Although the whale is very big in size, we cannot count it as the world’s largest fish, because the whale is a mammal. The fish called the whale shark is known to be the largest fish ever found. It often grows to a length of 45 to 50 feet and weighs over 30,000 pounds.
This huge fish eats only small plants and is completely harmless to man. The man-eating shark is much smaller up to 20 to 25 feet in length and weighs about 7,000 pounds.