First, tilapia
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In fact, when defining whether a species is an invasive species, it is not defined by the delicious or cultured species, but by the harm to local organisms, and tilapia is such a fish! It has the following advantages:
1, short growth cycle
2. Miscellaneous eating habits pose a threat to other fish.
3. The breeding method is quite special: oral incubation, and there are no natural enemies in the egg stage.
In fact, don't think that tilapia is a kind of fish. There are more than 0/00 kinds of tilapia in the world. China first introduced Mozambican tilapia from Vietnam in 1956. This kind of fish is very similar to crucian carp, so it is called African crucian carp! The meat is tender and tastes good! Because the southern waters are more suitable for tilapia growth, it is difficult to see tilapia in the northern waters!
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Tilapia fillets, do they look appetizing? Actually, it tastes good, too
Braised tilapia
Second, Ampulla canaliculata
Everyone should be deeply impressed by this, the distribution area is wider than that of tilapia, and the eggs laid by Ampullaria gigas are very eye-catching, pink, and still dozens of centimeters above the water!
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These pink snail eggs look disgusting! At the beginning, it was introduced as feed, but as a result, it was flooded. Up to now, Pomacea canaliculata has occupied most of the waters in southern China, and it is still spreading!
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From the above picture, the spread of Ampullaria gigas is very fast, and it is estimated that it will not take long to occupy the whole country! Attention, everyone, snails can eat, but there are many parasites, so they must be cooked thoroughly when eating!
Third, trash fish
Is the scavenger, as an ornamental fish and fish to clean the river, but like most invasive species, did not achieve our good wishes, but eventually because of the super adaptability of species flooded!
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In fact, there are far more than one species of this kind of fish in the country of origin. The scientific name of the scavenger and trash fish we mentioned is Silurus asotus, also known as Silurus asotus! Of course, no matter what it is called, it has posed a great threat to the local fish in the invasion area, because it will eat the eggs of other fish, which is simply a kind of childless fish ...
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The meat quality of scavengers is related to their habits and tastes fishy, so most people don't like to eat this kind of fish! But it doesn't seem to be a particularly serious problem in the barbecue with heavy taste. There is a tradition of eating scavenger fish in Southeast Asia and India, so foodies might as well develop it.
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In fact, there are more than these species flooding in China, most of which are left over from history, such as the introduction of biological invasion in the early days for economic benefits, and the problem of random release, and the consequences of the recent flooding may take decades to show! But what should come will come, and the mistakes we made will be borne by future generations one day!