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An increas­ing amount of anti-depres­sant drug residue in the water is mak­ing fish cow­ard­ly and ner­vous, accord­ing to a new study.

Lund University’s Jerk­er Vin­ter­stare stud­ied how the behav­ior of cru­cian carp fish when exposed to such phar­ma­ceu­ti­cals was sim­i­lar in nature to their nat­ur­al stress response to being threat­ened by a predator.

In his paper, Vin­ter­stare ana­lyzes how the neu­ro­trans­mit­ter sero­tonin, an ingre­di­ent of SSRI drugs, affects the fish.