Among non-native marine (and invasive) species, the blue crab is undoubtedly the star of the last two years. But he is not the only malefactor in the waters and lagoons of the Lion Bay. Observe the carnivorous comb Mnemiopsis Leidyi or crepidula. Other “works” appear and reproduce. This applies to frogs and rabbit fish or monstrous lice that eat the tongue. We introduce you …
Not a day goes by without mentioning the invasive and destructive presence of blue crab in the lagoon. Callinectes Sapidus has been at the forefront for several months and has been the subject of research and studies aimed at its eradication, if possible, or commercial promotion, its taste is, in fact, undeniable.
Blue crab in the pond of Canet-en-Roussillon: 400,000 euros to combat its overpopulation
We would almost forget about the presence of other non-native marine species, which are also harmful and can cause chaos if reduced. The CPU (Permanent Center for Environmental Initiatives) of the Tau Basin has been leading the Guardian Seas network in Occitania for several years, with the aim of gathering observations from citizens. He is now creating the Alien Occitanie system, “Network to improve knowledge of non-native marine species through citizen monitoring”.
For example, partner ports invite volunteer boats to take samples from boat hulls. An information campaign for boatmen is underway in parallel with the training of Ecogestes ambassadors. Finally, information and media tools are widespread. In addition, online resources are available, such as a guide to species, or sites and programs that list observations (or exchange them).
ALIEN Occitanie, a network for the detection of marine species from other countries
Terrible tongue lice
Each, in turn, enzyme (non-native marine species) comes to the fore in terms of speed of their appearance, seasons, their distribution. In recent weeks, when a large number of fishermen have returned to the beach, it is a louse that eats the tongue Cerathotoa italica causing noise. According to blogger Jeremy Chloe, administrator of Surfcasting Méditerranée on Facebook (more than 4,500 members), the parasite is becoming more common. Including himself.
The existence of this parasite is worthy of a horror movie. It remotely resembles a maggot and has claws. He penetrates the fish through the gills, and then clings to her tongue. Hematophagus, feeds on blood. It is on the tongue that it feeds on animals of its favorite species – sea bream, sea bream, sea bream, and sometimes page. Once he devours his tongue, he eventually replaces it! According to what Jeremy Chloe was able to observe, “When several of them settle in the mouths of fish, one finds a large one instead of a tongue, and a few small ones in the back of the throat or attached to the gills”.
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No risk to human health
According to the site of scientific data Doris (Observational data for the recognition and identification of underwater fauna and flora), This intraoral endoparasite does not pose a risk to humans when consuming host fish. It slows down the growth of host fish and limits their reproduction, development and life expectancy. Researchers have found that Betty thrives in areas overexploited by fisheries. , near Spain, only 30% of fish are infected, while in areas of intensive fishing, such as Italy, the death rate (prevalence of the parasite) reaches 47%. Ceratothoa, including 8 in the Mediterranean. Ugh According to Jeremy Chloe, fish have excess mucus in their mouths. Only one rinse is needed to remove it.
Mediterranean: Warning of Caulerpa Algae Invasion!
Frog fish, rabbit fish, the same battle
The other two Enims in the news in recent months are the frogfish and the rabbitfish, which, in addition to being great eaters, are sometimes cannibals, poisonous, poisonous, or even both (hence it is useful to learn to recognize them). As for the first, a fishing cooperative in the Lion’s Bay, Satoan, warned professionals in a publication last fall. “Lagocephalus sceleratus is a species that originated in the Red Sea and was brought to the Mediterranean via the Suez Canal. This fish is considered one of the most harmful species in the Mediterranean due to its power. neurotoxin, its impact on marine biodiversity, and the increased costs and labor it causes to fishermen. Catching and consuming this fugu fish is prohibited in almost all countries bordering the Mediterranean. Now this fish is distributed throughout the Mediterranean and the Black Sea. “.
Rabbit fish, also from the Red Sea, are under surveillance. It is a herbivorous animal, like the saupe (known as hallucinogenic if not emptied as soon as it is caught), which we know well on our coast. However, the rabbit would be a real disaster if it colonized our coasts, because it is able to devour algae forests with the consequences we have for biodiversity.
In general, maritime transport, water warming, new trends, etc. have not stopped occupying scientists and worrying fishermen and environmentalists.