And asking a first-grader to do a full-on research project on something as unusual as the stickleback fish was a bit much.
It first infects invertebrates called copepods, which it causes to swim around more, making them easier prey for stickleback fish.
The stickleback is a bottom-dweller and has no need for an air bladder.
Another interesting adaptation is the stickleback courtship behavior.
These large trout attain their size by preying on smelt, stickleback, and dace along with numerous bugs and insects.
British Dictionary definitions for stickleback
any small teleost fish of the family Gasterosteidae, such as Gasterosteus aculeatus (three-spined stickleback) of rivers and coastal regions and G. pungitius (ten-spined stickleback) confined to rivers. They have a series of spines along the back and occur in cold and temperate northern regions
C15: from Old English stickel prick, sting + back1