Arti Rani* B.P.Yadav Bipra & Arun Kumar
University Department of Zoology, B.N. Mandal University Madhepura, Bihar, India
Received :02nd July, 2019 ; Revised : 25th August, 2019
Abstract – A wide variety of air breathing organs have been evolved in fishes along with different lineages. Most of these fishes remain in water and uses air as the source of oxygen at variable degrees. And with the evolution of air breathing organs the circulatory system of the fishes have been modified at different levels to accommodate blood to and from the newly developed air breathing surface. However in most of the air-breathing fishes, except snakeheads and lungfishes, seem to lack the ability of separating O2-rich effluent blood of the air breathing organ during the passage of O2 through the central cardiovascular system, although this has been inferred usually only from anatomical studies. The purpose of this paper is to review the current knowledge about the air breathing organs in selected species of airbreathing fishes (eel gobies, mudskippers, swamp eels, snakeheads and lungfishes).