Who would have thought that after just a few years of hard work, other fish species in these waters gradually disappeared, and the Egyptian bearded catfish flooded, and finally it was necessary to use various measures to kill them. Why?
The Egyptian bearded catfish has amazing fertility. At the same time, the Egyptian bearded catfish shows amazing omnivorousness and predation, and kills other fish. The eggs and small fish of other fish will be eaten up by the Egyptian bearded catfish, and there is no basic condition for other fish to live.
After killing, people began to try artificial breeding, and achieved good economic benefits. The biggest advantage is that it has fast growth speed, strong hypoxia tolerance, and can be cultured in high density, and 50- 100 seedlings can be put in every square meter. Silurus meridionalis has an amazing food intake, which can reach 10- 15% of its body weight. The economic benefit of artificial breeding is considerable. When the daily feeding amount reaches 5%, it can grow rapidly.
Silurus aegypti, native to the Nile valley, is a tropical fish, which is suitable for fresh water culture. It begins to hibernate when the temperature drops to 10℃, and dies in large numbers when the temperature drops below 7℃. Therefore, in fact, the area where Silurus aegypti is cultivated is greatly affected.
In South China, such as Guangdong Province, after 3-5 cm catfish seedlings with Egyptian beard are put in May every year, they can grow to1.5-2 kg after about 2-3 months. After fishing, fry will be released again in August and harvested in time in1February. In Sichuan and central China, it can be released once a year, and it is generally raised in ponds, lotus vegetable fields, rice fields and reservoirs.
Catfish with Egyptian beard belongs to the bottom fish. In pond culture, the water depth is generally required to be1.5 ~ 2m, so it can be raised purely, or it can be put into catfish with Egyptian beard for mixed culture when the water temperature reaches 10℃.
Silurus aegypti is an omnivorous fish, which grows fastest when fed with carnivorous feed such as small fish and shrimp, and grows relatively slowly when fed only with plants, and it is generally appropriate to mix it with plant feed not exceeding 20%.
Silurus aegypti can also be raised in North China, East China and Northwest China, but it is only necessary to put fry when the temperature reaches 10℃ or above, and catch them as soon as possible when the temperature drops below 10℃ to avoid unnecessary economic losses.
Friendly reminder:
There are essential differences between the Egyptian bearded catfish and the local catfish. The local bearded catfish has a small body and a long lower lip, which generally does not exceed 500 grams. The Egyptian bearded catfish is a large fish, which grows very rapidly, with eight beards and the upper lip covering the lower lip.