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On the basis of growth nurse egg consumption and respiration rate measurements, an energy balance for encapsulated embryos of Crepldula dllatata Lamarck was established in an estuanne population in Southern Chlle Consumpt~ on of nurse egg was highest within the first weeks of life of the shelled embryos Embryonic growth rate was hlgh in telms of shell length and biomass, compared with literature data for pelagic Ialvae of related species The hatch~ ng process began when the embryos leached shell lengths between 1100 and 1200~ tm (extreme values 1075 and 1600pm) Oxygen consumption values pei individual were very low and consequently, had little influence on the energy balance During early development, ingested energy met the energy costs of the embryos The balance point between ingested and consumed energy occurred at a shell length of 650 pm Above this size, energy costs greatly …