Introduction to grouper: Grouper has an oblong body, flat sides, and sharp teeth in its mouth. There are many blue-yellow spots scattered on the surface of the fish. The spots on the head are dense, and the spots on the sides of the body are larger and sparse. The maximum body length can reach 2 meters, the weight is generally 30-40 kilograms, and the large ones can reach more than 100 kilograms. What's interesting is that its first dorsal fin has turned into a sharp spine, and the outer edge of the operculum has serrations, making it easier to attack and defend. It does not swim very fast and is used to making surprise attacks to catch its prey. Most of these fish like to live in tropical and subtropical coral reef areas.