In large skillet or wok over medium heat, heat 1 Tbsp. cooking oil. Add half stick butter and garlic and mix well.
Once butter is melted, add cod and cook 2 minutes. Remove and set aside to rest. Reserve butter in pan.
Add scallops and cook 2 minutes. Remove and place with cod. Reserve butter in pan.
Add onion and fennel to skillet and sauté 2 minutes. Add Arborio rice, mix well and slightly toast for about 1 minute.