Abstract
Experiments were carried out to determine whether it was possible to produce all female diploid gynogenetic coho salmon ( Oncorhynchus kisutch). Experimental groups were cold shocked at −0.5° C for 4 h in brackish water (15‰). The effect of varying egg and milt temperature before insemination and cold shock was investigated as was the effect of elapsed time from mixing of gametes to application of cold shock. Eggs were collected from females with and without hormonally induced ovulation. Irradiated sperm from another species ( O. tshawytscha) was tested for its ability to induce gynogenesis in coho eggs. Cold shocking resulted in diploid gynogenetic all female coho when eggs were inseminated with irradiated sperm. Hatching success was affected by the use of eggs derived from either normal or induced ovulation and also by the interval between egg-activation and cold shocking. The diploid gynogenetic fish had a slower growth rate and higher mortality than the controls up to 230 days post-hatching. Gynogenesis by irradiated chinook sperm failed. However, the control crosses with normal chinook sperm yielded hybrids that exhibited good hatchability and a growth rate five times higher than in coho salmon.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
