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A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
Guppy. The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
NordSüd Verlag. Publication date. 1992. Publication place. Switzerland. ISBN. 978-3314015441. The Rainbow Fish is a children's picture book drawn and written by Swiss author and illustrator, Marcus Pfister, and translated into English by J. Alison James. The book is best known for the distinctive shiny foil scales of the Rainbow Fish.
Fishes of the World. Fishes of the World is a standard reference for the systematics of fishes. It was first written in 1976 by the American ichthyologist Joseph S. Nelson (1937–2011). Now in its fifth edition (2016), the work is a comprehensive overview of the diversity and classification of the 30,000-plus fish species known to science.
The largest fish of the now-extinct class Placodermi was the giant predatory Dunkleosteus. The largest and most well known species was D. terrelli, which grew almost 9 m (29.5 ft) in length [21] and 4 t (4.4 short tons) [22] in weight. Its filter feeding relative, Titanichthys, may have rivaled it in size. [23]
Angler catfish (genus Chaca) Anglerfish (order Lophiiformes) Antarctic cod. Antarctic icefish (suborder Notothenioidei of order Perciformes) Antenna codlet (Bregmaceros atlanticus) Arapaima (genus Arapaima) Archerfish (genus Toxotes and family Toxotidae) Arctic char. Armored gurnard (family Peristediidae)
A 1000-kg, 4.17-m-long beluga fish from the Volga River (National Museum of Tatarstan, Kazan, Russia) Among all extant bony fishes, the beluga sturgeon rivals the ocean sunfish (Mola sp.) as the most massive fish and is the second-longest bony fish after the giant oarfish (Regalecus glesne). It is the largest freshwater fish in the world.
Perilamopus striatus. The zebrafish (Danio rerio) is a freshwater fish belonging to the minnow family (Cyprinidae) of the order Cypriniformes. Native to South Asia, [2] it is a popular aquarium fish, frequently sold under the trade name zebra danio[3] (and thus often called a "tropical fish" although it is both tropical and subtropical).