The Latin name of the big dog fish is Carcharhinusleucas, belonging to the order Sharidae. Its English name is bullshark, because bull sharks like to rush forward when hunting, like an angry bull.

The big dog fish has a streamlined body with a gray-black back and a white abdomen. At the same time, it is large, and the largest big dog fish can be as long as 4 meters and weigh about 300 kilograms.

2. The distribution range of big dog fish

The big dog fish is widely distributed and is a global species. They mainly live in deep sea, estuaries, ports, tropical rivers and estuaries and lakes, and have strong adaptability to water flow, and both fresh water and salt water can survive. Especially in the mouth of the Amazon River in South America, big dog fish is very common.

Big dog fish are often found swimming in inland estuaries, lakes and rivers because they can enter fresh water areas to breed and grow. For example, the Mississippi River in the United States has many big dog fish. However, big dog fish also pose a threat to human beings, because they can swim into estuaries, bays and the middle of rivers until they are less than one kilometer away from the shore. In these places, big dog fish may bite swimmers and anglers.

3. Behavioral characteristics of big dog fish.

The big dog fish is one of the fastest sharks in swimming. They are good at chasing prey and are very aggressive. Unlike other sharks, the big dog fish has a very special natural life habit. For example, they can live at the junction of salt water and fresh water, and they can migrate to nearby islands and marine coastlines to find food and breed. Moreover, this shark can sway on land for a few minutes, because their eyes are particularly adapted to the fresh water environment, so when they swim in the fresh water of the earth, they tend to spin in the water, sway their bodies and even March to the shore, which is quite shocking.

4. Ecological function of big dog fish.

Big dog fish plays an important role in marine ecosystem. They are an important part of the marine food chain and the main natural enemies of many species. In addition, big dog fish can also help maintain the balance of marine ecosystem, because they can control the number of certain populations, thus avoiding the problem of overfishing. At the same time, because they can survive in different environments, such as fresh water and salt water, the study of big dog fish is also of great value to ecology and even environmental protection.