immediately_preceded_by developmental stage Medaka stage 33 Medaka stage 34 OlatDv:0000370 Zoological Science 11: 825-839 (1994) - 5 days 1 hr Stage 34 (5 days 1 hr) Pectoral fin blood circulation stage: The tip of the caudal fin has several melanophores and reaches the eye. Blood circulation is apparent in the pectoral fins, which frequently move (flutter). The choroidea of the eye becomes so black that it is almost impervious to light. - 5 days 1 hr medaka_ontology pectoral fin blood circulation stage