noun, plural (especially collectively) ar·cher·fish, (especially referring to two or more kinds or species) ar·cher·fish·es. any of several closely related fishes of the family Toxotidae. ...

What is the meaning of archerfish?

: any of several small chiefly Asian bony fishes (genus Toxotes and especially T. ejaculator of the family Toxotidae) that catch insects by stunning them with water ejected from their mouths.

Why does an archerfish need to be still?

While archer fish mouths go above the surface to shoot down prey, the rest of the body remains submerged. Their eyesight does not account for refraction of light against the water, so they must learn to aim for accuracy.