At present, scientists have counted about 460 species of sharks, whose species are so diverse that the appearance of many “family members” absolutely does not coincide with our understanding of these predators.
What are the reasons for this diversity of sharks with common ancestors? The main thing is the different living conditions, the variety of shapes and sizes of sharks is related to their habitat and lifestyle.
Chondrichthyes cartilaginous fishes are the most ancient among fish. Ancestors of sharks lived in the Devonian seas 410 million years BC. With a few exceptions, all cartilaginous fishes, and sharks, including, live in salt water.
Dwarfs and giants
The length of the smallest shark found in the region of the Philippine Islands is only 15 cm. Cuban Cunia, a light-billed, dwarf spiny little more – from 25 to 35 cm.
The giant among the sharks is the whale shark (Rhincodon typus), its length is 14 meters, the weight is 10 tons, while it “is on a diet” from small plankton, which is extracted from sea water.
The largest whale shark was caught on November 11, 1949 in Pakistan, near the island of Bab, near Karachi, and was almost 13 m in length, 7 m in the girth of the thickest part of the body, and about 20 tons in weight.
In the course of deep-sea research, a petrified tooth of a megalodon, an extinct shark, which was twice the size of a modern great white shark, was found.
The whale shark has no natural enemies, it has an absolutely peaceful disposition, oceanographers have been able to walk on the back of a giant and even look into its mouth.
The smallest and largest sharks are not dangerous to humans. Predators from 3 to 6 meters, who can easily cope with a man of average height, pose the greatest threat.
Sharks of the Far Eastern seas
In the Far Eastern seas of Russia, in the Sea of Okhotsk and the Sea of Japan, more than 12 species of sharks have been discovered, including ones that are dangerous to humans. The sea of Japan is inhabited by a katran (spiny shark), salmon, hammerhead, gray short-hooded, mako, fox, Japanese carpet and marten, great white shark and other species. The mako and the great white shark are the most dangerous for humans.
Prickly sharks often appear in the summer off the coast of Kamchatka. Outwardly, they resemble a spindle, this form of the body allows you to develop great speed. Prickly sharks got their name because of the presence of sharp spines in front of the dorsal fins. These sharks are small in size, on average, about a meter, and weighing up to 10 kg. Prickly sharks live long, 30-40 years.
Like many cartilaginous fish, spiny sharks are an object of active fishing. Until the middle of the last century, they were caught in huge quantities for the production of vitamin A from sharks liver, then they learned to synthesize vitamin A artificially, and their interest in sharks became less.
Recently, the prickly shark began to be caught for human consumption, its meat can be boiled, fried, canned, smoked. Shark fin soup is popular in Chinese and other Asian cuisines.
Recovery of joints
The greatest popularity was waiting for sharks, when in the middle of the last century many articles appeared that shark cartilage cured cancer. Unfortunately, the miracle did not happen, shark cartilage has not yet become a panacea for cancer. But numerous studies have confirmed the high efficacy of drugs from shark cartilage for diseases of the joints . Osteoarthritis (international name – osteoarthritis) is among the five main causes of temporary disability, and osteoarthritis of the knee joint (gonarthrosis) and hip joint (coxarthrosis) often lead to disability in the prime of life and years; every movement of a sore joint is difficult, the quality life drops sharply. This occurs when the abrasion of the cartilage surfaces of the joint and the lack of lubricating synovial fluid.
In osteoarthritis, both cartilage, and adjacent bone, and other structures of the joint (ligaments, articular capsule, and adjacent muscles and tendons) are affected. Most medicines are aimed at pain relief, but do not have the effect of restoring joint function. The main thing in the treatment of diseases of the joints is to stop the destruction of cartilage, reduce inflammation, normalize metabolic processes in tissues and, of course, reduce pain in the affected joint. Chondroprotectors, substances containing cartilage tissue components, are designed to help it function normally.
For this purpose, experts tried to use the cartilaginous tissue of various animals, but it turned out that the cartilage of marine hydrobionts, including sharks, contain nutrients in an optimal combination and are absorbed faster by the body. Moreover, it is much better to assimilate not natural cartilage, but processed using the modern method, enzymatic hydrolysis. Studies have shown that in the cartilage of sharks there are many different forms of chondroitin sulfates that feed human joints and slow down the destruction of joints. The combination of enzymatic hydrolyzed shark cartilage and other marine life of the Far Eastern scientists used to create the product ARTROFISH . It is effective both in the treatment of osteoarthritis, and for the prevention of this serious disease.
Do not wait until your joints start to hurt, strengthen and support them in advance !