caa a22 4500 445296380 CHVBK 20180317142543.0 cr unu---uuuuu 170323e20100601xx s 000 0 eng 10.1134/S0032945210050036 doi (NATIONALLICENCE)springer-10.1134/S0032945210050036 Cytomorphology of female and male gonads in Antarctic toothfish Dissosctichus mawsoni (Nototheniidae) from the Ross Sea in the summer period [Elektronische Daten] [S. Piyanova, N. Kokorin] Results of histological analysis of gonads of female and male Antarctic toothfish Dissostichus mawsoni caught in the Ross Sea of the Pacific sector in the period of Antarctic summer (December-February) 2004-2005 are presented. Morphological indices and index of gonad maturity are described and ecological criteria of assessment of maturity stages of ovaries, cytological indices of oocytes, and the type of toothfish oogenesis are determined. It was established that in the period of fishing Antarctic toothfish, females and males with gonads at maturity stage III dominate. Ovaries contain two groups of oocytes of the period of trophoplasmatic growth and large oocytes of the nearest spawning season that comprise the smallest proportion of total sex cells. In the testes of two male toothfish, the primary fusion of renal and generative tissues was revealed. It is suggested that the termination of gonad maturity of toothfish takes place from March to April, and spawning takes place from June to August. Pleiades Publishing, Ltd., 2010 Antarctic toothfish nationallicence Ross Sea nationallicence gonads nationallicence gametogenesis nationallicence spawning nationallicence Piyanova S. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnosel'skaya, 17, 107140, Moscow, Russia aut Kokorin N. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnosel'skaya, 17, 107140, Moscow, Russia aut Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/5(2010-06-01), 374-385 0032-9452 50:5<374 2010 50 11489 https://doi.org/10.1134/S0032945210050036 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0032945210050036 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Piyanova S. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnosel'skaya, 17, 107140, Moscow, Russia aut NATIONALLICENCE 700 1- Kokorin N. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnosel'skaya, 17, 107140, Moscow, Russia aut NATIONALLICENCE 773 0- Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/5(2010-06-01), 374-385 0032-9452 50:5<374 2010 50 11489 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer