I don’t know when it started, but the fish faces in Zhujiang are becoming more and more unfamiliar, and it feels like they are coming from another dimension.
This makes people ask: Where have the local fish in the Pearl River gone?
Scenery of the Pearl River
In fact, the local fish in the Pearl River have always been there, but these alien species have squeezed the living space, and their number is getting smaller and smaller.
So, what is the situation of the invasion of the Pearl River?
Under the calm river, a competition for fish is surging undercurrents.
Undercurrents under the calm Pearl River
Pearl River Sorrow
The Pearl River's presence in our country is not as high as Yangtze River and Yellow River . After all, these two rivers are the "mother river" in our culture.
In fact, Pearl River is the "mother river" of in South my country, and its flow ranks second in the country. If looks at according to length and flow, the Pearl River is the river with the most turbulent water flow.
This is mainly because it flows through the region with the most rainfall in my country , which makes it in a relatively abundant state all year round.
In the past, food and drink in Guangdong and Guangxi were all tied to the Zhujiang River . The population here is large, and soon the number of fish in the Zhujiang River is in a hurry.
Pearl River
In order to solve the problem of eating fish, my country began to introduce some fish in the 1980s, including tilapia , wheat grass, leather beard catfish and other relatively high-yield fish.
These fish have one characteristic: is very capable, has strong adaptability, and is delicious when eating. They are tropical fish from Africa or India. The temperature in the Pearl River Basin is 14 to 22℃ all year round. It is more friendly to these fish. If you let them go to the Yangtze River, some may freeze to death in winter.
These fish came to the Pearl River, and was like a mouse falling into the rice jar , because the Pearl River did not have their natural enemies, but there were still many delicious foods.
Among them, tilapia is the most powerful, and it almost squeezed all the four big fishes .
The leather-bearded catfish
tilapia was native to African , also known as African crucian carp . In fact, it has a very far-reaching relationship with crucian carp . It belongs to cichlid family , while crucian carp belongs to cichlid family . The biggest difference between it and local fish is that if you see a fish with fins on its back, it is mostly tilapia.
In addition, the tail of tilapia is fan-shaped , and it also has a little red color. The tail of the local fish in my country is forked.
The taste of tilapia is actually very delicious. has more meat and less prickly . It has the reputation of "white meat salmon" . It was very popular among the people of Guangdong and Guangxi at the beginning. Dishes such as braised tilapia, steamed tilapia, and boiled tilapia are very popular in the market.
Tilapia
However, as tilapia escaped from the farm and entered the Pearl River, it became an invading fish that everyone shouted and beat.
Because in front of local fish, tilapia is a very fierce character . During the breeding season, male tilapia will build nests and then undergo in vitro fertilization with female fish.
If it is an ordinary fish, it will be done. Then let the offspring die by themselves. However, tilapia do not. female will hold the eggs in her mouth until the fry is hatched .
Pearl River is full of tilapia
. This care leads to the survival rate of tilapia offspring directly crushing other fish . The female fish during the hatching period does not eat or drink, and when the child hatches, it will open the verb of eating.
tilapia is an omnivorous food and eats everything. Hungry female tilapia will eat the eggs of other fish to supplement nutrition.
In this way, tilapia relies on its strong fertility to make the fish in the entire Pearl River surrender under its fins.
In addition to tilapia, there is also a kind of ornamental fish that has also brought ecological disaster to the Pearl River, that is scavenger .
Scavenger
This guy has a reputation that is more stinky than tilapia, because tilapia can still be eaten at least, this guy is ugly and terrible .
Scavenger, its real name is leopard-print fat-body cat , it is a kind of scavenging fish . It is a younger brother of fish in my hometown South America, and specializes in picking up leftovers .
Business people value leopard-print fat-body catfish's ability to eat moss and feces , package them into a kind of clean fish, and named it Scavenger. After the introduction of
in my country, the aquarium bundled it with other fish to sell it. It is said that it can clean the moss on the surface of the fish tank, the crazy-growing algae , etc.
After the buyer took it home, he found that this product was not only unclean, but also ate other fish. Often, was kept until the end of the bathtub, only scavengers were left in .
looks like a scavenger
Because it did not meet expectations, many people discarded scavengers , which led to them entering the Pearl River.
Scavengers don’t have to be a younger brother to eat garbage in the Pearl River, but eat the local fish and their eggs in the Pearl River.
Lipapia and scavenger alone are enough to drink a pot of local fish. The key is that there are also a number of invasive species such as wheat turtle, tai turtle, and leather-bearded catfish.
The Pearl River has changed from the "mother river" in South China to the "invasive species battle" . Under the originally calm river, it has become a mess.
So can these intrusion problems not be solved? Is it not possible to eat it?
One of the invasive species, wheat graze
foodies can't help
This time, foodies can't do anything about it, because tilapia and wheat graze are the that are introduced to eat. The problem is that humans cannot eat at all, and the reproduction speed of these fish in the Pearl River .
Fish in wild environments have a strong earthy smell, and their taste is not as good as those grown, so people dislike this type of fish.
plus Pearl River has been seriously polluted in the past period of time. These wild fish have already carried harmful substances such as heavy metal ions and . It is best not to eat them.
What's more, fish like Scavenger are not delicious even if raised by humans. The meat in the whole body is probably less than two taels, and the whole body is full of bones.
Braised tilapia
Someone mentioned that can one thing be reduced to one thing, bring in the natural enemies of these fish, let them kill each other, and humans can reap the benefits of fishermen.
This method is absolutely indispensable, because the natural enemies introduced by are also an alien species . How can we ensure that the natural enemies will eat these fish when they come to the Pearl River? What if it prefers to eat local fish?
Australian fox is a bloody example . Originally, Australians were just thinking about letting the fox catch rabbits, but after the fox came, they killed the local small marsupials.
The red fox that invaded Australia
In the end, the rabbit was not caught, and even exterminated some of its marsupials .
Originally, the Pearl River was already messy enough, and it was even more messy to add these carnivorous fish. Take the scavenger as an example. Its natural enemies are Caman , Otter , piranha , etc. Can we introduce them? I don’t have any raising a Gu Gu like this!
Or, just use the most primitive method to cast a net to catch fish, pick out the invading fish, and put the local fish back to the Pearl River.
Otter gnaws scavenger
This method takes time, effort and money, and will also cause a large number of fish to die in the process . Moreover, the Pearl River is 2,320 kilometers long. When will it take to catch?
Obviously, this method doesn't work either. invasive species is a very serious problem. . It is difficult because it is too large in distribution. Crayfish, which is used as food, is a special case of invasive species.
fishing net fishing
invasion problem stumped the world
Every country in the world has a certain degree of biological invasion . The most serious ones are Australia, New Zealand , which have been isolated from other continents for tens of millions of years.
Australia is simply an interprets the best sample of biological invasion . Any mammal that is not long in parenting bag seen in Australia is an alien species, including humans.
Only two of these mammals came from the early days, one was human, who landed in Australia about 40,000 years ago, and the other was Australian wild dog , which was brought to Australia about 9,000 to 5,000 years ago.
Australian wild dog
The remaining non-marsupial mammals are all
As long as these animals can come, can flood without exception, especially super-powered animals like rabbits. At the most, Australia has more than 10 billion rabbits, which is more than people all over the world.
In addition to Australia, another invasive species in is more serious. There is also the United States . The situation in North America is similar to that in Australia. They are both too far away from the three continents of Asia, Africa and Europe. The animals brought from here are prone to flooding.
Rabbits in Australia
But fortunately, North America is not isolated from the world . It has Bering Strait and the Eurasian continent , so its ability to withstand invasive animals is a little stronger than Australia.
But this is not of use at all. The main flooding of fish in North America is fish. In order to control the algae in the river, they introduced many japonica fishes from Asia. As a result, they flooded their "mother river" Mississippi River . This is the Asian carp that frequently appears in hot news.
Asian carp in the United States
The number of invasive species in my country exceeds 660, most of which are plants and insects. Unfortunately, everyone remembers "The Shame of Invading Animals" crayfish .
Scavenger
This guy has a reputation that is more stinky than tilapia, because tilapia can still be eaten at least, this guy is ugly and terrible .
Scavenger, its real name is leopard-print fat-body cat , it is a kind of scavenging fish . It is a younger brother of fish in my hometown South America, and specializes in picking up leftovers .
Business people value leopard-print fat-body catfish's ability to eat moss and feces , package them into a kind of clean fish, and named it Scavenger. After the introduction of
in my country, the aquarium bundled it with other fish to sell it. It is said that it can clean the moss on the surface of the fish tank, the crazy-growing algae , etc.
After the buyer took it home, he found that this product was not only unclean, but also ate other fish. Often, was kept until the end of the bathtub, only scavengers were left in .
looks like a scavenger
Because it did not meet expectations, many people discarded scavengers , which led to them entering the Pearl River.
Scavengers don’t have to be a younger brother to eat garbage in the Pearl River, but eat the local fish and their eggs in the Pearl River.
Lipapia and scavenger alone are enough to drink a pot of local fish. The key is that there are also a number of invasive species such as wheat turtle, tai turtle, and leather-bearded catfish.
The Pearl River has changed from the "mother river" in South China to the "invasive species battle" . Under the originally calm river, it has become a mess.
So can these intrusion problems not be solved? Is it not possible to eat it?
One of the invasive species, wheat graze
foodies can't help
This time, foodies can't do anything about it, because tilapia and wheat graze are the that are introduced to eat. The problem is that humans cannot eat at all, and the reproduction speed of these fish in the Pearl River .
Fish in wild environments have a strong earthy smell, and their taste is not as good as those grown, so people dislike this type of fish.
plus Pearl River has been seriously polluted in the past period of time. These wild fish have already carried harmful substances such as heavy metal ions and . It is best not to eat them.
What's more, fish like Scavenger are not delicious even if raised by humans. The meat in the whole body is probably less than two taels, and the whole body is full of bones.
Braised tilapia
Someone mentioned that can one thing be reduced to one thing, bring in the natural enemies of these fish, let them kill each other, and humans can reap the benefits of fishermen.
This method is absolutely indispensable, because the natural enemies introduced by are also an alien species . How can we ensure that the natural enemies will eat these fish when they come to the Pearl River? What if it prefers to eat local fish?
Australian fox is a bloody example . Originally, Australians were just thinking about letting the fox catch rabbits, but after the fox came, they killed the local small marsupials.
The red fox that invaded Australia
In the end, the rabbit was not caught, and even exterminated some of its marsupials .
Originally, the Pearl River was already messy enough, and it was even more messy to add these carnivorous fish. Take the scavenger as an example. Its natural enemies are Caman , Otter , piranha , etc. Can we introduce them? I don’t have any raising a Gu Gu like this!
Or, just use the most primitive method to cast a net to catch fish, pick out the invading fish, and put the local fish back to the Pearl River.
Otter gnaws scavenger
This method takes time, effort and money, and will also cause a large number of fish to die in the process . Moreover, the Pearl River is 2,320 kilometers long. When will it take to catch?
Obviously, this method doesn't work either. invasive species is a very serious problem. . It is difficult because it is too large in distribution. Crayfish, which is used as food, is a special case of invasive species.
fishing net fishing
invasion problem stumped the world
Every country in the world has a certain degree of biological invasion . The most serious ones are Australia, New Zealand , which have been isolated from other continents for tens of millions of years.
Australia is simply an interprets the best sample of biological invasion . Any mammal that is not long in parenting bag seen in Australia is an alien species, including humans.
Only two of these mammals came from the early days, one was human, who landed in Australia about 40,000 years ago, and the other was Australian wild dog , which was brought to Australia about 9,000 to 5,000 years ago.
Australian wild dog
The remaining non-marsupial mammals are all
As long as these animals can come, can flood without exception, especially super-powered animals like rabbits. At the most, Australia has more than 10 billion rabbits, which is more than people all over the world.
In addition to Australia, another invasive species in is more serious. There is also the United States . The situation in North America is similar to that in Australia. They are both too far away from the three continents of Asia, Africa and Europe. The animals brought from here are prone to flooding.
Rabbits in Australia
But fortunately, North America is not isolated from the world . It has Bering Strait and the Eurasian continent , so its ability to withstand invasive animals is a little stronger than Australia.
But this is not of use at all. The main flooding of fish in North America is fish. In order to control the algae in the river, they introduced many japonica fishes from Asia. As a result, they flooded their "mother river" Mississippi River . This is the Asian carp that frequently appears in hot news.
Asian carp in the United States
The number of invasive species in my country exceeds 660, most of which are plants and insects. Unfortunately, everyone remembers "The Shame of Invading Animals" crayfish .
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