Fish can be divided into groups - white fish and oily fish. White fish can be flat or round. Oily fish are round. To scale a fish, with the back of a knife scrap along the fish - tail to head.

A sleek, powerful fish, the marlin is deep blue on the upper half of its body and silvery white underneath. The marlin's body is densely covered with bony scales. It has a long, sharp-pointed bill and ...