immediately_preceded_by developmental stage Medaka stage 34 Medaka stage 35 OlatDv:0000380 Zoological Science 11: 825-839 (1994) - 5 days 12 hrs Stage 35 (5 days 12 hrs) Stage at which visceral blood vessels form: The tip of the caudal fin reaches beyond the posterior border of the eye. Guanophores are distributed from the head to the vicinity of the tail tip. Blood circulates through the internal tissues of the head and the viscera to Cuvier's ducts. The tubular structure of the spinal cord is revealed. The opening of the oral cavity to the mouth and the presence of several pit organs on the frontal bone can be recognized. - 5 days 12 hrs medaka_ontology stage at which visceral blood vessels form