Introduction: Speaking of "invasive fish", the first reaction in the minds of most friends should be tilapia and scavengers, many waters in the south of the mainland have now been invaded by these two kinds of fish, and the original number of fish is getting smaller and smaller, and even extinct. Recently, some anglers caught a new type of "invasive fish" while fishing in Shengzhong Lake, Sichuan, from the video footage we can see that the "invasion fish" caught by the angler is actually a sunfish, and the adaptability of the sunfish is stronger than that of tilapia, so will the sunfish flood?
Sichuan anglers caught fat and strong sunfish
According to the video uploaded to the Internet by netizens, the angler is fishing in Sichuan Shengzhong Lake in the middle of April, Shengzhong Lake is located in An artificial lake in Sichuan, the widest part of the lake is more than 3800 meters, the deepest part is more than 170 meters, the lake area is 56 square kilometers, the reservoir capacity is 1.39 billion cubic meters, belongs to the national 4A level tourist attractions, the local average annual temperature is 16.4 °C, warm in winter and cool in summer, so the fish resources in the lake are very rich, like carp, grass carp, cockfish, crucian carp common in the freshwater waters of the mainland, There are many sunfish and so on, plus there is no ban on fishing in the local area, so there are many anglers who go fishing.
This time the fish caught by the fishing friend is the sunfish, according to the angler introduction of the number of sunfish in the Bell Lake is very large, see the bait on the crazy scramble, the most catchy time can catch an average of two minutes, it took half an hour to catch more than 30, the sunfish caught are basically one or two to two two look, it looks fat and strong.
How did the sunfish enter the mainland as an "invasive fish"?
The sunfish, like tilapia and scavengers, belong to the "invasive fish", and its invasion channels, like the tilapia, are actively introduced by the mainland. Sunfish originated from the north of Mexico and the south of the United States, the body surface is very beautiful with metallic luster of blue light, so in some places will be the sunfish as ornamental fish to breed, and the mainland introduction of sunfish because of its tender flesh, the earliest began to breed sunfish is the mainland of Beijing, Hunan and Hubei three places, sunfish just introduced to the mainland when it belongs to the hotel's high-end fish fresh, many farmers and hotels rely on it to make a small fortune.
In order to meet the domestic consumer demand for sunfish, scientists went to Japan to investigate and learn the breeding technology of sunfish, while fast research and development speed, and in 1999 conquered the artificial breeding technology of sunfish. Since then, sunfish have taken root in the mainland. With the increasing amount of aquaculture, more and more sunfish are fleeing, and sunfish are also found in wild waters in many places.
How scary are sunfish?
Maybe the sunfish are not familiar to everyone, but the tilapia must be very familiar, and the wild waters in many southern parts of the mainland have been occupied by tilapia, and the sunfish have a stronger adaptability than tilapia.
An adult female sunfish can lay 65,000 eggs at a time, and adult fish have the nature of protecting fish, so the survival rate of juvenile fish is very high. Juvenile fish can be foraged after 48 hours after hatching, 3 cm can swallow red worms, water earthworms, 5 cm can eat small fish, small shrimp, sunfish eating habits are very mixed, will rob the food of native fish species, more importantly, sunfish will also swallow fish eggs, resulting in less and less number of other fish.
Sunfish are much more adaptable to temperature than tilapia, and when the water temperature is below 10 ° C, tilapia may be frozen to death, so tilapia is only in the southern part of the continent, and the wild waters in the north will not appear. The sunfish can live normally in the water temperature of 1-38 ° C, and its ability to adapt to low temperatures is still increasing, which means that it can not only live in the south, but also grow well in the north.
Will sunfish flood?
At present, the sunfish in some places have been flooded, and Sichuan is the hardest hit area of the invasion, in addition to Shengzhong Lake, since other lakes, including Bailong Lake, Sancha Lake, Luban Reservoir, Tingzikou, etc. have already been the figure of sunfish, some anglers also said that some local lakes have been occupied by sunfish. It's just that the sunfish still have good economic value, so it has not yet flooded, if it is not controlled and allowed to develop like this, then the sunfish flood may be sooner or later.
Thinking brought by the sunfish: Some exotic species on the mainland were introduced back to China as economic species at the beginning of their introduction, but the lack of corresponding management only brought good economic benefits in a short period of time, and with the increase in quantity, the price will be left out after a sharp drop, and some farmed species will be released into the wild, and the lack of natural enemies will soon flood. Therefore, we must be cautious when introducing alien species, and there must be a supporting management plan after introduction.