[Fondueset]

Once you know the names of the fish you can find all sorts of photographs of them on the internet - then when you dive you will learn what they look like underwater. Likewise when you spot fish underwater you can look them up later. Obviously you'll need to familiarize yourself with the local regulations. If you don't understand some of them (and they can be written in very confusing ways) just contact the authorities for your area and ask for an explaination.