Which of these is NOT an example of an Aquatic Nuisance Animal?

The water hyacinth is not classified as an aquatic nuisance animal because it is a plant rather than an animal. While it is considered an invasive species and can cause significant ecological problems in freshwater systems, it does not fall under the category of animals.

In contrast, the spiny water flea, carp, and zebra mussel are all examples of aquatic nuisance animals. The spiny water flea is a small crustacean that can disrupt local ecosystems by competing with native species for food. Carp, especially the Asian carp, can outcompete native fish for resources, altering the community structure of aquatic ecosystems. Zebra mussels are a highly invasive bivalve that can clog water intake systems and outcompete native mollusks for food. Each of these creatures contributes to ecological imbalance in various waterways, which is characteristic of aquatic nuisance animals.

Water hyacinth may also disrupt ecosystems, but its classification as a plant distinguishes it from the animal examples in the other choices.