Not to notice tapeworm in fish is very difficult because it is a length of 20-40 cm, a width of 0.5-1.5 cm, flat and white. Fish tapeworm is a parasite in the intestines, and one of the indisputable signs of infection of the fish is swollen tight abdomen. The carrier of the parasite, as a rule, are freshwater fish such as pike, perch, carp, burbot, and much less sea, mainly of the detachment of salmon. But to track the larva of a tapeworm naked eye is impossible, because it is more than 1 centimeter thin and can be located on the walls of the intestine or in the stomach of fish muscle, eggs and liver.
Notice roundworms difficult, but possible. They are measured not by inches but by millimeters – 25-150 mm in length and about 2 mm in diameter. Thinner than a human hair, semi-transparent, they permeate perpendicular to the muscle of the fish and to protect consumers, sellers use this method as translucence. Fish fillets are placed on a special table whose tabletop is made of glass, and examine under strong light bright lamp. Unfortunately, parasites lurking in the thick fillet or dark fabrics, so consider impossible. Nematodes live in freshwater fish, and in marine and oceanic fisheries (horse mackerel, herring, cod).
Notice the Fluke, the causative agent of opisthorchiasis, without special high-precision instrument it is impossible, because they reach a maximum of 13 mm in length, and the fish are in the form of larvae-capsules whose size is less than 1 mm. this Fluke is the most dangerous to humans parasites in this list. Once in the human body, the larvae will flock to the liver and bile ducts and they grow in a colony of adult worms, after a month or two in infected inflamed liver, pancreas, gall bladder.
Thus, to determine whether the fish infected with the larvae of any parasite without laboratory tests is impossible. Also impossible to put all the fish in this test an industrial scale. But to protect yourself from all these parasites they die with proper heat treatment, chilling or freezing for a certain time, prokalivanii in a salt solution of the correct concentration. The most persistent parasites – Fluke – they can withstand heat up to +120C degrees for 40 minutes remain alive at a temperature down to – 40oC 7-10 days and die only if the salt concentration exceeded 20 grams of substance per 100 grams of fish, and the salting is not less than a week. The good news is that these parasites live only in fish of the carp family the roach, the roach, IDE, carp and Chub. If you can't abandon members of this family, carefully handle all equipment and surfaces that come into contact with raw fish, wash your hands after cutting up and cook the fish carefully by looking at the recommendations of experts.