Which Act prevents anyone from placing harmful substances in water that could cause adverse effects to fish?

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The key idea is protecting fish and their habitat by prohibiting polluted discharges into their waters. The best answer is the Fisheries Act because it specifically prohibits depositing a deleterious substance into water frequented by fish or into any area where it could adversely affect fish, including their habitat. This focus on substances entering aquatic environments and harming fish is central to the Act, and it covers discharges from various activities, often requiring authorization or compliance if a prescription under the Act is involved.

Environmental Protection Act covers broader environmental protection and pollution control in general, but its scope is not as direct about protecting fish habitats from deleterious discharges as the Fisheries Act. Water Resources Act deals with managing and allocating water resources, licensing uses of water, and related management, rather than preventing harmful deposits into water specifically to protect fish. Wildlife Protection Act centers on wildlife protection in a broader sense and does not specifically target water contamination affecting fish.