Horizon 1 1 10 C-ACTI : Communications avec actes dans un congrès international The biological diversity and aquaculture of clariid and Pangasiid catfishes in South-East Asia : proceedings of the mid-term workshop of the "Catfish Asia project" Characterisation, Utilisation and Maintenance of Biological Diversity for the Diversification and Sustainability of Catfish Culture in South East Asia 91-96 POISSON D'EAU DOUCE CYCLE DE REPRODUCTION HORMONE INDUCTION TEMPERATURE VARIATION SAISONNIERE PISCICULTURE METHODE D'ELEVAGE ETUDE EXPERIMENTALE INDONESIE JAWA SUKAMANDI STATION 1998 1998/05/11-15 Jakarta (IDN) ; Can Tho IRD ; Can Tho University fdi:010020348 ENG https://www.documentation.ird.fr/hor/fdi:010020348 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/doc34-08/010020348.pdf Horizon (IRD) An evaluation of the seasonal variations of sexual activity of #P. hypophthalmus$ broodstock held in 50 m2 ponds was carried out between April 1997 and April 1998 at the Sukamandi station (West Java, 6°S of latitude). These variations were assessed through the evolution of oocyte diameter of individual females, the proportion of fluent males and the success of hormonal-induced breeding trials. High proportions of fluent males and mature females with post-vitellogenic oocytes of modal diameter superior to 1.00 mm were found at anytime. As a consequence, successful induced breeding of this species using hormonal treatments could be performed regardless of season and allowed an all year long production of fry. This continuous sexual maturity of #P. hypophthalmus$ broodstock, during both the dry and rainy seasons, may have resulted to a large extent from rather stable conditions, with a monthly mean water temperature constantly high (28-31°C) and a low variation of day length during the year. Ovulation was successfully induced at 3, 2 and 4 months interval in a same #P. hypophthalmus$ female. This indicated a quick recovery of oogenesis in females reared in the ponds. (Résumé d'auteur) 040AQUAC