Final answer:
Sardines and anchovies are pelagic predators that exclusively feed on zooplankton, living in the open water column of the ocean.
Step-by-step explanation:
Sardines and anchovies are small, pelagic predators that feed only on zooplankton. Both sardines and anchovies belong to the category of fishes that live in the pelagic zone of the ocean, which means they inhabit the water column, as opposed to living near the bottom (benthic) or close to shore (neritic). These fishes are part of a group that consumes zooplankton, which are microscopic organisms drifting in oceans, seas, and bodies of fresh water. Pelagic fish such as sardines and anchovies play a crucial role in the marine food web, and due to their diet consisting exclusively of zooplankton, they are not considered carnivorous like sharks or scavengers like some cephalopods.