Abstract
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.
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References cited
Billard R. 1987. The reproductive cycle of the male and female brown trout (Salmo trutta fario); a quantitative study. Reprod. Nutr. Develop. 27: 29–44.
Billard, R., Crim, L.W., Peter, R.E. and Breton, B. 1982. Long-term changes in plasma and pituitary GtH after castration of rainbow trout at an immature stage. In Reproductive Physiology of Fish. pp. 50. Edited by C.J.J. Ritcher and H.J.Th. Goos. Pudoc Press, Wageningen.
Billeter, E. and Jorgensen, C.B. 1976. Ovarian development in young toads, Bufo bufo bufo (L.): Effect of unilateral ovariectomy, hypophysectomy, treatment with gonadotropin (hCG), growth hormone and prolactin, and importance of body growth. Gen. Comp. Endocrinol. 29: 531–544.
Carragher, J.C., Sumpter, J.P., Pottinger, T.G. and Pickering, A.D. 1989. The deleterious effects of cortisol implantation on reproductive function in two species of trout, Salmo trutta L. and Salmo gairdneri Richardson. Gen. Comp. Endocrinol. 76: 310–321.
Craig-Bennett, A. 1931. The reproductive cycle of the three spined stickleback, Gasterosteus aculeatus Linn. Phil. Trans. Roy. Soc. London Ser. 219: 197–279.
Dadzie, S. and Hyder, M. 1976. Compensatory hypertrophy of the remaining ovary and the effects of methallibure in the unilaterally ovariectomized Tilapia aurea. Gen. Comp. Endocrinol. 29: 433–440.
Deshmukh, M.K., Krishna, R.N.S. and Subhedar, N. 1992. Ovarian stretch signals trigger volume increase in the magnocellular preoptic nuclear region in the brain of the catfish, Clarias batrachus (Linn.). J. Exp. Zool. 263: 231–234.
Franchi, L.L., Mandle, A.M. and Zuckermann, S. 1962. The development of the ovary and the process of oogenesis. In The Ovary. pp. 1–88. Edited by R.E. Jones. Academic Press, New York.
Gosden, R.G., Telfer, E., Faddy, M.J. and Brook, D.J. 1989. Ovarian cyclicity and follicular recruitment in unilaterally ovariectomized mice. J. Reprod. Fertil. 87: 257–264.
Goswami, S.V. and Sundararaj, B.I. 1968a. Compensatory hypertrophy of the remaining ovary after unilateral ovariectomy at various phases of the reproductive cycle of catfish, Heteropnueustes fossilis (Bloch). Gen. Comp. Endocrinol. 11: 401–413.
Goswami, S.V. and Sundararaj, B.I. 1968b. Effect of estradiol benzoate, human chorionic gonadotrophin, and folliclestimulating hormone on unilateral ovariectomy-induced compensatory hypertrophy in catfish, Heteropnueustes fossilis (Bloch). Gen. Comp. Endocrinol. 11: 393–400.
Greenwald, G.S. 1961. Quantitative study of follicular development in the ovary of the intact or unilaterally ovariectomised hamster. J. Reprod. Fertil. 2: 351–361.
Hirshfield, A.N. 1982. Follicular recruitment in long term hemicastrate rats. Biol. Reprod. 27: 48–53.
Jansen, R. 1994. Follicles in competition. Nature, Lond. 367: 10.
Jones, R.E. 1978. Control of follicular selection. In The Vertebrate Ovary: Comparative Biology and Evolution. pp. 763–788. Edited by R.E. Jones. Plenum Press, New York.
Jones, R.E., Fitzgerald, K.T. and Duvall, D. 1978. Quantitative analysis of the ovarian cycle of the lizard Lepidodactylus lugubris. Gen. Comp. Endocrinol. 35: 70–76.
Jones, R.E., Fitzgerald, K.T. and Tokarz, R.R. 1977. Endocrine control of clutch size in reptiles. VII. Compensatory ovarian hypertrophy following unilateral ovarectomy in Sceloporus occidentalis. Gen. Comp. Endocrinol. 31: 157–160.
Jorgensen, C.B. 1973. Pattern of recruitment of oocytes to second growth phase in normal toads, and in hypophysectomised toads Bufo bufo bufo (L), treated with gonadotrophin (hCG). Gen. Comp. Endocrinol. 21: 152–159.
Kanamori, A.K., Adachi, S. and Nagahama, Y. 1988. Developmental changes in steroidogenic responses of ovarian follicles of amago salmon (Oncorhynchus rhodurus) to chum salmon gonadotropin during oogenesis. Gen. Comp. Endocrinol. 72: 13–24.
Kjaer, K. and Jorgensen, C.B. 1971. Effects of mammalian gonadotropins on ovary in the toad Bufo bufo bufo (L). Gen. Comp. Endocrinol. 17: 424–431.
Lacker, H.M., Beers, W.H., Meuli, L.E. and Akin, E. 1987. A theory of follicle selection: I Hypotheses and examples. Biol. Reprod. 37: 570–580.
Meijs-Roelofs, H.M.A., Kramer, P., Osman, P. and Sander, H.J. 1984. Compensatory ovulatory mechanisms operative after first ovulation in rats unilaterally ovariectomised prepuberally. Biol. Reprod. 31: 44–51.
Meijs-Roelofs, H.M.A., Osman, P. and Kramer, P. 1982. Ovarian follicular development leading to first ovulation and accompanying gonadotrophin levels as studied in the unilaterally ovariectomized rat. J. Endocrinol. 92: 341–349.
Nagahama, Y. 1983. The functional morphology of teleost gonads. In Reproduction-Endocrine Tissues and Hormones. pp. 223–276. Edited by W.S. Hoar, D.J. Randall and E.M. Donaldson. Academic Press, New York.
Osman, P., Meijs-Roelofs, H.M.A. and Kramer, P. 1982. Compensatory follicle growth and ovulation after unilateral ovariectomy during the late prepubertal period in the rat. In Development and Function of Reproductive Organs. pp. 299–306. Edited by A.G. Byskov and H. Peters. Exerpta Medica, Amsterdam.
Peppler, R.D. and Greenwald, G.S. 1970. Influence of unilateral ovariectomy on follicular development in cycling rats. Am. J. Anatomy 127: 9–14.
Robertson, M.D. 1958. Accelerated development of testis after unilateral gonadectomy, with observations of the normal testes of rainbow trout. Bull. Fish Wildl. Serv. 58: 9–30.
Sinervo, B. and Licht, P. 1991. Hormonal and physiological control of clutch size, egg size, and egg shape in side-blotched lizards (Uta stansburiana): Constraints on the evolution of lizard life histories. J. Exp. Zool. 257: 252–264.
Sumpter, J.P., Lincoln, R.F., Bye, V.J., Carragher, J.F. and LeBail, P.Y. 1991. Plasma growth hormone levels during sexual maturation in diploid and triploid rainbow trout (Oncorhynchus mykiss). Gen. Comp. Endocrinol. 83: 103–110.
Tyler, C.R. 1991. Vitellogenesis in Salmonids. In Reproductive Physiology of Fish. pp. 295–299. Edited by A.P. Scott, J.P. Sumpter, D. Kime and M.S. Rolfe. University of East Anglia Press, Norwich.
Tyler, C.R., Sumpter, J.P. and Bromage, N.R. 1988. In vivo ovarian uptake and processing of vitellogenin in the rainbow trout, Salmo gairdneri. J. Exp. Zool. 246: 171–179.
Tyler, C.R., Sumpter, J.P. and Handford, R. 1990a. The dynamics of vitellogenin sequestration into vitellogenic ovarian follicles of the rainbow trout, Salmo gairdneri. Fish Physiol. Biochem. 8: 211–219.
Tyler, C.R., Sumpter, J.P. and Witthames, P.R. 1990b. The dynamics of oocyte growth during vitellogenesis in the rainbow trout, Salmo gairdneri. Biol. Reprod. 43: 202–209.
Wallace, R.A. and Selman, K. 1981. Cellular and dynamic aspects of oocyte growth in teleosts. Am. Zool. 21: 325–343.
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Tyler, C.R., Nagler, J.J., Pottinger, T.G. et al. Effects of unilateral ovariectomy on recruitment and growth of follicles in the rainbow trout, Oncorhynchus mykiss . Fish Physiol Biochem 13, 309–316 (1994). https://doi.org/10.1007/BF00003435
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DOI: https://doi.org/10.1007/BF00003435