Shooter Fish

They are carnivorous fish that inhabit large rivers and lakes.
They are about 1,3 m long, weight about 36 kg, and have 2 cm long razor-sharp teeth.
However, their teeth won't kill you. Most probably, their spit will. They evolved the capacity to throw stones at an extremely high velocity in the air, projected by an incredibly powerful jet of water. This attack is capable of puncturing skin, fur and chitin alike, much like an arrow, or an ancient bullet would.
This makes as much damage as longbow, and the attack is treated as Spitting, with a 15 m range.
Their usual prey are insects that approach water bodies to lay eggs, however, people on small boats are percieved as a delicacy. Drinking animals are sometimes shot if they are dumb enough to get into the water. Since they cannot jump out of the water, they won't shoot targets that won't fall into deep enough water, where they can venture.
Thankfully, they are antisocial creatures, and won't swarm you.
They will attack small fish, crayfish, and crabs, and won't attack healthy large creatures that are already swimming in the water.