Embryonic Development and a Simple Method for the Evaluation of Developmental Competence in Murray Cod (Maccullochella peelii) Eggs

Abstract

From fertilisation to hatching, we investigated the embryonic development of hatchery-reared Murray cod eggs incubated at 20°C and determined the developmental stages. Twenty-eight readily identifiable stages with distinct morphological features were described and illustrated. Meanwhile, a simple and effective method for evaluating developmental competence at 1/2 epiboly was developed, which does not require the exhausting removal of egg chorion. Acute mortality was observed within 28 h post-fertilisation, indicating that critical stages may occur during this period. The presented results may provide vital information to improve hatchery practices.