What is a significant drawback of using piscicides in warm water?

Using piscicides in warm water can indeed be less effective against certain fish species, which makes this the correct choice. Warm water conditions can influence the behavior and physiology of fish, potentially reducing their susceptibility to certain chemicals used in piscicides. For instance, some fish may become more active in warm water, leading them to evade exposure to the toxicants or to metabolize them more rapidly, thereby diminishing the effectiveness of the treatment. Additionally, physiological stress responses in fish can vary with temperature changes.

Other considerations may include factors like toxicity levels, cost, or chemical interactions in warm water environments, but these do not directly address the effectiveness specific to certain fish species exposed to piscicides in those conditions. Understanding how temperature affects the efficacy of piscicides is crucial for successful fish management and pest control strategies.