An aquaculture facility hatched salmon eggs and tagged and released young fish into a river leading to the ocean. the fish fed and grew in the ocean, and in a few years some of the fish returned to the facility whereas some were found at other locations. because the number of returning fish was low and the facility wanted to increase the rate of return to the facility, a scientist suggested adding a chemical to the river that would

enable them to imprint on the facility

Explanation:

The addition of the chemicals to the river will help the fishes to recognize that this was their native habitat where they got birth and grew. This will act as a imprint formed by the facility which will help the fishes to recognize the water of the facility. This will help in increasing the number of fishes which return back to the facility.

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