Bizarre Air Breathing Fish! - YouTube.
In fishes, exploitation of aerial gas exchange has evolved independently many times, involving a variety of air-breathing organs. Indeed, air-breathing occurs in at least 49 known families of fish.
Lungfish, (subclass Dipnoi), any member of a group of six species of living air-breathing fishes and several extinct relatives belonging to the class Sarcopterygii and characterized by the possession of either one or two lungs. The Dipnoi first appeared in the Early Devonian Epoch (about 419.2.
Fishes use unimodal water breathing, unimodal air breathing, and a wide range of bimodal combinations of water and air breathing to obtain oxygen. This essay seeks to provide a theoretical framework.
The author gives an excellent general idea of air-breathing biology. With the evolution of air-breathing capacity in fishes, the circulatory system has also been adapted in various ways, in order to accommodate blood to and from the newly developed air-breathing surface.
Most fishes that can breath air are found in oxygen poor waters, like swamps, peaty bogs, and many higher temperature waters, where soluble oxygen concentration is low. Or where the weather is extreme, and the pondings will dry up. Some of these f.
Not all air breathing fish show this mechanism as some Dipnoi, lungfish for example, will still ventilate using the primitive two-stroke mechanism (Burggren and Johansen, 1986) and even though there can be mixing of expired and fresh air in the lungs, there has been no significant evidence to suggest that this is any less effective than the four-stroke method as breathing accessories allows.
An Essay on Phylum Chordata. 2990 words (12 pages) Essay in Biology.. Fishes or fish-like aquatic forms with paired as well as median fins, gills. Female with mammary glands which secrete milk for suckling the young. Heart 4-chambered. Warm blooded. Air breathing vertebrates. 4500 species. Echidna (spiny anteater), Macropus (kangaroo.