Tilapia was first introduced to Taiwan Province in 1946 by Wu Zhenhui and Guo Qiyan from Singapore, and in honor of these two people, it was first called "Wu Guo Fish". In 1957, it was introduced from Vietnam to the mainland of China, also known as "Vietnamese fish". Because it is native to Africa and resembles the native crucian carp, some people call it "African crucian carp".
There are two kinds of tilapia introduced into Yingshan Hot Spring in Hubei Province: one is Mozambique tilapia, which was brought to Yingshan Hot Spring from Jingshan County in 1972;The other is called Nile tilapia, which was introduced by the Hubei Provincial Fisheries Research Institute in 1979. After they settled down, they all lived well.
Tilapia has the characteristics of miscellaneous diet, low oxygen tolerance, low temperature resistance, and strong reproduction
1 Miscellaneous food: Tilapia is an omnivorous fish based on plants. Most of the digestive tract contents of tilapia in ponds are organic detritus and other plant-based feeds (such as aquatic weeds, commercial feed, etc.), followed by phytoplankton, zooplankton and a small amount of benthic animals.
2 Hypoxia tolerance: Tilapia has a strong ability to tolerate hypoxia, and the suffocation point is 007 Tilapia 023 mg liters, 1 dissolved oxygen in waterAt 6 milligrams, tilapia can still live and reproduce. When dissolved oxygen in water is more than 3 mg liters, growth is not affected.
3 Not tolerant to low and high temperatures: The survival temperature range of tilapia is 15 35. When the water temperature is below 15, tilapia is dormant. The maximum critical temperature of tilapia is about 40 41, the most suitable growth temperature is 28 32, and the reproductive temperature of tilapia is above 20.
4. Strong reproduction: tilapia has early sexual maturity, short spawning cycle, oral incubation of juveniles, low requirements for reproduction, and natural reproduction in a large water area in a still water body. Tilapia reaches sexual maturity in 6 months, the female fish weighing about 200 grams, the amount of eggs is more than 1000 1500 grains, during the breeding period, the male fish has a beautiful wedding smoke color, the abdomen has ** and the genitourinary orifice two mouths, the abdomen has a white ** outflow, the female has 3 holes in the abdomen, namely, **, the genital pore and the urinary pores. Water temperature 18 32, mature male fish has the ability to "dig the nest", mature female into the nest pairing, produce mature eggs and immediately contain them in the mouth, so that the eggs are fertilized, the fertilized eggs develop in the female mouth, the water temperature 25 30 hours 4 5 days can hatch juveniles. Juveniles leave their mothers when the yolk sac disappears and has some capacity.
As one of the most successful alien species in China, tilapia quickly gained a foothold in China and made China a major country in tilapia farming in one fell swoop. However, tilapia is not well received by the Chinese people, and when it is caught by anglers, it is either released or fed to poultry. Why is tilapia not treated well by the Chinese people?
On the one hand, the taste and meat quality of tilapia may not be the favorite of Chinese people. The meat of tilapia is hard and the taste is fishy, which is somewhat different from the tender taste that Chinese people like.
On the other hand, some people may have doubts about the ** and quality of tilapia. In some places, tilapia may be farmed in heavily polluted waters, resulting in harmful substances in their bodies. As a result, some people may be concerned about the adverse health effects of consuming tilapia.
In addition, the nutritional value of tilapia is not high compared to other fish. Although tilapia is rich in protein and calcium, it is high in fat and calories, making it unsuitable for people who need to control their diet.
Factors such as the taste, quality and nutritional value of tilapia may be the reason why Chinese people do not like to eat tilapia.