1* There are 450+ kinds of fishes, who can change their gender at any time by their wish.
2* The catfish have 27,000+ taste birds. They have taste birds on their whole body. They can taste anything without open their mouth. 🐟🐟🐟🐟🐟🐟🐟🐟🐟🐟🐟🐟🐟
Three* There is one type of Pufferfish, which has liked puff. They have a lot of poison as more than sinister poison; by that poison, this fish can kill 30 people similarly.
Here the puffer fish⬆
Four* There is one kind of fish that can survive in both water and on land both. Her name was lungfish. 
They can stay on both lands and water because they have lungs and gills both.
Five* Antarctic fish which has antifreeze in blood, by the help of that, they would be able to survive in -1° temperature.
Some basic about fish:
The earliest organisms classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked an actual spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods.
Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change. However, some large active swimmers like white sharks and tuna can hold a higher core temperature.[1][2] Fish can acoustically communicate with each other, most often in the context of feeding, aggression, or courtship.[3]
Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., cusk-eels and snailfish). However, no species has yet been documented in the most profound 25% of the sea.[4] With 34,300 described species, fish exhibit greater species diversity than any other group of vertebrates.[5]
Fish are an essential resource for humans worldwide, especially as food. Commercial and subsistence fishers hunt fish in wild fisheries or farm them in ponds or cages in the ocean (aquaculture). They are also caught by recreational anglers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and subjects of art, books, and movies.
Tetrapods emerged within lobe-finned fishes, so cladistically, they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds, and mammals which all descended from within the same ancestry). Because in this manner, the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology unless it is used in the cladistic sense, including tetrapods.[6][7] The traditional term Pisces (also ichthyic) is considered a typological but not a phylogenetic classification.
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