https://phys.org/news/2018-07-zebrafish-interactions-social-behavior-disorders.html

The discovery is detailed in a paper published online July 26 by the journal Current Biology.

Early in the National Institutes of Health-funded study, lead author Sarah J. Stednitz, a doctoral student, noticed a regular pattern of behavior between two fish interacting socially. When placed in adjacent tanks they engaged in a get-to-know-you swimming pattern, despite the presence of a clear dividing panel between the fish.