Goldfish ova begin rapid maturation in November. Maturation is completed in June and July. Seasonal cycles in mature and resorbing follicles were correlated with changes in basophil counts of the pituitary gland. Cytological evidence confirms the expected pituitary control of cyclic ovarian activity. Resorbing follicles are found all year but are more abundant during sexual maturity, and are particularly numerous in fish which failed to spawn. Goldfish injected with extracts of salmon pituitary for twelve days showed no cytological changes in the ovary. It is concluded that the granulosa is responsible for removal of resorbing ova and that these resorbing ova are the means of removing surplus eggs. / Science, Faculty of / Zoology, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/40434 |
| Date | January 1956 |
| Creators | Beach, Alan Winston |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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