Misuderstood Mutations

Evolution has answered - a sea-dwelling wish
After thousands of years: the net-cutting fish

The net-cutting fish, with scissors as lips
Will swim through the sea, the bane of all ships
Attempting to haul, and lift up a catch
The net-cutting fish, the fishermen wretch

The net-cutting fish, a friend to the swimmers
Will cut through all nets - with his marvelous trimmers
The coast towns will starve, the fish will survive
And of course, conversely - the farmers will thrive

As nature is kind, so is nature vicious
For these net-cutting fishes; they'll taste quite delicious
And predators come - from near and from far
To eat up these fish, though they leave quite a scar

The fishermen cheer, their children will sing
For the net-cutting fish - was a short-lived thing
And though the fish laughed, and fishermen hissed
History will forget - the net-cutting fish