immediately_preceded_by developmental stage Medaka stage 41 Medaka stage 42 3rd fry stage OlatDv:0000450 Zoological Science 11: 825-839 (1994) - Stage 42 3rd fry stage: This stage follows the appearance of ventral fin rays and scales in addition and extends to the formation of the jointed fin rays in the dorsal and anal fins (total length about 7 mm). - medaka_ontology