Not a killing... just a few comments:
Did you know that a monster is invading the Mighty Mississippi River? And, with no known predators, the Asian Carp pose a danger to all who love boating on the river. Both, water skiers and boaters have been injured by this alien fish who often leap 10 feet into the air when startled.
A couple of things right away - 'monsters' in the title, and 'monster' in the opening sentence. It's rather melodramatic for a fish that can jump 10 feet into the air if that's the only hazard it presents. I was expecting a piranha-like thirst for flesh at the very least.
Asian carp can grow to be 5 feet long and weigh 150 pounds. As a tiny minnow, this species was accidentally released into the river. This needs corroborating - when, how and why? Where they began to multiply and spread. sentence fragment that doesn't make sense Now these huge monsters are gobbling up the habitats A physical impossibility of our native fish and eating their offspring too.
Scientists have spent ten years looking for a magic bio-bullet that will kill the invader and not harm other fish. But, for now it seems they are fighting a losing battle. As the Asian Carp multiplies and swims ever northward. Another sentence fragment - we're waiting to be told what happens next.
This monster same criticism as before is swimming up the Mississippi moving towards the Great Lakes. Once it reaches the Great Lakes repetition scientists fear this monster !!! will be unstoppable. Because a single female of this species will lay a million eggs in her lifetime. another sentence fragment - again because of this, what happens next? This alone virtually assures their species survives.
Lets all hope that scientists find(s) that magical bio-bullet before it is too late!
You've got some useful raw material here but I think it's too heavy on the sensationalism and too lightweight on the facts. I accept that this piece is aimed at younger readers and you're trying to capture their attention but you need to paint a much more evocative picture of the damage they do. What would happen, for example, if other species of fish were wiped out by this predator? It seemed a little toothless when it came to the threat they pose.
H3K