Abstract

The Guacuco Chione cancellata, is one of the species of bivalve mollusks of greater commercial importance in the coasts of the Amuay Bay. The majority of the settlers or locals of the zone lives on their extraction and commercialization. Until know there is no information of the larval development of this species, to be exploded and cultivated in the future. By such reason, it’s realised the induction to the egg-laying of this mollusk, using the technique of thermal shock and the description of its larval development. We obtained the egg-laying after three hours of heat treatment and the embryos were placed and maintained in containers of 18 liters with 15 liters of filtered sea water and sterilized to 35 UPS and a temperature of 27 ºC, with a change of the 100% of the water, every 24 hours. The larvae fed with the microalgae Chaetoceros calcitrans, Nannocloropsis sp. and Tetraselmis sp. up to a concentration of 20,000 cel/ml each one. The embryonic development of the Chione cancellata it was generated with all normality reaching all the larval phases on the following way: the cellular divisions (first, second, third and fourth stage) It appear in the first hours; the phase of mórula irregular three hours later; the phase of estenoblástula appeared starting the third hour and the first ciliary larva appeared stating the fifth hour; the advances ciliary larva appeared passed the six hours; the trocófora phase between the seven and eight hours; the phase of trocófora larva, without apical flagellum between the eight and ten hours and the first larva “D” It appear starting the 16 hours. The larva pediveliger it was present at the 12 days of cultivating.

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