Induced final maturation and ovulation in a small anabantoid teleost, the dwarf gourami, Colisa lalia. I. The effects of gonadotrophic preparations, LHRHa, steroids and thyroid hormones |
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| Authors: | NK Ng D Tsi AD Munro |
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| Institution: | (1) Fish Neurobiology Lab, School of Biological Sciences, The National University, Lower Kent Ridge Rd, Singapore, Singapore |
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| Abstract: | Colisa lalia (Ham.) has been used as a model for the development of techniques for induced spawning that are applicable to small teleosts where ovulation requires prolonged exposure to suitable breeding conditions.Human chorionic gonadotrophin (hCG;  4 IU per fish) induced ovulation within 24 hours, whereas homologous pituitary extracts were relatively ineffective. When administered in saline ( 20  g per fish per injection), des-Gly10,D-Ala6]- LHRH N-ethylamide (LHRHa) was ineffective, but it stimulated ovulation in a proportion of fish when administered ( 1.6 g per fish) as an emulsion in Freund's incomplete adjuvant (FIA). Together, these results suggest that ovulation requires the synthesis as well as the secretion of gonadotrophin in C. lalia.Long-term treatment with thyroid hormones appeared to enhance the ovulatory response to LHRHa in FIA, possibly by effects on the ovary; whereas the various steroids tested were ineffective at the dosages used |
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| Keywords: | Colisa lalia gonadotrophin gonadotrophin-releasing factor induced ovulation thyroid hormones |
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