev, D. M. Panicheva, and L. S. Zinevich p. 157  abstract

Morphoecological Approach to the Study of Intraspecific Structure of Greenland Halibut Reinhardtius hippoglossoides (Pleuronectidae) in the Sea of Okhotsk

O. Z. Badaev and V. V. Kulik p. 168  abstract

SHORT COMMUNICATIONS

Species Composition of Scaly-Headed Gunnels (Pholidae) in Russian Waters

M. O. Rostovtseva, B. A. Sheiko, and A. A. Balanov p. 182  abstract

A New Finding of a Rare Species in Russian Waters, Wonder Dragonet Draculo mirabilis (Callionymidae)

E. D. Vasil’eva and E. A. Dunaev p. 188  abstract

Cleaning Activity of Monodactylus argenteus (Monodactylidae) at an Australian Urban Estuary: The Concept of Periodic Cleaner

I. Sazima p. 194  abstract