Sauté celery, onion, and garlic in margarine until translucent.
Add pollock and cook for 5-7 minutes.
Add shrimp and cook for 2 minutes.
Drain most (but not all) of liquid from pan.
Stir in shrimp base and peppers. Fold in croutons and breadcrumbs. Fold in crab meat.
NOTES: Joe's Crab Shack uses this stuffing to make their Crab Balls (roll stuffing into 1-inch balls, roll in flour, and deep-fry until brown), their Crab Stuffed Shrimp (peel and devein uncooked shrimp, slice down middle the opposite site you deveined, lay shrimp cut side up in a small oven-proof dish, press 1 tablespoon stuffing into each shrimp cut, brush with melted butter, and bake in 375° F oven for 15 to 20 minutes or until browned), and their Crab Stuffed Shrimp Embrochette.Makes 4 to 6 Source: