<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Meiotic gynogenetic development of the rainbow trout (Oncorhynchus mykiss, Walbaum 1792) was induced in the course of egg activation performed by the UV-irradiated homologous and heterologous (European grayling Thymallus thymallus Linnaeus, 1758) spermatozoa. To recover diploidy in the gynogenetic zygotes, activated eggs were subjected to the high pressure shock in order to inhibit extrusion of the second polar body. Gynogenetic rainbow trout progeny hatched from the eggs activated by the irradiated rainbow trout and grayling milt with similar hatching rates of 28.19% and 29.22%, respectively. However, gynogenetic rainbow trout produced with grayling semen had shown lower survival than gynogenotes provided with the homologous spermatozoa during two years of rearing. Viable hybrids are not produced between rainbow trout and grayling which ensured that fish obtained in this experiment were true gynogenetic progenies. A Robertsonian polymorphism characteristic for the rainbow trout from the studied strain was also observed among the gynogenetic specimens that exhibited diploid chromosome number ranging from 58 to 62 and stable chromosome arm number (FN= 104). No radiation-induced fragments of the paternal chromosomes were observed in the gynogenetic individuals. Fish produced in both experimental variants were genotypic (XX) and phenotypic (gonads) females. The results confirmed that the gynogenetic protocol used in the present research is an efficient means of producing all-female gynogenetic rainbow trout stocks.</p></abstract>

Meiotic gynogenetic development of the rainbow trout (Oncorhynchus mykiss, Walbaum 1792) was induced in the course of egg activation performed by the UV-irradiated homologous and heterologous (European grayling Thymallus thymallus Linnaeus, 1758) spermatozoa. To recover diploidy in the gynogenetic zygotes, activated eggs were subjected to the high pressure shock in order to inhibit extrusion of the second polar body. Gynogenetic rainbow trout progeny hatched from the eggs activated by the irradiated rainbow trout and grayling milt with similar hatching rates of 28.19% and 29.22%, respectively. However, gynogenetic rainbow trout produced with grayling semen had shown lower survival than gynogenotes provided with the homologous spermatozoa during two years of rearing. Viable hybrids are not produced between rainbow trout and grayling which ensured that fish obtained in this experiment were true gynogenetic progenies. A Robertsonian polymorphism characteristic for the rainbow trout from the studied strain was also observed among the gynogenetic specimens that exhibited diploid chromosome number ranging from 58 to 62 and stable chromosome arm number (FN= 104). No radiation-induced fragments of the paternal chromosomes were observed in the gynogenetic individuals. Fish produced in both experimental variants were genotypic (XX) and phenotypic (gonads) females. The results confirmed that the gynogenetic protocol used in the present research is an efficient means of producing all-female gynogenetic rainbow trout stocks.

Application of The UV-Irradiated Homologous and Heterologous Sperm for Activa Tion of the Rainbow Trout (Oncorhynchus Mykiss) Eggs and Production of the Gynogenetic Stocks

Department of Salmonid Research, Inland Fisheries Institute in Olsztyn, Rutki, 83-330 Żukowo, Poland

Department of Ichthyology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-719 Olsztyn, Poland

Department of Marine Biology and Ecology, Institute of Oceanography, University of Gdansk, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Meiotic gynogenetic development of the rainbow trout (Oncorhynchus mykiss, Walbaum 1792) was induced in the course of egg activation performed by the...

Application of The UV-Irradiated Homologous and Heterologous Sperm for Activa Tion of the Rainbow Trout (Oncorhynchus Mykiss) Eggs and Production of the Gynogenetic Stocks

Article Category: The Biology, Physiology, Reproduction, and Health

Published Online: Oct 29, 2015

Page range: 919 - 928

Received: Jan 08, 2015

Accepted: Apr 24, 2015

DOI: https://doi.org/10.1515/aoas-2015-0032

Keywords
all female, gynogenesis, sex chromosomes, Salmonids, UV light

© by Konrad Ocalewicz

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Application of The UV-Irradiated Homologous and Heterologous Sperm for Activa Tion of the Rainbow Trout (Oncorhynchus Mykiss) Eggs and Production of the Gynogenetic Stocks

Article Category: The Biology, Physiology, Reproduction, and Health

Published Online: Oct 29, 2015

Page range: 919 - 928

Received: Jan 08, 2015

Accepted: Apr 24, 2015

DOI: https://doi.org/10.1515/aoas-2015-0032

Keywordsall female, gynogenesis, sex chromosomes, Salmonids, UV light

© by Konrad Ocalewicz

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
all female, gynogenesis, sex chromosomes, Salmonids, UV light