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from The Telegraph

Environment

Potamotrygon Leopoldi: The Polka Dot Ray is a species of fish in the Potamotrygonidae family. It is endemic to Brazil. Its natural habitat is rivers. It is threatened by habitat loss.

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Bala Shark, (Balantiocheilus melanopterus) Species Profile, Bala Shark, (Balantiocheilus melanopterus) Care Instructions, Bala Shark, (Balantiocheilus melanopterus) Feeding and more.  ::  Aquarium Domain.com

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Rainbow Shark, (Epalzeorhynchos frenatus) Species Profile, Rainbow Shark, (Epalzeorhynchos frenatus) Care Instructions, Rainbow Shark, (Epal...

The red-tailed shark (Epalzeorhynchos bicolor). A striking fish. These get to 4". Are peaceful to other fishes when small, but semi-aggressive as adults. Should be kept with fishes of similar temperament. One specimen per tank or in schools of 8 or more; otherwise, weaker individuals get picked to death by the dominant individual.

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from Mail Online

Incredible photographs show a school of fish forming a 'tornado'

A school of fish together in the Cabo Pulmo marine protected area in Baja California...

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