Which method can be considered a form of biological control?

Introducing predatory fish is considered a form of biological control because it involves the use of a living organism to manage and reduce populations of unwanted aquatic vegetation. Biological control aims to utilize natural predators or competitors to balance ecosystems and suppress the growth of invasive species. In this case, the predatory fish can effectively consume or compete with the weeds, thus helping to maintain a healthier aquatic environment without relying solely on chemical treatment methods.

This method not only targets specific types of vegetation but also promotes a more sustainable approach to weed management. It minimizes potential negative impacts on the environment that may arise from chemical herbicides, enhancing biodiversity and creating a more stable ecological balance in the water body.