Schooling behaviour

There are supplementary videos in this paper showing stressed salmon with elevated levels of H2S. Schooling breakdown and erratic behaviour.

https://www.sciencedirect.com/science/article/pii/S0044848623009754?via%3Dihub#ec0005

“Through the use of machine vision, this study demonstrated that Atlantic salmon (Salmo salar) smolts exhibit a behavioral stress response when exposed to dissolved H2S in RAS. This response is characterized by increased swimming speed, erratic patterns, and a loss of schooling behavior. Interestingly, a significant response was observed at 40 μg/L, which is below the toxic threshold of 60 μg/L H2S for salmon. These findings strongly support the idea that machine vision can be a valuable early warning tool, offering the potential to quickly implement necessary safety measures.”