Pulgar, JoséManríquez, Patricio H.Widdicombe, StephenGarcía-Huidobro, RobertoQuijón, Pedro A.Carter, MauricioAldana, MarcelaQuintanilla-Ahumada, DiegoDuarte, Cristian2023-09-202023-09-202023-08Marine Pollution Bulletin, Volume 193, August 2023, Article number 1151900025326Xhttps://repositorio.unab.cl/xmlui/handle/ria/53265INDEXACIÓN: SCOPUS.Artificial Light at Night (ALAN) alters cycles of day and night, potentially modifying species' behavior. We assessed whether exposure to ALAN influences decision-making (directional swimming) in an intertidal rockfish (Girella laevisifrons) from the Southeastern Pacific. Using a Y-maze, we examined if exposure to ALAN or natural day/night conditions for one week affected the number of visits and time spent in three Y-maze compartments: dark and lit arms (“safe” and “risky” conditions, respectively) and a neutral “non-decision” area. The results showed that fish maintained in natural day/night conditions visited and spent more time in the dark arm, regardless of size. Instead, fish exposed to ALAN visited and spent more time in the non-decision area and their response was size-dependent. Hence, prior ALAN exposure seemed to disorient or reduce the ability of rock fish to choose dark conditions, deemed the safest for small fish facing predators or other potential threats. © 2023 Elsevier Ltd.enALANBody sizeDecision-makingIntertidal fishScototaxisArtículoAtribución-NoComercial-SinDerivadas 4.0 Internacional (CC BY-NC-ND 4.0)10.1016/j.marpolbul.2023.115190