Above, a tambaqui fish fresh out of a normal breeding tank. Below, the same animal, more stressed and darker after 10 days in a 2,000-liter confinement tank. Credit: Celma Lemos/CAUNESP In Brazil, a group led by researchers from São Paulo State University (UNESP) in Jaboticabal, in collaboration with the Brazilian Agricultural Research Corporation (EMBRAPA), has developed an artificial intelligence (AI) tool to assess the stress levels of tambaqui (Colosso