Which type of pesticide is used to control predaceous animals, primarily mammals?

The term "predacide" refers specifically to a class of pesticide designed to manage populations of predatory mammals. This type of pesticide is tailored for use against predaceous animals that might negatively impact livestock, wildlife, or agricultural interests. Predacides typically work by attracting these mammals to bait that may contain toxic substances, effectively controlling their population.

In contrast, the other options do not serve the same purpose. Insecticides are aimed at controlling insect populations, rodenticides target rodents, and piscicides are formulated for use in aquatic environments to manage fish populations. Each of these pesticides is designated for specific types of pests and does not address the issues posed by predatory mammals, making predacide the appropriate choice for controlling such animals.