Larval and postlarval morphometry and growth rates of the bivalves Venus antiqua King Broderip, 1835 and Gari solida Gray, 1828 reared in the laboratory Morfometria y tasas de crecimiento larvario y postlarvario de los bivalvos Venus antiqua King Broderip, 1835 y Gari solida Gray, 1828 cultivados en laboratorio

Olavarria, E.; Farias, A.; Uriarte, I.

Revista de Biologia Marina. Diciembre; 312: 107-116


Accession: 038370298

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Laboratory cultures of larvae and postlarvae of the clam, Venus antiqua (King & Broderip, 1835), and the sweet clam, Gari solida (Gray, 1828), were carried out to obtain large amounts of spats. Adult clams were conditioned in the laboratory, D-shape larvae were successfully reared to the pediveliger stage. D-shape larvae of V. antiqua showed a length of 113.5 mu-m (+- 1.0), that was significantly higher than G. solida with 98.0 mu-m (+- 4.1). The size when metamorphosis occurred was significantly different between species, with a mean length of 312.3 mu-m (+- 1.8) in V. antiqua and 266.0 (+- 2.4) mu-m in G. solida. Competent pediveliger larvae metamorphosed and only postlarvae of V. antiqua were successfully cultured up to 2 mm in length and then transferred to the sea. The rearing of G. solida postlarvae was possible up a size of 1 mm length, with only few survivors up to 2 mm. The rate of postlarval shell growth was high with maximum values of 25.6 mu-m cntdot day-1 for V. antiqua and low for C. solida with maximum values of 17.2 mu-m cntdot day-1. Thus, there is a successful culture technology of V. antiqua from larvae to spat of 2 mm, but more studies are required on the postlarval development of G. solida.