In 3 1/2 to 4-quart slow cooker, combine oil, leek and garlic; mix well. Top with carrots, tomatoes, bell pepper, fennel seed, bay leaf, wine and clam juice. Stir to combine.
Cover; cook on low setting for 8 to 9 hours.
About 20 minutes before serving, add cod, shrimp, sugar, basil, salt and hot pepper sauce; stir gently to mix. Increase heat setting to high; cover and cook an additional 15 to 20 minutes or until fish flakes easily with fork. Remove bay leaf; stir in parsley.