Which two species are prohibited for use as biological control agents in Michigan?

The use of tilapia and grass carp as biological control agents is prohibited in Michigan due to their potential negative impacts on native ecosystems.

Tilapia are known to reproduce quickly and can outcompete native fish species for resources, leading to a decline in biodiversity. They also have the ability to thrive in various aquatic environments, which can further escalate their population and impact on local ecosystems.

Grass carp, although sometimes used for aquatic vegetation control, are heavily regulated because they can also reproduce in natural bodies of water, posing a significant threat to aquatic plants and ecosystems. Their feeding habits can lead to the destruction of native aquatic plant communities, which provide habitat and food for other wildlife.

Prohibiting these species ensures the protection of Michigan’s aquatic ecosystems from potential harm that can arise from introducing or utilizing these species as biological control agents. In contrast, the other options do not carry the same level of ecological risk associated with their use in aquatic pest control within the state.