Shark Katran: a safe inhabitant of the Black Sea
In our minds firmly asserted,that sharks are dangerous predators and ruthless killers. However, this description does not apply to the shark katran, which lives in the Black Sea and does not attack holidaymakers.
Shark katran belongs to the detachment of Katranfamily of spiny (canine) sharks. It has a large area of distribution in different seas of the World Ocean, in particular, in the Black Sea. The shark tries to avoid too warm or too cold water. Usually the catran is kept at a depth of 100-200 meters and near the coast, it rises to the surface only at night. As a rule, the fish does not make too long migrations. In autumn, the migration of katran into the areas of mass gatherings of horse mackerel and anchovy begins.
Shark Katran, also known as the prickly shark,is a medium-sized predator and the only shark of the Black Sea. It does not differ in size, its length varies from 70 to 125 centimeters. Very rarely there are individuals in the size of two meters. The weight of the predator is on average 10-12 kilograms. Katran has a well-developed sense of smell, while the shark practically does not feel pain.
The Black Sea shark katran has the same externaldata, like the rest of her squad: light color on the belly, dark on the back and sides, slender spindle-shaped body structure, conical head with a sickle-shaped mouth. A distinctive external feature of prickly sharks is the absence of the anal fin and the blinking ocular membrane - the "third century".
Katran is a shark that does not represent a seriousthreats to people's lives on the Black Sea coast. The only danger to a person is the possibility to get injured by the spiny fins of a fish. Special plakoid scales, which cover the skin of a shark, are close in composition to the teeth and bones. So, the shark scales consist of leather plates that are adjacent to each other and form sharpened peaks. The shark has sharp and poisoned thorns, covered with mucus, but the poison of katran is far from deadly. Katran has small and multi-row sharp teeth, which are renewed throughout life. They gradually drop out and are replaced by new ones.
Shark Katran is a large predator of the Blackseas. The main food of young katrana is small fish, fry and shrimp. For adults, the favorite food is herring, cod, horse mackerel, as well as squid and even octopus. Life expectancy of katrana is quite long - 25 years. Hunting prickly shark in small flocks, following the accumulation of fish.
Shark katran - a viviparous fish, females produceto the light about 14 sharks, which appear fully formed and ready for independent existence. Their mass is 40-50 grams. By one year, sharks grow to 35 centimeters. Complete puberty is achieved by the age of 13-17.
Shark katran often creates trouble for fishermen,eating their catch and destroying the gear, but does not attack the tourists. A sea dog is a valuable commercial fish and a useful food. Meat, liver and cartilage of fish contain a large number of valuable substances for the body that contribute to its recovery. In its meat, which has a pleasant taste and a gentle consistency, contains about 12% fat. Of particular value is the liver of fish, from which the medical fat is produced, which possesses vitamins A and D.