Which is NOT one of the three major objectives of preventative aquatic weed control?

The three major objectives of preventative aquatic weed control typically focus on measures that help manage and mitigate the growth and spread of invasive or nuisance aquatic plants. Among the provided choices, enhancing fish populations is not a direct objective of aquatic weed control.

Preventative control measures aim mainly at stopping the introduction and spread of harmful weeds, which can hinder aquatic ecosystems. Deepening shallow waters and elimination of contaminant sources are both strategies that serve to create a less hospitable environment for unwanted plants. They focus on modifying the habitat and reducing the potential for weed growth.

Preventing the spread of weeds is central to maintaining the balance in aquatic ecosystems, where uncontrolled weed growth can lead to significant ecological issues, including reduced water quality and altered habitats for aquatic life. By focusing on these operational goals, the efforts in aquatic weed control are more aimed at the sustainability of the water body itself rather than directly enhancing one specific component like fish populations.