What is one method to manage aquatic pests without using chemicals?

Implementing biological control methods is a widely recognized strategy for managing aquatic pests without the use of chemicals. This approach utilizes natural predators, parasites, or pathogens to target and reduce pest populations. For instance, introducing specific fish species that feed on invasive plants or pests can help maintain a balanced ecosystem while limiting the growth of harmful species.

Biological control is advantageous because it often leads to longer-lasting solutions and reduces the risk of chemical runoff or secondary effects on non-target species, which can occur with synthetic herbicides. In contrast, the other options involve methods that do not align with the goal of chemical-free pest management. Using synthetic herbicides directly introduces chemicals into the environment, which is contrary to the intent of seeking non-chemical alternatives. Ignoring pest populations can result in worsening infestations and ecological imbalances, posing more significant long-term challenges. Utilizing surface barriers can be effective but often involves physical modifications that may not be sustainable in the long run. Overall, biological control represents a holistic approach, leveraging natural interactions to effectively manage aquatic pests.