Problems associated with hormonal induction of gonad development in milkfish (Chanos chanos)
Recent developments in milkfish breeeding include succesful induced spawning of wild1,2 and captive3-5 fish and spontaneous spawning of broodstock.6 Gravid spawners, however, are available only during the wild or are reared in captivity. The seasonal and uncertain supply of wild fry is a major constraint in efforts to increase production of this important food fish in the Philippines, Indonesia, and Taiwan. Gonad devepolment can be induced in some fish by hormone administration. This has been recently reviewed by Lamp7 and other workers.8,9 Induced gonad development using purified salmon gonadotropin have been reported in Salmo gairdneri,10 Oncorhynchus gorbuscha,11,12 and Mugil cephalus.13,14 Hormones are usually administered by injection at frequent intervals in these studies. To reduce stress from frequent handling, a slowrelease hormone cholesterol pellet was with success in Salmo auratus and Ophicephalus striatus.16 Recent literature suggests that vitellogenesis in fish (at least yolk granule or gobule formation) is under control of estrogen and a pituitary factors. Estrogen stimulates the liver to produce vitellogenin, while the incoporation of vitellogenin into oocytes requires a pituitary factor which may not be the glycoprotein (Con A II) gonadotropin.7 In the light of this information and in anticipation of a synergistic role of thyroid hormone ,17 a combination of fish pituitary extract, estrogen and thyroxin was used in some of our experiments. Our attempts to induce gonad development in sexually immature milkfish and rematuration of regressed fish have not been sucessful to date. This paper presents the experiments done and discusses factors possibly contributing to the negative resp[onse in this fish.
Lacanilao, F., Marte, C. L., & Lam, T. J. (1985). Problems associated with hormonal induction of gonad development in milkfish (Chanos chanos). In B. Lofts & W. N. Holmes (Eds.), Current Trends in Comparative Endocrinology. Proceedings of the 9th International Symposium in Comparative Endocrinology, 7-11 December 1981, Hongkong (pp. 1247-1253). Hong Kong: Hong Kong University Press.
Small-scale freshwater aquaculture development: Experiences from the Philippines on giant freshwater prawn, milkfish and tilapia Aya, Frolan (Japan International Cooperation Agency, 2013-12)The Aquaculture Department of the Southeast Asian Fisheries Development Center (SEAFDEC/AQD) has been promoting a number of programs towards effective dissemination and adoption of science-based aquaculture technologies ...
Pudadera Jr., Beato J.; Corre, Kaylin G.; Coniza, Eliseo; Taleon, Gisella Ann (Asian Fisheries Society, 1986)An experiment on the integrated farming of broiler chickens with milkfish (Chanos chanos), tilapia (Oreochromis niloticus) and shrimp (Penaeus indicus) in brackishwater ponds was conducted in 1,000-m2 ponds of ...
Marte, Clarissa L.; Toledo, Jeobert; Quinitio, Gerald; Castillo, Antonio (Asian Fisheries Society, 1986)Natural spawnings of milkfish from floating cages were obtained from different stocks of 5-7 year-old milkfish in 1980, 1981, 1983 and 1985. The maximum number of eggs collected in 1980, using a series of 1-m diameter ...