immediately_preceded_by developmental stage Medaka stage 31 Medaka stage 32 Formation of pronephros and air bladder OlatDv:0000350 Zoological Science 11: 825-839 (1994) - 4 days 5 hrs Stage 32 (4 days 5 hrs) Somite completion stage (Formation of pronephros and air bladder): The swim (air)bladder is recognized as a transparent vacuolar body beneath the 3rd somite, and the distinct kidneys (pronephroi) lie in contact with the bilateral sides of the notochord in the 1st somite. In the otic vesicles, a tubular (semicircular canals) membranous labyrinth can be seen. In the posterior end of the tail, the somites are indistinct. The number of whole somites counted is 30. Two hours later, the blood stream is twisted in the posterior end of the tail. - 4 days 5 hrs medaka_ontology somite completion stage