One common concern among people on low-carb diets is the lack of options when it comes to seafood. Many fish are high in carbohydrates, making them a poor choice for those trying to cut back. But there are several types of fish that have no carbs at all, making them perfect for a low-carb diet. Some of the best options include salmon, trout, mackerel, and herring. These fish are all high in healthy omega-3 fatty acids, which can help improve heart health and reduce the risk of chronic diseases. They're also a good source of protein, making them an excellent choice for anyone looking to lose weight or build muscle. So if you're looking for a healthy and satisfying seafood option that fits into your low-carb diet, be sure to check out some of these carb-free fish.