1. a very large freshwater fish native to the Amazon River basin, valued as food and sport fish

Examples

• The arapaima is one of the largest freshwater fish in the world.
• Local fishermen caught a massive arapaima weighing over 200 pounds.
• The arapaima can grow up to 10 feet in length.
• Conservation efforts are helping protect arapaima populations in the Amazon.
• The arapaima is also known as pirarucu in Brazil.
• This ancient fish species has survived for millions of years.