Find a kilo of sand and put it in the basin. Fill a large glass jar with sand and stones, water, sea salt and seaweed, and you can raise limulus by yourself. Put the limulus into a glass jar and buy some shrimps to feed every day. Shrimp or small fish go from head to tail. After a week, take out the horseshoe crab, put it in a basin and put it back.

If the horseshoe crab is in the breeding season, catch a horseshoe crab of the opposite sex to mate with it, but the horseshoe crab must mate and lay eggs in the sand. Don't forget to take it out. Then feed two mated horseshoe crabs separately or release one. Small hoofed crabs must be separated from big hoofed crabs when they are born, otherwise big hoofed crabs will eat small hoofed crabs.