Not all "vampires" reside in Transylvania; some infest underwater pens of farmed salmon. Tiny parasites called sea lice make life miserable for both farmed and wild fish, weakening adults and

Not all "vampires" reside in Transylvania; some infest underwater pens of farmed salmon. Tiny parasites called sea lice make life miserable for both farmed and wild fish, weakening adults and killing juveniles.

These bloodsuckers pose a dual threat: the lice themselves harm fish, and the pesticides used to control them can be toxic to other marine life. Their prevalence signals a critical need for improved practices in certain salmon farms.