The Tail of a Fish Larva as Respiratory Organ

RESPIRATION through provisional organs is found in many tropical fishes. Rauther¹ has summarized this subject and Kryzanovski² has lately described the respiration in the teleostome fish embryos and larvæ. In cases where the circulation develops before the proper respiratory organs, Krogh³ says that part of the animal surface functions provisionally as a respiratory organ. Capillary or lacunar systems of blood vessels are indicated by Kryzanovski as a respiratory system of certain Cichlidæ fishes, which have the anal or the dorsal fin slightly vascularized.