Anglerfish are predominantly found in the deeper zones of the ocean. The most likely zones where you would encounter anglerfish are:
4) mesopelagic and bathypelagic
The mesopelagic zone extends from about 200 meters to 1,000 meters deep, while the bathypelagic zone goes from 1,000 meters to about 4,000 meters. Many species of anglerfish inhabit these darker, deeper waters.