Classification Characiformes is an order of ray-finned fish, which includes more than 2,000 species in around 22 families. Characiformes are primarily freshwater fish found in South and Central America, Africa, and parts of Asia. The order includes many popular aquarium fish, such as tetras, hatchetfish, and piranhas. One of the largest families within the Characiformes […]
[Ebook] 500 freshwater aquarium fish – Miscellaneous Fish – Silver Arowana (Osteoglossum bicirrhosum)
Two species of Amazonian arowana are available, the Silver Arowana and O. ferreirai (Black Arowana) from the Rio Negro. The adults are very similar, although Silver Arowana is somewhat sturdier looking, with fewer lateral line scales, dorsal and anal fin rays, and vertebrae. Juvenile O. ferreirai exhibit the characteristic black coloration responsible for the common name of the species. Both these arowanas are excellent jumpers that can pluck prey from branches above the water surface. This ability has earned them the local name of macaco d’agua (water monkey).
[Ebook] Encyclopedia of Aquarium & Pond Fish – Directory of Freshwater Fish – Other American species
This varied selection of popular American species demonstrates the amazing adaptability of fish. For example, the Amazon Puffer, whose relatives are confined to marine and brackish waters, has changed its body chemistry to enable it to exploit salt-free environments.