Which of the following is NOT a method to neutralize a piscicide applied to water?

In the context of neutralizing a piscicide, it is important to understand the available methods and how they function. Dilution refers to the process of reducing the concentration of a substance by mixing it with a larger volume of water. This method can effectively lessen the harmful effects of a piscicide in treated water.

Natural degradation involves the breakdown of the chemical compound through various environmental processes, including microbial activity or environmental factors like sunlight. This process can help reduce the toxicity over time.

Detoxification is a technique where specific substances or methods are used to convert harmful chemicals into less harmful forms, effectively neutralizing the toxicity of the piscicide.

Increased pressure, however, does not provide a means to neutralize a piscicide. While pressure can influence the physical state or solubility of materials in some contexts, it does not inherently neutralize or reduce the toxicity of the toxins found in piscicides. Therefore, it is not recognized as a viable method for mitigating the effects of a piscicide, establishing it as the correct answer to the question.