Original paper

Ultrastructural correlates of acoustic sensitivity in Baikal coregonid fishes

Sapozhnikova, Yulia P.; Belous, Anastasia A.; Makarov, Mikhail M.; Glyzina, Olga Y.; Klimenkov, Igor V.; Yakhnenko, Vera M.; Sukhanova, Lyubov V.

Fundamental and Applied Limnology Volume 189 Nr. 3 (2017), p. 267 - 278

published: Feb 1, 2017

DOI: 10.1127/fal/2017/0810

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Abstract

We investigated the ultrastructure of the sensory saccular and lagenar epithelia of the coregonid fishes: pelagic planktophage Baikal omul (Coregonus migratorius), benthophage lacustrine-riverine whitefish, or Baikal pidschian (C. pidschian), a typical inhabitant of the shallow water of the lake, and their hybrids of the first generation (F1). We made a few suggestions on the possible adaptive significance of ultrastructural specializations to acoustic sensitivity in different species of coregonid fishes. Unlike the shallow-water pidschian, both the pelagic omul and F1 hybrids possess higher morphological diversity of sensory cells. However, sensory cells of pidschian are characterised by sensory bundles with shorter stereocilia that presumably could perceive higher frequency sound oscillations. The saccular orientations are different from the earlier described ones in other whitefishes. The predominance of any direction in the morphological polarization of the sensory macula of different fish species is expected to be attributed to their ecology.

Keywords

morphological polarizationtypes of sensory cellscoregonid fisheslagenasacculuslake baikalultrastructuresensory system in fish