Final answer:
The statement is true: rodent baits can be toxic to fish as well as to the mammals they are intended to kill. When considering biomagnification, it is advised to avoid eating top predators due to the accumulation of higher toxin levels. The responsible disposal of bait is also crucial to prevent ecological impacts from invasive species.
Step-by-step explanation:
The statement that rodent baits are not only toxic to most mammals that might eat the bait, but they are also toxic to fish is True. Rodent baits typically contain potent rodenticides that are designed to kill rodents, but these toxins can also affect other animals that consume the bait either directly or indirectly through the food chain. When dealing with the concern of biomagnification of toxins, one would want to avoid eating top predators, as these animals accumulate higher concentrations of toxins in their bodies due to consuming many other organisms that may also be exposed to these toxins.
Proper disposal of unused bait, as per guidelines, is crucial to prevent the inadvertent introduction and spread of non-native species and the associated ecological impacts. For example, releasing unused bait in or near water bodies can introduce invasive species which can have detrimental effects on the local ecosystem.