EMBRYONIC AND EARLY LARVAL DEVELOPMENT OF HYBRID BETWEEN LAMPAM ♀ (Puntius gonionotus) X KERAI ♂ (Hypsibarbus wetmorei)

Embryonic and larval development of hybrid between Lampam ♀ (Puntius gonionotus) X Kerai ♂ (Hypsibarbus wetmorei) were investigated under captive rearing condition. The matured eggs and sperms were collected by stripping of the each brood stock. The embryonic developing stages were observed at every 10 min intervals at the first hour, 20 min intervals at the second hour, 30 min for the next hour and then hourly intervals up to hatching. When hatching was completed, the observations were continued within 2 h interval for the first day and at least every 6 h interval for the following days. Eggs of Lampam were fertilized with sperm of Kerai. The hatching of hybrid breeding P. gonionotus ♀ X H. wetmorei ♂ was occurred at 14 h after fertilization at temperature ranged from 23.0 to 25.0 ºC. The larvae of P. gonionotus ♀ X H. wetmorei ♂ swam actively when the yolk sac became absent at 46 h after hatching, that were considered completed for the early larval stage. This study represents the first time description of the early development stages for hybrid of P. gonionotus ♀ X H. wetmorei ♂ in captive culture breeding. The valuable knowledge and information emerged from the designated studies will ultimately be helpful to know the basic breeding biology towards the establishment of seed production and rearing techniques of hybrid P. gonionotus ♀ X H. wetmorei ♂ for aquaculture production.