killifish
/ˈkɪlɪˌfɪʃ/
noun
- A small, often brightly colored fish found in fresh and brackish waters around the world, popular in aquariums and used in scientific research.
- We caught a tiny killifish in the creek with a small net.
- Scientists study killifish because they can survive in very different water conditions.
- The killifish in our aquarium has beautiful blue and orange stripes.