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
Article
in Spanish
| LILACS
| ID: lil-454831
Responsible library:
BR1.1
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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Collection:
International databases
Database:
LILACS
Main subject:
Ovum
/
Lytechinus
Limits:
Animals
Country/Region as subject:
South America
/
Venezuela
Language:
Spanish
Journal:
Rev. biol. trop
Journal subject:
Biology
/
Tropical Medicine
Year:
2005
Document type:
Article
Affiliation country:
Venezuela
Institution/Affiliation country:
Museo Marino de Marguerita/VE
/
Universidad de Oriente/VE