When we refer to ‘Fish’, we always mean a aquatic living being. It’s difficult to imagine fish without water. But in reality, there are significant number of fish, that are considered as amphibian than aquatic. These fish spend considerable amount of their lifetime without water.
Mudskipper is a very well known example of amphibian fish which can spend days out of water in wet mud. They are found in tropical, subtropical and temperate regions, mostly in the mangrove swamps of Indo-Pacific and the Atlantic coast of Africa. The modskipper has the ability to breathe through skin, lining of the mouth and throat in wet conditions. They also another special way that enhance their breathing outside water. They have a special cavity behind their ears where sea water is stored. As they rotate their eyes, pressure is applied to that cavity and this reoxygenates the stored water, lubricates the gill flaps and restores the gills to their normal function. The mudskippers can survive upto 4 days out of water! While outside water, they can walk with their pectoral fins, eat food and also fight for their territory.
Another expert amphibian fish is called Lungfish. It is a fresh water fish found in Africa, South America and Australia. Currently there are six surviving species of Lungfishes found around the world. The Lungfishes have limb like fins. They can breathe air with their lungs. African and South American lungfish are capable of surviving seasonal drying out of their habitats by burrowing into mud throughout the dry season upto two years.