such as fins.
take 2 pieces of construction paper (white if you would prefer to let the kids color them themselves & colored paper for another look) cut out both of them into fish shapes. staple them all the way around except for the tail end. let the kids stuff them with crumpled newspaper till they are completely filled, then staple the tail end together.
take 2 paper plates and cut the inner circle out. tape blue cellophane to on to the inside of each plate. glue or tape fish and seaweed to inside and then tape outside paper plates together.
take bubble wrap and cut out two fish shapes and glue both 