In a pot over medium heat, add the crabs, shrimp, fish, and mussels. Stir until the color changes.

Add the chopped onion and stir, then add the carrot, celery, and garlic. Continue stirring.

Add all the spices, then add the butter and mix everything well.

Add water and adjust the salt to taste.

Mix the flour into the milk, then add this mixture to the pot along with the cream.

Let it boil for 5 minutes, then turn off the heat.

Serve in bowls with spaghetti in white sauce on the side.