Abstract
In Pseudoplatystoma punctifer (e.g. Pseudoplatystoma fasciatum) larvae, parental eiects on hatching, growth of initial stages and dry feed adaptationwere evaluated as they could in£uence fry heterogeneity, which is responsible for the enhancement of cannibalism, and which remains one of the main factors of mortality during larval stages. A full factorial experiment was carried out with 3 females ! 3 males producing nine families of full siblings, raised separately in triplicates into 30L tanks at 28 0.5 1 Ci n a water recirculating system. Paternal and maternal eiects were observed on hatching success, yolk utilization e⁄ciency and growth until 26 days post fertilization. Hatching success was generally over 80% except forone male ! female combination (25%).Total length (TL) at hatching and during the ¢rst 4 weeks of exogenous feeding on live Artemia nauplii and dry feeds was determined in each family using digital photographs of larvae and NIH IMAGE Janalysis freeware. Mean TL was calculated for each family at each sampling time and analysed using multifactorial analysis of variance tests. These results indicate not only dam but also sire eiects at very early developmental stages as well as in subsequent stages of P. punctifer.
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