So you thought you had a snail problem?

[SirMinion]

I wonder what imbalance in the ecosystem caused this to begin with. You don't usually have random, out of control population growth unless something that used to regulate has been elminated from the environment...

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The snails are not native to Vietnam, they're South American so their natural population control predator is not there hence the population explosion.

Just like the cane toads in Australia that were introduced to eat sugarcane grubs.
They turned out to eat just about evey native Australian creature including several species of marsupial mouse but they won't eat the cane grubs.
Anything that tries to eat them dies from their venom.
The toads are now spreading across Australia wiping out the local fauna as they go by systematically eating or poisoning everything in their path.

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And in accordance with that, what about the nile perch? That's the cause of the number of species of cichlids found in lake victoria is now 100 and not 300...

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Sadly, the list goes on and on..

 

[Tokis-Phoenix]

Apparently parrot fish are becomming a major problem in many tropical rivers that hold fish like african cichlids, they were very popular at first but now the novelty has worn off the parrot fish and people have realised what unsuitable community tank fish they make, people started dumping them in rivers and now their numbers are out of control.

 

[Teelie]

It may take a while but nature has a way of stablizing itself no matter what gets thrown at it. Whether the changes are natural or manmade, they happen and they get dealt with. It's when people try to treat one problem by introducing another, then another to deal with it and so on that you really start making waves in the ecosystem which take longer to settle.