How do you find captain crawfish on his island?

It seems you're referring to Captain Crawfish from the popular video game "Animal Crossing: New Horizons".

Unfortunately, Captain Crawfish doesn't actually have an island in "Animal Crossing: New Horizons." He is a special character who appears on your island during special events like the Pirate Treasure event, which happens during the summer months.

Here's how you can find Captain Crawfish:

1. Make sure it's summer: The Pirate Treasure event only happens during the summer months in the Northern and Southern hemispheres. Check your in-game calendar to see if it's the right time.

2. Watch for announcements: Pay attention to the announcements in the game, as they will let you know when the Pirate Treasure event is happening.

3. Look for a pirate ship: The event involves a pirate ship appearing on your island. Look for it near the beach.

4. Talk to Captain Crawfish: Once you find the ship, Captain Crawfish will be there. Talk to him to start the event.

Remember: Even if it's the right time of year, the event is not guaranteed to occur every day. You might need to keep checking back in the game to see if it's active.

Good luck finding Captain Crawfish!