You can use vegetable oil, peanut oil, olive oil, grapeseed oil, or canola oil. All of these oils have a high smoke point, which ensures that they won’t burn while you are stir-frying at a high heat. Don’t use oils with a low smoke point like walnut oil, pumpkin seed oil, and flaxseed oil, which could burn while you are cooking. Save those oils for salad dressings, especially since they may also have strong flavors that could compete with the salmon and vegetables.