Are there certain fish that can live without water?

Yes, for a limited time. Every year, the mangrove killifish spends many months out of the water, dwelling underneath decaying branches and tree trunks. The 2-inch (5-centimeter) long fish generally dwells in muddy pools and flooded crab burrows in Florida, Latin America, and the Caribbean mangrove swamps. When their pools of water dry up, they temporarily modify their gills to store water and nutrients while excreting nitrogen waste through their skin. When they return to the water, these modifications are reversed. The mangrove killfish is not the only fish that can live in the absence of water.

Southeast Asia's walking catfish possesses gills that allow it to breathe both air and water. The enormous mudskippers of Southeast Asia breathe underwater through their gills and on land by receiving oxygen through their skin and the back of their mouth and throat. Several fish are amphibious, which means they can exist outside of water, according to Andy Turko of the University of Guelph in Ontario, Canada.