Desarrollo embrionario-larval del pez tropical Hemirhamphus brasiliensis (Beloniformes: Hemirhamphidae) a partir de huevos recolectados del medio natural

Abstract

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°50'55.2" N y 64°09'467" W). The eggs were spherical, 1 923.54 ±72.35 µm 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.

Fisiología reproductiva del pez <i>Betta splendens</i> en condiciones de laboratorio, Piedemonte Andino Amazónico (Colombia)

“…Para la descripción de los cambios morfométricosy embriológicos se extrajo una muestra equivalente al 33% de ovocitos fecundados 31 , los cuales fueron clarificados (solución transparentadora YBAG/85) y fijados (1000 ml H 2 O + 6,5 g NaCl + 10 ml de formol 40%) 10 para su observación. Las muestras fueron colectadas cada 5 min hasta la evidencia de la organogénesis; después se colectaron cada 4 h hasta su eclosión, además se tomaron cuatro larvas para determinar aspectos morfométricos 32 . Se realizó la clasificación y descripción de los diferentes estadios 25 , así como la morfometría y merística de los huevos y larvas 35 ; se separaron los estadios en pre-larvas, larvas y post-larvas 20,25 .…”

Embryonic and larval development of <i>Eugerres mexicanus</i> (Perciformes: Gerreidae) in Tenosique, Tabasco, Mexico.

“…Other measurements included the length and width of the mouth, eye, orbital circle, and orbital fossa, and the length of the head, pre-anal and post-anal lengths, and length to the fork. The meristic characters of the fins included width of the dorsal, anal and pectoral fins, as well as the number of spines and rays on the fins during the larval development (Rosas et al 2008).…”