Induced gonadal maturation and rematuration in milkfish: Limited success with chronic administration of testosterone and gonadotropin-releasing hormone analogues (GnRH-A)
MetadataPerlihat publikasi penuh
Cited times in Scopus
Nine experiments were conducted to investigate the influence of chronic administration of testosterone (T) and gonadotropin-releasing hormone (GnRH) analogues on first maturation of 4- to 6-year-old fish and rematuration of 6- to over 9-year-old spent/regressed fish. Implantation of T or T in combination with luteinizing hormone-releasing hormone analogue (LHRH-A) had no marked effect on maturation rate of 4-year-old milkfish. The percentage of maturing fish was low and similar to controls in Experiment 1 (T, 31–35%; control, 35%) and Experiment 3 (T, 13%; T plus LHRH-A, 28%; control, 22.2%). Most of the 4-year-old maturing fish were males; maturing females were obtained only from the T-implanted groups in Experiment 1. In Experiment 3, T-implanted maturing females were able to retain yolky eggs whereas maturing control females did not, indicating that testosterone may have enhanced vitellogenesis and maintained the integrity of vitellogenic oocytes. Tank-reared maturing 4-year-old females, about half the size of older first maturing females, were induced to spawn. This is the first case of maturation and spawning of 4-year-old milkfish reared in tanks. As in Experiments 1 and 3, the percentage maturation of spent fish in Experiments 7 and 8 was similar for T-implanted and controls. On the other hand, the 4-year-old immature fish in Experiments 2 and 4, the 5- and 6-year-old immature fish in Experiments 5 and 6, and the spent 6-year-old fish in Experiment 9 were immature or regressed throughout. The factors which may have influenced the results of these experiments include age and reproductive history of the fish, timing of hormone implantation, experimental and holding conditions, and stress.
Suggested CitationMarte, C. L., Crim, L. W., & Sherwood, N. M. (1988). Induced gonadal maturation and rematuration in milkfish: Limited success with chronic administration of testosterone and gonadotropin-releasing hormone analogues (GnRH-A).
- AQD Journal Articles 
Showing items related by title, author, creator and subject.
Milkfish culture in brackishwater ponds Lijauco, Melchor M.; Juario, Jesus V.; Baliao, Dan D.; Grino, Eliseo; Quinitio, Gerald F. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1979)The manual is intended as a guide for operation in milkfish farming. It is presented under the following major sections: 1) Handling of fry - counting, storage and transport; 2) Pond layout and construction - selection of ...
Management of milkfish broodstock Emata, Arnil C.; Marte, Clarissa L.; Garcia, LM (Aquaculture Department, Southeast Asian Fisheries Development Center, 1992)The manual on milkfish (Chanos chanos) broodstock management covers the following topics: reproductive biology; sources of broodstock; holding facilities for broodstock; feeding; determination of gonadal development; ...
Fingerling production of hatchery-reared milkfish (Chanos chanos) in earthen nursery ponds Coniza, Eliseo B.; Marte, Clarissa L.; Coloso, Relicardo M.; Huervana, Fredson L. (Aquaculture Department, Southeast Asian Fisheries Development Center, 2010)Fingerling production of milkfish in ponds maybe operated as a commercial enterprise or a component of milkfish farming that comprises nursery, transition and rearing or grow-out phases. The fishpond nursery is used to ...