To prepare fish, bring 2 cups water to a boil in a large skillet. Add 1/4 teaspoon salt and fish. Return to a boil; reduce heat, and simmer 8 minutes or until fish flakes easily when tested with a fork. Remove fish from pan. Cover and refrigerate fish until chilled.
To prepare sauce, place 1 cup water in a shallow dish. Dip bread into water, and remove; squeeze bread to remove excess moisture. Combine bread, pine nuts, lemon juice, 1/4 teaspoon salt, pepper, and garlic in a food processor. With the processor on, slowly pour clam juice through food chute, and process until smooth. Serve over chilled fish.