Tropical fish are beautiful fish with often bright colors. The live in warm seas with coral reefs to shelter. Show pictures of tropical fish and discuss the anatomy of the fish (gills, fins). Point out the bright colours and sometimes strange shapes of the fish.
Students scetch a fish on their sheet with pencil. Behind the fish they scetch waves. Sketch as thin as possible, so the pencil lines won't show through the colours later. Both the fish and the waves must be coloured with 'spots', drop-like shapes that accentuate the water. About a half cm between the spots should remain white. Colour the waves with different colours blue and green. Colour the spotted fish with warm colours.