Make the fish out of cardboard or felt, and thread it to the button. For the aquarium, you just need a box. Remove all 8 flaps, then cut windows in the sides and slots for the fish in the top with a box cutter or exacto knife.
This site has TONS of resources for structured play, beginning literacy activities, and hand-eye coordination broken down by age from birth and through school years. Stoplight Beanbag Toss - I Can Teach My Child! I own bean bags already!
Tummy Time Finger Painting Sensory Play Tummy Time Finger Painting for babies :: sensory play, infant activities, handmade gifts for grandparents, baby arts and crafts If you really like arts and crafts you'll will love this cool site!