For a richer flavor, try using a combination of white fish, such as cod and haddock, or add a touch of smoked paprika to the fish mixture. If the fish mixture is too wet, add more panko bread crumbs, one tablespoon at a time, until it reaches the desired consistency. Be sure to maintain the oil temperature at 350°F (175°C) for optimal frying. If the oil is too cold, the fish balls will absorb too much oil and become greasy. If the oil is too hot, they will brown too quickly on the outside and may not be cooked through on the inside. Serve immediately with your favorite dipping sauce, such as tartar sauce, sweet chili sauce, or a squeeze of fresh lemon juice.