The Amazon basin is home to over 2,500 species of fish, more species than are recorded for the entire Atlantic Ocean, and some experts estimate that there may be as many as 6,000 species! These range from giant 3-meter air-breathing fish (Arapaima gigas) and river catfish weighing up to 600-700 lbs, to tiny tetras, electric eels, sting-rays, needlefish, fresh-water flying-fish, and knife-fish. The fish fauna of many river systems is poorly known, and new species are discovered yearly, even in the “better-known” areas!