1, farmed fish are generally fat because of their rich feed and nutrition, while reservoir fish are often thin because of their full competition in the natural environment.
2. The fish raised artificially has a high fat content. Not only the abdominal cavity and fish intestines are full of fat, but even the fish skin may be thick with fat, and even the fish belly is mainly fat. However, due to the lack of food, wild fish often have low body fat content, less intestinal and abdominal fat, and less fat on fish.
3. Because the feed of farmed fish has high fat content, it will lead to high cholesterol, large gallbladder, much bile and strong color. Wild fish have smaller gallbladder, less bile and lighter color.
4. Because the cultured fish eat artificially mixed high-fat and high-protein feed, they eat much and feed regularly, so the digestion and absorption rate are low. Therefore, excrement is often dark and has a strong fishy smell. The fish in the reservoir eat pure natural food, with less food intake, full digestion, light defecation color and much lighter fishy smell. If you carefully observe the water quality of the fish pond, you can notice it.