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Fish gills are organs that allow fish to breathe underwater by exchanging oxygen and carbon dioxide with water. Learn about the structure, function, and evolution of fish gills, and how they differ among different fish groups.
Learn how fish circulate blood and exchange gases using gills, lungs, or swim bladders. Compare different types of fish breathing mechanisms and adaptations to various environments.
A gill is a structure that allows aquatic organisms to extract oxygen from water and excrete carbon dioxide. Learn about the types, functions, and evolution of gills in different groups of animals, such as fish, mollusks, crustaceans, and amphibians.
Fish exchange gases using gills on either side of the pharynx, forming the splanchnocranium. The gills are tissues with threadlike filaments that have many functions and are involved in ion and water transfer as well as oxygen, carbon dioxide, acid and ammonia exchange.
However, non-facultative fish must respire at the surface even in normal dissolved oxygen levels because their gills cannot extract enough oxygen from the water. Many air breathing freshwater teleosts use ABOs to effectively extract oxygen from air while maintaining functions of the gills.
Learn about fish, aquatic vertebrates with fins and gills, from jawless to jawed, from ancient to modern. Explore the fossil history, phylogeny, and cultural significance of fish and their relatives.
Dr. Charles Bangley works at the Smithsonian Environmental Research Center in the Fish Ecology Lab and has a couple tips that will keep you more conscientious of your surroundings and prepared for ...
Countercurrent exchange is a mechanism of transferring heat or other properties between two flowing streams in opposite directions. Learn how it works, why it is more efficient than cocurrent exchange, and see applications in nature and engineering.
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