Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Hydrobiological Journal
SJR: 0.227 SNIP: 0.575 CiteScore™: 0.24

ISSN Druckformat: 0018-8166
ISSN Online: 1943-5991

Volumes:
Volumen 55, 2019 Volumen 54, 2018 Volumen 53, 2017 Volumen 52, 2016 Volumen 51, 2015 Volumen 50, 2014 Volumen 49, 2013 Volumen 48, 2012 Volumen 47, 2011 Volumen 46, 2010 Volumen 45, 2009 Volumen 44, 2008 Volumen 43, 2007 Volumen 42, 2006 Volumen 41, 2005 Volumen 40, 2004 Volumen 39, 2003 Volumen 38, 2002 Volumen 37, 2001 Volumen 36, 2000 Volumen 35, 1999 Volumen 34, 1998

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v53.i3.60
pages 60-69

Comparative Morphology of Early Oogenesis Stages in Two Forms of Baikal Grayling Thymallus baicalensis (Thymallidae)

A. N. Zaytseva
Limnological Institute SB Russian Academy of Sciences Irkutsk, Russian Federation
N. S. Smirnova-Zalumi
Limnological Institute SB Russian Academy of Sciences Irkutsk, Russian Federation
N. I. Zakharova
Irkutsk State University Irkutsk, Russian Federation
L. V. Sukhanova
Limnological Institute SB Russian Academy of Sciences Irkutsk, Russian Federation

ABSTRAKT

The comparative histological study was performed on gonads at the early stages of ontogenesis of two forms of grayling Thymallus baicalensis grown in aquaculture. It was established that cytological features of ovaries are formed earlier than anatomical. Over gonads' forming germ cells in black and white grayling undergo identical phases of development at the same age. Diameter of oocytes (and their nuclei) was similar at the beginning of previtellogenesis. Both forms of grayling of the same age differ by the ratio of the number of germ cells of different development phases. The number of maturing oocytes at the pachytene stage and at the beginning of previtellogenesis does not increase in the black grayling at the age of 733 and 1102 degree-days, whereas in the white grayling at the age of 1102 degree-days the ratio of germ cells varies at all stages of development. Moreover, the number of maturing oocytes at the pachytene stage and at the beginning of previtellogenesis is 2 and 3 times higher than in the black grayling. Dynamics of germ cell ratios may indicate the completion of the reserve of maturing oocytes forming in the black grayling and the continuation of this process in the white one. Further investigations are required for studying differences in the rates of reproduction of gonium and primordial germ cells and nature of the replenishment of oocyte reserves.


Articles with similar content:

A new species of the genus Chlorococcum Menegh. emend. Starr (Chlorophyta, Chlorococcaceae)
International Journal on Algae, Vol.1, 1999, issue 4
E. N. Demchenko
Estimating Population Parameters of the Cladocera
Hydrobiological Journal, Vol.34, 1998, issue 4-5
V. I. Razlutskii
Taxonomic Composition and Ecology of Green Algae (Chlorophyta and Streptophyta) in Shallow Weakly Mineralized Forest Lakes
International Journal on Algae, Vol.14, 2012, issue 4
L. G. Korneva
Structure of Dominance/Diversity of Benthic Macroinveretebrate Communities in the Carpathian Rivers
Hydrobiological Journal, Vol.55, 2019, issue 4
S. A. Afanasyev, Ye. N. Lietytska
Individual Variation and Seasonal Dynamics of Carotenoid Content in Gonads of Black Sea Mussels Mytilus galloprovincialis Cultivated in Collectors
Hydrobiological Journal, Vol.34, 1998, issue 4-5
M. V. Nekhoroshev, T. N. Yaitskaya, Z. A. Romanova, A. F. Kozintsev, G. S. Minyuk