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Effects of unilateral ovariectomy on recruitment and growth of follicles in the rainbow trout, Oncorhynchus mykiss

Tyler, C.R.; Nagler, J.J.; Pottinger, T.G.; Turner, M.A.. 1994 Effects of unilateral ovariectomy on recruitment and growth of follicles in the rainbow trout, Oncorhynchus mykiss. Fish Physiology and Biochemistry, 13 (4). 309-316. 10.1007/BF00003435

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Abstract/Summary

Virgin female rainbow trout, Oncorhynchus mykiss, were unilaterally ovariectomised at various stages of ovarian development to investigate the effect of the removal of one ovary on subsequent recruitment and growth of follicles in the remaining ovary. The right ovary was removed from groups of 12–15 fish, 12, 7 and 4 months before they were due to ovulate, and the gonadosomatic index and follicle number and size determined just prior to ovulation. There were no differences in fecundity or follicle size in fish unilaterally ovariectomised at 12 and 7 months prior to ovulation compared to the controls. However, in the females unilaterally ovariectomised 4 months prior to ovulation, the remaining ovary either had the normal number of follicles for a single ovary but of a significantly larger size than follicles in the controls, or alternatively had almost 70% more than the normal number of vitellogenic follicles but comprising two distinctly different size populations. Differences in plasma oestradiol-17β concentrations at the final sample were seen only in females unilaterally ovariectomised 4 months prior to ovulation, where the levels were significantly lower than both the sham operated and control fish (p < 0.05). These data show that in the rainbow trout, complete compensatory ovarian hypertrophy following unilateral ovariectomy can occur throughout a major part of ovarian development, but that follicle recruitment is limited to stages up to (and therefore fecundity is determined by) mid-vitellogenesis.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/BF00003435
CEH Sections: _ Pre-2000 sections
ISSN: 0920-1742
Additional Keywords: unilateral ovariectomy, hypertrophy, recruitment, fecundity, follicle, rainbow trout
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 06 Aug 2015 08:55 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511137

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