Before the earthquake on earth, sometimes we will see some abnormal animal activities, such as a large number of toads and frogs crossing the streets on a large scale, cattle and horses and other livestock showing uneasiness, and so on. Japan is an island nation deeply affected by earthquakes, and since ancient times, the phenomenon of deep-sea fish being found in shallow seas or washed off the coast is a sign of a major earthquake, and local residents have attributed the anomalies of as many as 45 species of deep-sea fish to the ability to predict earthquakes. Not long ago, in Tottori Prefecture, Japan, a video of the activities of the "king band fish" deep-sea fish was filmed at a fishing port, which caused concern among locals.
<h1 class="pgc-h-arrow-right" data-track="4" > about "kingfish"</h1>
In fact, "king band fish" is just a kind of image title for it, the reason is that from the appearance point of view, it has many similarities with the common marine belt fish. However, from the biological classification point of view, the striped fish is the striped fish, the royal striped fish is the royal striped fish, the former belongs to the perch banded fish family, and the royal striped fish belongs to the lunar fish order Royal band fish family, the two are different from the biological "order", so their relatives are very distant.
From the morphological point of view, there are also obvious differences between striped fish and royal striped fish. For example, the mouth of the fish is relatively large, the mouth is relatively pointed, has a large number of sharp teeth, the tail is also relatively slender, the body side is flat like a belt, the color is basically silver gray, and the body also has small spots. The mouth of the royal band fish is relatively small, showing a rounded and blunt shape, there are no teeth in the mouth, there is no fin, the dorsal fin is not connected to the tail fin, the dorsal fin is red, and the length is much longer than that of the striped fish.
From the perspective of distribution area, the distribution of striped fish is more extensive, and they can be seen in the western Pacific Ocean and the Indian Ocean, while the kingfish are mainly distributed in the tropical deep sea and are not easy to see in the offshore sea. The length of the king band fish can generally reach more than 2 meters, of which the longest king of the herring king belt fish can reach 6 meters and weigh more than 200 kilograms. Because they are uncommon and large, they are often associated with sea monsters in ancient and modern times, when they were found.
The body shape of the king band fish, there is a more obvious feature, that is, the "hairstyle" of the head is very special, their dorsal fin extends to the part of the head, showing a crown, and the fins here are longer than the dorsal fins in the upper part of the body, just like a "fashionable" ornament, which looks particularly windy.
Kinghead fish generally live in the tropical and subtropical deep seas, generally inhabit depths ranging from hundreds of meters to 1000 meters, mainly feeding on some small fish, crustaceans and cephalopods in the deep sea, especially preferring to prey on krill. When preying, its body appears vertical, and then it sucks in its prey with its mouth, filters the seawater with gill rakers, and swallows the rest of the food.
Kinghead fish enter the mating season in November of each year, and a large number of kinghead fish gather near Savai Island in the South Pacific to mate, while fertilized eggs and juveniles float on the surface of the ocean to grow and develop, and then gradually swim to the deep sea areas of other seas.
<h1 class="pgc-h-arrow-right" data-track="20" > kingfish are difficult to see offshore</h1>
The main reason why it is difficult to see kingfish offshore is that their main living area is still concentrated in the deep sea. Due to its long-term life in the dark deep sea, the body surface of the kingfish is not covered with scales, nor is there an external nostril, lateral line and other receptors, and its sensitivity to light is very low. They mainly rely on constantly swallowing seawater to obtain certain special chemical signals in the surrounding seawater, and then determine their own direction of action according to the nature, intensity and change characteristics of these signals.
Kingfish have been named as early as the 1770s, but the first recorded observations were postponed until 1996, when a diver photographed it in the waters off the Bahamas. At present, the in-depth study and dissection of the king band fish are only derived from individuals who have been washed ashore by the sea. Other information about the king band fish, at most when and where it was seen, as well as the size and size of the king band fish, so it is basically a long distance and vague conclusions.
<h1 class="pgc-h-arrow-right" data-track="21" > is the appearance of kingfish related to earthquakes? </h1>
Although from the results of some studies, there are some animals in the world that can produce some feedback physiological signals for weak changes in the structure and temperature of the formation before the earthquake, which push them to change their behavior. However, there is no accurate conclusion as to whether the changes in the activity of deep-sea fish are related to earthquakes.
Japanese scientists have done in-depth research, from the 1920s to the beginning of this century, more than 80 years, the monitoring or accidental discovery of more than 200 deep-sea fish appeared time, and about 200 earthquakes in Japan during this period, the results found that there is no obvious correlation between the two, more is a coincidence, after all, the frequency of earthquakes in Japan is too high, if the biological activity law changes, associated with it, then this "coincidence" in other animals the probability of appearing , the same result will be achieved.
In fact, pushing deep-sea fish into the shallow sea area or even washed ashore by seawater, the main reason is the change in the marine ecological environment, such as changes in sea temperature, abnormal ocean currents, under this action, some of the marine organisms including plankton habitat area, but also changes accordingly, those who feed on this deep-sea fish, in the process of chasing food, there will be some departure from the original traditional movement route, so that people are discovered.
For example, in recent years, the United States has also found stranded kingfish on beaches in California. Local researchers speculate that it is due to el Niño that the temperature of the tropical surface seawater rises, while the water temperature in the deep sea area has dropped, and the kingfish follow the food movement of the seawater, and eventually come to the surface of the seawater, and get closer and closer to the land, and eventually some are washed above the coast by the seawater.
Therefore, Japan's observation of the kingfish in the shallow sea cannot be fundamentally related to the earthquake, and scientists need to conduct in-depth research and analysis on the living habits of the kingfish, the changes in the physical and chemical characteristics of the seawater and the changes in the marine ecosystem, which may soon bring us accurate answers.