Under normal conditions, almost all shellfish that inhabit the seas and oceans, are edible. However, in some cases, some of them are dangerous to humans. This strange transformation — the result of a bacterial infection or shellfish due to the fact that eating toxic dinoflagellates, they become toxic properties.
These mollusks are cockles (Cardium edule), donaks (Donax ser-ra), spizula (Spisula solidissima), blue shell (Schizothaerus nuttalli), Mia (Mya arenaria), the California mussel (Myti-lus californianus), the edible mussel (Mu -tilus edulis), volsella (Volsella modiolus) and dr.Otravlenie clams can flow through the gastro-intestinal type — with nausea, vomiting, diarrhea, stomach cramps, occurring in 10 — 12 hours after a meal, for allergic type — with redness and swelling of the skin, minor skin rash, itching, headache, swelling of the tongue. The most severe form is a paralytic. It is characterized by the appearance of burning and itching lips, tongue, gums. They are joined by dizziness, joint pain, impaired swallowing, drooling. Often develop paralysis of the muscles. In severe cases of poisoning death of the victim end.
When collecting shellfish and crustaceans in shallow tropical coasts inadvertently attract the attention of large, brightly colored shells that hide their fearsome inhabitants — toxic shellfish cone. They are representatives of the many (over 1,500 species) of the family Conidae. Dimensions of shells ranging from 6 to 230 mm, color of their varied and intricate, but they all have a distinctive conical shape. The most dangerous are the geographic cone (C.geographus), whose large beautiful shell-be-cream formula stains decorated brown spots and stripes; C.magus with small whitish mottled shells; C.ster-cusmuscarum, whose whitish shell strewn with black dots; C.catus, which has a black shell with white spots, brown and blue C.monachus.
Among the highly toxic relates C.tulipa. His small, twisted the cone shell, blue, pink or reddish-brown, covered with white and brown dots and spirals. Marble Cone (C.marmoreus) can be identified by a large white sink with numerous triangular black spots, giving her marbling. Shining like a polished shell C.textil different colorful patterns of brown and white dots and spirals.
The cones are very active when they were touched in their habitat. Their apparatus consists of a toxic venom gland associated duct hard proboscis radula Turk, located at the wide end of the shell, with sharp spines, mollusk replacing teeth. If you take the conch in hand, clam instantly puts Radulov and plunges into the body spikes. Followed by a sharp pang, shall communicate unconscious pain, numbness of fingers, palpitations, shortness of breath, and sometimes paralysis. In the Pacific Islands Deaths of collectors of shells from the injection cones.
To toxic shellfish also carry terebru (Terebra maculata). Its shell, like a long, narrow cone, has a peculiar pattern in the form of numerous white spots scattered on the brown or black background.
In 1962, the Pasteur Institute held in New Caledonia study of mollusks, which were the cause of death of several persons, and issued a special document concluded:.
A danger to humans are sea urchins (Echinoidea), coated with a solid shell of the many needles. They are very thin, poisonous stings and each in his own way. The needles are so sharp and fragile that, penetrating deep into the skin, immediately break off and remove them from the wound is extremely difficult. In addition to needle urchins armed with small grasping organs peditsillyariya-mi, scattered at the base of the needles.
Poison sea urchin is not dangerous, but it causes a sharp pain at the injection site. And soon there redness, swelling, and sometimes there is a loss of sensitivity and secondary infection