Beluga sturgeon is historically the largest freshwater fish on Earth. This sturgeon once grew over 23 feet and weighed thousands of pounds, though modern populations rarely reach that size.

Where Do Whale Sharks Mate? the Search to Learn Where the Magic Happens for the World's Biggest Fish JAMESTOWN, St. Helena (AP) — Whale sharks shouldn't be hard for scientists to find.

They're the biggest fish in the sea — and found in warm oceans all around the world. But some things about them remain a ...

JAMESTOWN, St. Helena (AP) — Whale sharks shouldn’t be hard for scientists to find. They are enormous — they are the biggest fish in the sea and perhaps the biggest fish to have ever lived.