You drop a line expecting bluegill — instead, a fire-colored exotic cichlid explodes from the bank and nearly yanks the rod. Soon the water is boiling with giant invasives, each one bigger and meaner ...

It starts simple: drop a trap into a shallow, sketchy creek and hope something swims in. But as you watch from above, dozens of exotic cichlids swarm the bread like piranha, pushing each other aside ...

While a dominant male fish from northern Mexico mates with a female, a small fella bides his time in the offing. Suddenly, the little guy darts in ahead of Mr. Big and plants his seeds on freshly laid ...