Alex Jordan: „Fish are not stupid, they’re different!“ | Max-Planck-Gesellschaft https://www.mpg.de/17380891/alex-jordan-interview-fish
Alex Jordan is a behavioral ecologist at the Max Planck Institute of Animal Behavior in Konstanz, Germany. His main interest: he wants to know why animals do what they do. He is especially devoted to fish, having been a hobbyist since a young age, and seeing the value of being able to study animals equally well in the wild as in captivity.
Probably the mullet knows in this way that there is no danger