What substance can eliminate toxic effects of piscicides almost immediately?

The correct choice is potassium permanganate. This substance acts as an oxidizing agent that can neutralize the toxic effects of piscicides by breaking down their chemical components. When introduced into water, potassium permanganate reacts with various organic and inorganic substances. This interaction effectively reduces piscicide toxicity, thereby protecting non-target species and aiding in the detoxification process.

In aquatic environments, the swift action of potassium permanganate is particularly crucial, as it facilitates the recovery of the ecosystem and promotes a safer habitat for fish and other aquatic organisms. Its ability to rapidly oxidize and render harmful chemicals harmless highlights its unique role in aquatic pest management.

Other substances listed, while having their own applications in various contexts, do not possess the same immediate detoxifying abilities for piscicides. Understanding the specific roles and mechanisms of these chemicals is vital in effective pest management strategies in aquatic ecosystems.