[Embrionary-larval development of the tropical fish Hemirhamphus brasiliensis (Beloniformes: Hemirhamphidae) from eggs collected in the wild].
The embryo formation and larval development of Hemirhamphus brasiliensis Linnaeus, 1758 (Pisces: Hemirhamphidae) is described from morula stage eggs collected on Sargassum sp. Thalii in the field (10 degrees 50'55.2" N y 64 degrees 09'467" W). The eggs were spherical, 1 923.54 +/- 72.35 microm diameter with several corionic filaments, and are striated. During the first 48 h the embryo developed cephalic vesicle, miomers, and a heart located on the external body surface, beating strongly and circulating colorless blood which became pigmented red later. Before hatching, the larva developed kidney, gut tract, liver and biliar vesicle, pectoral fins, four pairs of gill arches and the mouth. The larva hatched at 114 h, the body was torpedo-shaped, yellow-green, with several dendriform melanophores; the pelvic fin was observed 72 h post hatching. At 240 hours the metamorphoses was completed. When the larvae hatched they could ingest Artemia metanauplii.
Instituto de Investigaciones Científicas, Universidad de Oriente Núcleo de Nueva Esparta, Boca del Río, Estado Nueva Esparta, Venezuela. rosas@ne.udo.edu.ve
Jesús
J
Rosas
Ernesto
E
Mata
Aidé
A
Velásquez
Tomas
T
Cabrera
D000818:Animals; D023761:Beloniformes / Q000196:embryology*; D004625:Embryo, Nonmammalian / Q000196:embryology*; D007814:Larva / Q000254:growth & development; D010063:Ovum / Q000254:growth & development*; D013997:Time Factors