SciELO - Scientific Electronic Library Online

vol.28 issue4The Acromion and its Different FormsMuscle Mass Estimation of Appendicular Limb, for Dual Energy X Ray Absorciometry (DEXA) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


International Journal of Morphology

On-line version ISSN 0717-9502


DIAZ OLARTE, John; MARCIALES-CARO, Lili J; CRISTANCHO VASQUEZ, Freddy  and  CRUZ-CASALLAS, Pablo E. Comparison of the Embryonic Development of Piaractus brachypomus (Serrasalmidae) and Pseudoplatystoma sp. (Pimelodidae). Int. J. Morphol. [online]. 2010, vol.28, n.4, pp.1193-1204. ISSN 0717-9502.

Pseudoplatystoma sp. and Piaractus brachypomus are two species of freshwater fishes endemic to South America as a high commercial crop species. The aim of this study was to compare the embryonic development of these two species until they hatch. To observe embryonic development fertilized oocytes were incubated obtained by hormonal induction in upwelling incubators Woynarovich type under controlled conditions of water quality. The cleavages were observed for Pseudoplatystoma sp. from 0:30 hours post fertilization (HPF) until 2:00 pm (HPF), whereas in P. brachypomus these occurred between 0:30 - 1:30 HPF. The stage of blastula, gastrula until the closure of blastopore Pseudoplatystoma sp. was observed in sp between 2:00 to 12:00 P. HPF while in P. brachypomus between 2:00 to 8:00. The hatching in Pseudoplatystoma sp was observed between 14:00 to 18:00 HPF, whereas P. brachypomus was faster, was observed from 12:00 until 14:00 HPF HPF, and was more homogeneous than Pseudoplatystoma sp.

Keywords : Embryonic development; P. Brachypomus; Pseudoplatystoma sp.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License