Mosquito fish - Gambusia affins are small, easy to care for fish that feast on mosquito larvae.
Have a pond? A rain barrel? Pond in a pot? Then these fish are a MUST HAVE. 
They’re the hardiest fish you’ve ever kept surviving in the poorest of water conditions with temperatures between 32°f (short periods of time) and 104°f! Mature fish are between 1.5”-3” long. 
Best part is you never have to feed them! They’re ferocious for mosquito larvae and aquatic insects.