A reader spoils all the fun:
As this article from the NYT three years ago shows, those carp are neither a joke nor to be taken lightly. Those kids in that boat could have been seriously injured (cf. broken jaw experience in the Times article).
From the article:
Though awesome and even unnerving to behold, the fishy fusillade is all too common on the Illinois River — and it is not good. These are Asian carp, a ravenous, rapidly multiplying invasive species that in the last decade has threatened the well-being of native fish, affected commercial fishing and transformed the typical workday for these researchers into a scene from “Apocalypse Now.”
The Dish 