Fish vary in size enormously. The smallest is the dwarf pygmy Goby fish, found in Philippines.

It is less than 8 m.m long. Three such fish placed end to end will still measure less than an inch!

At the other extreme is the whale shark which can be more than 60 feet long.

It weighs 5,000,000,000 times as the goby fish does!

Despite the size and mass, whales feed on plankton and are not real fish but mammals.