Acipenser sinensis all appeared in the Upper Cretaceous at the end of Mesozoic, about 65.438+0.4 billion years ago. They are very old fish, national first-class protected wild animals and living fossils, and are known as "giant pandas in water".
Acipenser sinensis is mainly distributed below Jinsha River, the main stream of the Yangtze River in China, to the estuary, and other water systems such as Ganjiang River, Xiangjiang River, Minjiang River, Qiantang River and Pearl River occasionally appear.
Acipenser sinensis is the oldest vertebrate on the earth, and it is the descendant of ancient stickleback, the same ancestor of fish, with a history of10.40 billion years. Living in the same era as dinosaurs.
Acipenser sinensis has a series of primitive characteristics, which shows that it is not only a group between cartilaginous fish (sharks, etc.) ) and teleost, also a primitive group of teleost, have important academic value in the evolutionary history of fish. Acipenser sinensis occupies an extremely important position in classification and is an important reference for studying the evolution of fish. It has important scientific value and inestimable ecological and social value in studying the earth changes such as biological evolution, geology, geomorphology, transgression and regression.
But for various reasons, this rare animal is on the verge of extinction. 20 10, IUCN upgraded it to a critically endangered (GR) protected species. Protecting and saving this rare and endangered "living fossil" is of far-reaching significance to the development and rational utilization of wildlife resources and the maintenance of ecological balance.
Chinese sturgeon