In this article, let's first look at snails living in still water. Among the numerous snail species, the most simple ones are the Chinese snail and the stone snail, which is closely related to the historical background of China's founding a country through agriculture. This snail likes to live in rice fields, ponds or lakes that are not polluted by pesticides. The right antenna of the male snail is specialized as penis, which is fertilized with the female snail in vivo. The largest species in Lianshui North, a native of Taiwan Province Province, originally belonged to the Chinese snail, but this title has been lost since it was introduced from Argentina. Pomacea canaliculata is a group of quite large water snails, and the shell height can reach 7 cm. It was originally introduced from South America in 1970-80. It was originally planted for eating, but it was abandoned because of its softness and poor taste. As a result, these exotic creatures proliferated and invaded rice fields and irrigation ditches in Taiwan Province Province, causing serious damage to crops. In Datunchi National Park, records show that the species introduced from Taiwan Province Province include Ampullaria gigas, Ampullaria gigas, Ampullaria gigas and so on.
In the records, the species introduced from Taiwan Province Province are Ampullaria gigas, Ampullaria gigas, Ampullaria gigas and so on. In addition to the larger species mentioned above, there are many smaller species such as Oncomelania hupensis and swamp snails, as well as millet snails that like to live on the banks of grass mud. In addition to these larger species, there are many smaller species, such as snails, swamp snails and millet snails, who like to live on the banks of grass mud. 1. In addition to these gill-bearing species in Gastropoda, there is also a spirochete that also inhabits ponds, ponds and other still waters, such as cone snails, cyst snails, and flat snails and snails that are occasionally brought into aquariums with aquatic plants. The snail's coat is specialized into lungs, so the cone snail, the cyst snail and the flat snail will inhale air and store it in the coat cavity, and even breathe when diving.
In addition to these branchial species in Gastropoda, there is also a spirochete that lives in still water and other habitats such as ponds and ponds, such as cone snails, cyst snails, and flat snails and snails that are occasionally brought into aquariums with aquatic plants. This kind of snail's mantle is specialized into lung, so cone snail, cyst snail and flat snail will inhale air and store it in the mantle cavity, which can be used for diving. Laishui Gastropoda is a creature that can be used as a biological indicator. The degree of water pollution can be understood by its distribution type and quantity, which is used to assist the index data established in aquatic insects.
Laishui Gastropoda is a creature that can be used as a biological indicator. Through its distribution type and quantity, we can know the degree of water pollution, which is used to assist the index data established in aquatic insects.
In fact, snails have different preferences for water pollution tolerance due to different species. Therefore, the survey of snail distribution can be used as the basis of biological indicators.
Take the still water creatures mentioned in this paper as an example. Most of them can tolerate the environment with high organic pollution, but in the environment with high pollution, only Ampullaria canaliculata can't survive, followed by Ampullaria canaliculata and Ampullaria canaliculata, while encapsulated snails and Ampullaria canaliculata can survive in dirtier water. But when the water is as empty as a ghost town, only Ampullaria canaliculata may still enjoy sunbathing leisurely, ignoring the fish carcasses floating in the water.
related data
Conch was replaced, which led to disease.
Guo, deputy director of the Municipal Health Supervision Office, reported the cause of the "Longevity Snail" incident in this city: after preliminary investigation by the Health Bureau, there were two problems in the raw material replacement and incomplete heating of the "cold snail meat" and "fragrant snail meat" sold in the romantic restaurant in Shuzhou before August 8, that is, the raw material of snail meat was changed from the original conch to fresh snail, which was only soaked in water with a shell, then frozen in the shell, and finally blanched in hot water.
Freshwater snails are included in the routine inspection.
The Municipal Health Bureau decided to include the sale of raw freshwater snails in restaurants in the daily food hygiene inspection items. Restaurants must pass health quarantine before they can process and eat snails. Once a restaurant is found selling raw or half-cooked freshwater snails, the health supervision department will order it to stop selling them immediately. In addition, the restaurant should also provide the source of freshwater snails to the health supervisor, and should have relevant registration. According to reports, more than 2,000 key catering units in Sichuan, Guangdong, Hunan and Hubei have carried out relevant inspections. Up to now, no restaurants have been found to sell raw and half-cooked freshwater snails.
Guo, deputy director of the Municipal Health Supervision Institute, said that the routine inspection of food hygiene refers to the main inspection items stipulated in the Food Safety Law, including the health certificate of food processors, the environment of processing places and disinfection facilities, including the heating of cooked food. Relevant regulations. Because Ampullaria gigas is a new type of food introduced to this city from the south, health supervisors rarely conducted special routine inspections on it before.
Guo also said that it is not feasible to control Angiostrongylus cantonensis from the source because it is impossible to check the snails entering Beijing from the south one by one. People can only be widely told not to eat freshwater snails, and at the same time, the supervision of markets and restaurants should be strengthened. According to its disclosure, the Municipal Health Supervision Office has begun to formulate relevant supervision and management measures for raw aquatic products.
It is not contagious from person to person.
Yin, Assistant Director of Institute of Tropical Medicine, Friendship Hospital. Dr. W Hong said that the freshwater snail Ampullaria gigas is one of the intermediate hosts of Angiostrongylus cantonensis, which can often be seen in the aquatic products market in this city. There is also a freshwater agate snail with greater risk of disease, which has not been seen in the market of this city. Conch is not the host of Angiostrongylus cantonensis. "Angiostrongylus cantonensis will be killed when freshwater snails are heated above 90 degrees Celsius," he stressed. In addition, according to the situation of receiving medical treatment, the treatment of intestinal Chongqing will have a unique effect, and it will not be transmitted from person to person, so this group incident of "Pomacea canaliculata" is relatively easy to control.
The Municipal Health Bureau reminds the public not to eat fresh or incompletely heated aquatic products such as snails, fish, shrimps and crabs to avoid being infected with food-borne parasitic diseases.