Oocyte and embryo quality in Crassostrea gigas (Portuguese strain) during a spawning period in Algarve, South PortugalClara Massapina, Sandra Joaquim, Domitilia Matias and Nicole DevauchelleAquat. Living Resour., 12 5 (1999) 327-333DOI: https://doi.org/10.1016/S0990-7440(99)00115-1