The Latin name of the big dog fish is Carcharhinusleucas, which belongs 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. The largest big dog fish can be as long as 4 meters and weigh about 3 kilograms.

2. The distribution range of the big dog fish

The big dog fish has a wide distribution range 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 can survive in both fresh water and salt water. Especially in the mouth of the Amazon River in South America, big dog fish is very common.

because big dog fish can enter fresh water areas to breed and grow, they are often found swimming in inland estuaries, lakes and rivers. For example, there are many big dog fish in the Mississippi River in the United States. However, the big dog fish also poses 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 the 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. Different from 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 kind of shark can swing 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 often spin in the water, swing their bodies, or even March ashore, 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 fresh water, salt water and other different environments, the study of big dog fish is also of great value to ecology and even environmental protection.