Show the preschoolers a fish tank with live goldfish. Tell them that these are goldfish and ask them if any of them are familiar with the fish. Ask the children to observe the colors and body shapes of the goldfish. Some goldfish have an egg-shaped body and others have a flat body shape.
Have the preschoolers observe how the fish swim and the way they move their tails and fins. Ask them to count how many fins a goldfish has - a goldfish has paired pectoral and pelvic fins, one dorsal fin, one anal fin and one caudal fin.
Point out the way the goldfish open and close their mouths. Tell the children that goldfish, like most other fish, use gills to breath.
Tell the preschoolers that goldfish hatch from eggs. The female lays thousands of eggs and these hatch within 3-4 days.
Inform the children that they should never try to touch the goldfish as this can harm the fish. Goldfish have a slimy protective covering layer that can be damaged if touched.
Tell the preschoolers that the goldfish sleep with their eyes open, and that, apart from regular fish food, they can eat peas, green leafy vegetables, brine shrimp and worms.