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 97-102 POISSON D'EAU DOUCE CYCLE DE REPRODUCTION MATURITE SEXUELLE CROISSANCE PISCICULTURE METHODE D'ELEVAGE ETUDE EXPERIMENTALE REPRODUCTION ARTIFICIELLE TRAITEMENT HORMONAL OVAPRIM INDONESIE JAWA 1998 1998/05/11-15 Jakarta (IDN) ; Can Tho IRD ; Can Tho University fdi:010020349 ENG https://www.documentation.ird.fr/hor/fdi:010020349 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/doc34-08/010020349.pdf Horizon (IRD) Observations on growth rate and occurrence of first sexual maturity were done on a population of 75 #Pangasius djambal$ originally caught in the wild, individually tagged, and reared in 200 m2 ponds at a stocking density of 0.4-0.5 fish/m2 at the Sukamandi research centre (Java). These fish, weighing initially between 190 and 1100 g were fed with a 35-40% crude protein pelleted feed and followed up during a period of 16 months. Two trials of induced ovulation were also carried out on females from a small stock of a dozen adult fish reared in floating cages at the Danau Teluk fish culture station (Sumatra). Between June 1997 and October 1998, the mean body weight of fish increased from 555 g to 4162 g, which corresponded to a daily weight gain of 7.4/d. The highest individual growth rate observed between two successive sampling dates was of 16.5 g/d. The mean growth rate of #P. djambal$ females (8.9 plus or minus 2.2 g/d) was significantly higher than that of males (6.3 plus or minus 1.9 g/d) and first sexual maturity occurred several months earlier in males than in females. Oocyte maturation and ovulation were induced with two successive injections of Ovaprim at 8 h interval, corresponding to a total dose of 0.9 mL/kg. Among four females treated, three ovulated and could be stripped. Mean hatching rates obtained after artificial fertilisation of eggs varied between 8 and 31%. After 27 days of age, the survival rate of larvae fed live #Artemia$ nauplii then dried feed was 61%. No cannibalism was observed during the larval rearing which did not appear as a critical phase of the breeding cycle. Although preliminary, these results confirm the great potential interest of using #P. djambal$ for aquaculture. The induced breeding and larval rearing carried out for the first time in this species represent a breakthrough in the control of its biological cycle in captivity. (Résumé d'auteur) 040AQUAC