"Invasion" failed in China and was eaten in large quantities. Why is it forbidden to release, with a maximum fine of tens of thousands?

In recent years, we have heard of "species invasion" in other countries wherever we go, which leads us to eat in China. It's gnawing teeth.
Little wonder, our country has also experienced the invasion of species, just because the taste is too delicious, so you know.
Almost become the protection of animals do not say, but now released will be fined, up to tens of thousands of money, so what?
Some new species have been brought into the new countries. Since there are not many natural enemies in the country, the number of new species is bound to soar.
Look at Australia's overflowing hares, you know, these hares in Australia and other countries, overflowing, not to mention, but also everywhere to dig holes, making a special number of grassland holes, really troublesome.
China has also been invaded by a species, that is bullfrog. Imagine how delicious the bullfrog is.
No, bullfrog is such an abominable animal. When bullfrog first came to China, it did bring great benefits to eliminate some harmful effects. But bullfrog also eats some tadpoles, which caused a bad phenomenon.
And ah, bullfrogs had no natural enemies at that time, which led to a particularly rapid increase in the number of bullfrogs, almost disastrous.
Fortunately, Chinese eaters protected tadpoles. When we found that bullfrogs tasted so delicious, we went on a crazy hunt and finally saved tadpoles.
Now eat bullfrogs, they can only rely on artificial breeding, but also can not be released oh, otherwise they will be fined, up to tens of thousands of dollars.