Ohio Commercial Pesticide Applicator Category 3a – General Aquatic Pest Control Practice Exam

Introducing herbivorous fish into the ecosystem is a recognized method for biological control of aquatic weeds. This strategy leverages natural predators that can effectively reduce the population of invasive or problematic aquatic plants. These fish, which typically feed on specific types of vegetation, help to maintain the balance of the aquatic ecosystem by naturally regulating plant growth.

The primary advantage of this approach is that it minimizes the need for chemical herbicides, which can have broader ecological impacts and may harm non-target species. By introducing these species, one can enhance the sustainability of the control method, as it can lead to longer-term management of aquatic weed problems without continuous human intervention or chemical application.

Other methods such as mechanical harvesting or the use of chemical herbicides provide alternative management strategies, but they do not align with the principles of biological control which emphasize the use of living organisms to manage pests. High-pressure water jets, while effective in some cases, function mechanically rather than biologically.