All along, many environmentalists and scientists believe that fish in the sea around the world are declining, at an alarming rate. The researchers attributed this decline to overfishing and statistics on errors. One reason is that while the statistical imprecision of the dark ocean, you do not know what happened in the sea。

In the past, researchers have detected some of the fish's sensing system, but the detection range is confined to the scope of 100m2, and MIT is that this new type of sensor system expanded to 10000m2, and also can trace the fish group size and number. In the past, a fish out of the screen may be just a pixel, and now, it is the entire screen。

Whether the new method is still the old method, are dependent on the sonar technology, which can locate objects, the sound waves through the body. Past the traditional technology, sending high-frequency sonar beam research vessel into the sea, where the sound will lose a lot of comparison, the new systems use ultra-low-frequency sonar to track the distance and still be able to return more useful information , the signal is still strong, can "illuminate" a greater area of ocean larger than the previous method 100 times, the image can be updated per second, so to provide researchers a new way to fast track the fish groups, monitoring the number and shape change。

The technology is not the first developed to study fish, the researchers could have been prepared to use its Long Island, New York, to study the structure of the southern continental shelf waters, looking for the ancient river bed of the ocean floor, but when they first use, they Search the image does not show any any bed, but saw the fish, hundreds of million fish. For the first time scientists can see through the screen formed by the image of a large number of fish。