What aquatic conditions can limit the effectiveness of rotenone?

High levels of turbidity can significantly limit the effectiveness of rotenone in aquatic environments. Turbidity refers to the cloudiness or haziness of water caused by a high concentration of suspended particles, such as silt, algae, or organic matter. When water is turbid, the dispersal of rotenone can be impeded because the particles can absorb or bind the pesticide, reducing its availability to target organisms such as fish.

Moreover, the presence of turbidity can hinder the rotenone from reaching its intended target effectively, as it may not evenly penetrate the water column or surround the fish. Additionally, if the effectiveness of a pesticide is compromised, it could lead to incomplete control of fish populations, resulting in ongoing ecological issues.

In contrast, clear water with good visibility allows for better distribution and effectiveness of rotenone because there are fewer particles that could interfere with the pesticide's action. The presence of drifting fish and low water currents do not inherently limit the effectiveness of rotenone, although these conditions may influence the behavior and movement of the target organisms.