动物实验 z-bo 2020-09-26 376

　　Previously, scientists believed that the Mexican hole bass farm was navigated by sensing changes in water pressure caused by waves driven by its body. However, when the researchers examined them, they found that the previous explanation was unreasonable. For example, big fish will produce big waves and need to be able to detect more obstacles than small fish. In fact, large and small hole bass can detect objects at the same distance.

　　Tel Aviv University researchers have decided to further study this hall-based airless navigation function. They counted the number of times the lobby bathroom opened and closed when approaching a familiar object. Then, the researchers removed the object and observed the movement of the bathtub opening in the hall in an unfamiliar environment. According to the test results, the frequency of opening and closing the mouth of the hall bathroom in an unfamiliar environment has doubled, and the frequency of mouth movement when approaching obstacles exceeds that of movement in an open environment without obstacles. I'm. This shows that this behavior plays an important role in detecting the surrounding environment. Through further analysis, the research team believes that the suction generated by mouth movement has a similar effect to echolocation. Bats and dolphins determine the distance of the object before the sound bounces. Roy Holtzmann, a co-author of the study, told Life Sciences: “It seems that the hole is detected by measuring changes in mouth suction. In this respect, this is different from echolocation, but the two are similar. Hall Bath It is deliberately blowing waves to find obstacles."

　　The research team does not know whether other fish will move in this way. Holtzmann has this ability in some fishes, because all fish can use their mouths to generate suction, and all fish have receptors on both sides of their bodies that can detect changes in water pressure. Claim it is possible. This is a newly discovered mechanism, and it is meaningful for other fish to have this ability. "

　　The research team speculates that fish may passively collect information through waves generated by their body swimming. This has also been proposed in previous studies. Corridor buses may collect information in active and passive ways, such as submarines and navigation. The research team is now using hydrophones to send out fish-sucking signals based on the distance from the obstacle.