Discuss how some of the animals under the sea blow bubbles. Explore 'bubble painting' using watery paint, washing up liquid and straws.
Look at the pattern produced by the scales on a fish. Cut out a large fish from paper or cardboard. Use a variety of different materials to cut out scales and stick on the fish.
Cut out a selection of 'shell shapes' and write the numbers to 10 on them. Can the children use a 'bingo dabber', pencil or crayon to put the correct number of spots on the shells?
Design a special 'under the sea' creature on paper or make a model. Which colours will you use? How many fins will it have? Will it be a fish or will you use your imagination and make something unique?