The creek fish is a small aquatic fish that usually lives in streams, rivers or lakes. They are small, usually only a few centimeters long, and are sometimes called "little river shrimps." The small river fish is named for its slender body and agile swimming. Cats are domestic animals that are often regarded as companions to humans. They are light and agile and display a strong instinct when catching prey. These characteristics make cats somewhat similar to small river fish, so some people call small river fish "cats".
However, small river fish are not a type of cat, they are two different species. The river fish belongs to the fish category and is an aquatic animal, while the cat belongs to the mammal category and is a terrestrial animal.