Dandong port, Liaoning Province is now a sea lion with a body length of 2 meters. What does the appearance of sea lions mean?

Sea lion is a kind of seemingly naive marine life. It looks like a seal, and people usually see sea lions on TV. Recently, a 2-meter-long sea lion appeared in the sea area of dandong port, Liaoning Province, which caused widespread concern.

Sea lions themselves do not have a very fixed living space. Sea lions generally live in groups, and their temperament is relatively docile, but their eating styles are relatively? Barbarians? Yes, they don't chew food, but swallow it whole. Sometimes they swallow some small stones to help digestion.

Sea lions eat a lot, and most of the time they dive into the sea to hunt, so they often choose areas with sufficient food. Recently, a 2-meter-long sea lion appeared in dandong port, Liaoning Province. Theoretically, it means that there are a lot of marine life such as fish and cephalopods in dandong port, Liaoning Province, which can provide enough food for sea lions, otherwise sea lions will not live in this place.

Through this phenomenon, it can also be indirectly judged that the seawater quality in dandong port, Liaoning Province has improved in recent years. Marine life is very sensitive to seawater quality. Generally speaking, the higher the seawater quality, the more attractive it is to marine life. At present, there are sea lions in dandong port, Liaoning Province, which are two meters long, indicating that the sea area is rich in marine life, which indirectly proves that the seawater quality in dandong port, Liaoning Province is good.

There are many possible reasons for the improvement of seawater quality.

The most direct factor to improve seawater quality is to reduce marine pollution. It is an indisputable fact that human life and production activities have an impact on the natural environment, especially with the rapid development of modern industry, waste gas, waste water and solid pollutants discharged from factories have polluted nature. From acid rain in the past to global warming in recent years? Evidence? All reflect that human pollution to the natural environment is not small.

It is no longer news that the sea water is polluted. In the past, there were many news reports that industrial wastewater, domestic sewage and other sewage were directly discharged into the sea, and there were also oil spills in the sea. These events will undoubtedly lead to the deterioration of seawater quality and the death or variation of marine life.

Now there are sea lions in the sea area of dandong port, Liaoning Province, which is enough to prove that the seawater quality in this sea area is good. On the one hand, sea lions themselves will not choose to live in sea areas with poor seawater quality; On the other hand, if the seawater quality in dandong port is not good, there will not be enough marine life, nor will it attract sea lions who eat a lot to live here.

In addition, the reason for the improvement of seawater quality is not only the reduction of pollution, but also the more reasonable measures of human breeding. Unreasonable aquaculture activities will destroy the marine ecological environment. According to the contents of "20 12 Bulletin on Fishery Ecological Environment in China" issued by the Ministry of Agriculture, the main pollution factors in China's offshore aquaculture areas are inorganic nitrogen and active phosphate. These chemicals are mainly brought into the seawater by human beings in the process of aquaculture, which means that unreasonable mariculture will also become the pollution source of coastal waters.

At present, there are 7 subspecies of sea lions found, but due to the deterioration of natural environment and the killing of human beings, the number of sea lions is decreasing. Among the seven subspecies of sea lions, Japanese sea lions have been extinct, and sea lions have also been included in the IUCN 20 12 Red List of Endangered Species. After the discovery of sea lions in dandong port, Liaoning Province, the local maritime department immediately reminded ships in the nearby waters to avoid sea lions, so as not to disturb them, and also organized forces to rescue them.