I had this at a friend's house and wanted to make it myself.  She gave me her recipe and here it is.

2	lbs.	boneless fish fillets, cut into 1" cubes
1	lb.	shelled shrimp
11/2	lb.	scallops
2	c.	shucked clams
2	cans	diced tomatoes (1 lb. each)
1	c.	white wine
1	c.	chopped onion
1	c.	chopped celery
1/2	c.	olive oil

Put all ingredients in crock pot.  Stir to blend and cover.  Replace lid and cook on low about 3 hours.  Serve in soup bowls.

Yield: 6 to 8 servings