A piscivore ˈpɪsɨvɔər is a carnivorous

Carnivore

A carnivore meaning 'meat eater' is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue, whether through predation or scavenging...

 animal which eats primarily fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

. Piscivory was the diet of early tetrapod

Tetrapod

Tetrapods are vertebrate animals having four limbs. Amphibians, reptiles, birds and mammals are all tetrapods; even snakes and other limbless reptiles and amphibians are tetrapods by descent. The earliest tetrapods evolved from the lobe-finned fishes in the Devonian...

s (amphibians), insectivory came next, then in time reptiles added herbivory.

Some animals, like the sea lion

Sea Lion

Sea lions are pinnipeds characterized by external ear-flaps, long fore-flippers, the ability to walk on all fours, and short thick hair. Together with the fur seal, they comprise the family Otariidae, or eared seals. There are six extant and one extinct species in five genera...

, or alligator

Alligator

An alligator is a crocodilian in the genus Alligator of the family Alligatoridae. There are two extant alligator species: the American alligator and the Chinese alligator ....

, are not completely piscivorous, while others, like the Aquatic Genet

Aquatic Genet

The Aquatic Genet is a carnivoran mammal from the north-east of the Democratic Republic of the Congo. The Aquatic Genet is related to civets and linsangs. Unlike other genets who have handsomely spotted coats and ringed tails, the Aquatic Genet has a plain, rusty-coloured coat and a black tail,...

, are strictly dependent on fish for food. The name piscivore is derived from the Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 word for fish, "piscis".

Equivalent to the Greek-derived word, ichthyophagous.

Example extant piscivores

• Aquatic Genet
  Aquatic Genet
  The Aquatic Genet is a carnivoran mammal from the north-east of the Democratic Republic of the Congo. The Aquatic Genet is related to civets and linsangs. Unlike other genets who have handsomely spotted coats and ringed tails, the Aquatic Genet has a plain, rusty-coloured coat and a black tail,...
  
  
• Flat-headed Cat
  Flat-headed Cat
  The Flat-headed Cat is a small wild cat patchily distributed in the Thai-Malay Peninsula, Borneo and Sumatra. Since 2008, it has been listed as Endangered by the IUCN due to destruction of wetlands in their habitat...
  
  
• Gharial
  Gharial
  The gharial , , also called Indian gavial or gavial, is the only surviving member of the once well-represented family Gavialidae, a long-established group of crocodilians with long, slender snouts...
  
  
• Osprey
  Osprey
  The Osprey , sometimes known as the sea hawk or fish eagle, is a diurnal, fish-eating bird of prey. It is a large raptor, reaching more than in length and across the wings...
  
  
• African tigerfish
• barracuda
  Barracuda
  The barracuda is a ray-finned fish known for its large size and fearsome appearance. Its body is long, fairly compressed, and covered with small, smooth scales. Some species could reach up to 1.8m in length and 30 cm in width...
  
  
• bulldog bat
  Bulldog bat
  The Noctilionidae family of bats, commonly known as bulldog bats orfisherman bats, are represented by two species, the Greater Bulldog Bat and the Lesser Bulldog Bat. They are found near water, from Mexico to Argentina...
  
  
• merganser
• sea lion
  Sea Lion
  Sea lions are pinnipeds characterized by external ear-flaps, long fore-flippers, the ability to walk on all fours, and short thick hair. Together with the fur seal, they comprise the family Otariidae, or eared seals. There are six extant and one extinct species in five genera...
  
  
• water shrew
  Water Shrew
  Water Shrew may refer to any of several species of semi-aquatic red-toothed shrews:*Asiatic water shrews **Malayan Water Shrew **Himalayan Water Shrew **Sunda Water Shrew...