Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports. Native to southeast Asia, this species is known for its range of vibrant hues. There ...

Tetras are one of the most popular and diverse types of freshwater aquarium fish. With more than 150 unique types of tetra fish of varying colors, shapes, and sizes, they make a great addition to any ...

Different breeds of tropical fish have very different lifespans. It is estimated that around 10 per cent of British households own pet fish – making them the third most popular animal to welcome into ...

Scientists caught an “armored” river creature with a maze-like pattern, a popular aquarium pet, in Brazil and discovered a new species. Photo from Getty / iStockphoto In a river of northeastern Brazil ...