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Polar Biology

, Volume 11, Issue 8, pp 615–621 | Cite as

Features of gametogenesis and sexual cycles of six notothenioid fishes from East Antarctica

  • G. A. Shandikov
  • T. I. Faleeva
Article

Summary

Some features of gametogenesis and sexual cycles of three species of the genus Trematomus (fam. Nototheniidae)-Trematomus centronotus Regan, T. eulepidotus Regan and T. scotti (Boulenger) and three species of icefishes (fam. Channichthyidae)-Chionodraco hamatus (Lönnberg), Ch. myersi Tyler and Neopagetopsis ionah Nybelin-were studied at Davis and Mawson Seas during austral autumn (March–April), 1983. Two peculiarities of the sexual cycles of Trematomus species may be noted: the uniform state of gonads of mature specimens of each species, and differences in time of spawning (austral summer and autumn for T. centronotus and T. eulepidotus, and, evidently, beginning of spring or the end of winter for T. scotti). Among the features of gametogenesis of icefishes are the early accumulation of yolk in oocytes, and the beginning of polarization and homogenization of yolk in oocytes, which are far from definitive sizes. Some differences in spawning time were registered in first maturing and repeatedly maturing specimens of Ch. hamatus. Repeatedly maturing specimens probably begin to spawn in December–January; those maturing for the first time evidently still spawn in March–April. Ch. myersi and N. ionah, judging by singular mature specimens, supposedly spawn during austral autumn.

Keywords

Austral Summer Uniform State Sexual Cycle Mature Specimen Early Accumulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • G. A. Shandikov
    • 1
  • T. I. Faleeva
    • 2
  1. 1.Southern Ocean Fish Resources LaboratorySouthern Scientific Research Institute of Marine Fishery and Oceanography (YugNIRO)CrimeaUSSR
  2. 2.Chair of Ichthyology and HydrobiologyLeningrad State UniversityLeningradUSSR

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