Desarrollo embrionario y larval de Lytechinus variegatus (Echinoidea: Toxopneustidae) en condiciones de laboratório en la Isla de Margarita-Venezuela / Embrionary and larval development of Lytechinus variegatus (Echinoidea: Toxopneustidae) in laboratory conditions at Isla de Margarita-Venezuela
Rev. biol. trop
;
53(supl.3): 313-318, dic. 2005. ilus, tab
Artículo
en Español
| LILACS
| ID: lil-454831
ABSTRACT
The sea urchin Lytechinus variegatus is a promissory species for aquaculture activities in tropical countries. In Venezuela, this species has some economical importance but their embryonic and larval development had not been studied. We collected specimens from seagrass beds in Margarita Island (Venezuela) and kept them in the laboratory, where they spawned naturally. With filtered sea water (temperature 28 degrees C, salinity 37 psu) and moderate aeration, the eggs and sperm were mixed (relation 1100) and reached a 90% fertilization rate. The fertilization envelope was observed after two minutes, the first cellular division after 45 minutes and the prism larval stage after 13 hours. The echinopluteus larval stage was reached after 17 hours and metamorphosis after 18 days of planktonic life, when the larvae start their benthic phase.
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Índice:
LILACS (Américas)
Asunto principal:
Óvulo
/
Lytechinus
Límite:
Animales
País/Región como asunto:
America del Sur
/
Venezuela
Idioma:
Español
Revista:
Rev. biol. trop
Asunto de la revista:
Biologia
/
Medicina Tropical
Año:
2005
Tipo del documento:
Artículo
País de afiliación:
Venezuela
Institución/País de afiliación:
Museo Marino de Marguerita/VE
/
Universidad de Oriente/VE
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