In the international programme Edge of Existence focused on the study of endangered species of animals, sharks, rays and chimeras (fish with cartilage instead of bone) is presented for the first time.
The majority of sharks is at the top of the food chain, their existence is of great importance to maintain the balance of the fauna of the oceans. If sharks disappear, it will have an impact on the fish population and, ultimately, on the lives of people.
According to research, the fishing, both targeted and random, has led to a sharp decline in the population of different species of sharks. Their number was also influenced by the reduction of habitats due to development of coastal areas, degradation of mangrove forests, water pollution and trawling.
According to Dr. Matthew Goloka, an employee of the London zoo, under the threat turned out to be the most interesting and unique representatives of sea fauna.
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Earth is the third planet from the Sun and the fifth among all the planets of the Solar system in size.
Age – 4.54 billion years
Average radius – 6 378,2 km
The average circumference – 030,2 40 km
Area – 072 510 million km2 (of 29.1 percent and 70.9% water)
The number of the continents – 6: Eurasia, Africa, North America, South America, Australia and Antarctica
The number of oceans – 4: Atlantic, Pacific, Indian, Arctic
Population – 7.3 billion people (50.4% of men and 49.6% women)
The most densely populated States: Monaco (18 678 people/km2), Singapore (7607/km2) and the Vatican (1914/km2)
Number of countries: a total of 252 independent 195
The number of languages in the world – about 6,000
The number of official languages – 95; the most common are English (56 countries), French (29 countries) and Arabic (24 countries)
The number of nationalities – about 2 000
Climatic zones: Equatorial, tropical, temperate and Arctic (main) + sub-Equatorial, subtropical and subarctic (transitional)
“The disappearance of even one species from this list may result in the loss of millions of years of evolutionary history,” he says.
Fine teeth pilaris (Pristis pristis)
This kind of ramp can disappear completely due to the non-renewable fishing. Often the animal itself randomly enters the network. Its distinguishing feature — the front part of the head (rostrum) with many sharp teeth with which it destroys its prey. When some of his skin did cowboy boots.
A subspecies of the Brazilian Martini — electric ray Narcine bancroftii
The ramp uses an electric discharge to stun prey. During the day the animal hiding in the sand at the bottom, and at night it hunts and eats.
Zebra shark (Stegostoma fasciatum)
The shark changes its appearance throughout its life. Calves are born with stripes like a Zebra, which are then replaced on the spot. The shark lives at the sea bottom, the duration of her life — 25 to 35 years.
Whale shark (Rhincodon typus)
This shark is the largest fish in the ocean, it reaches 20 meters in length. Feeds on plankton and small fish. Most of the time, the whale shark is kept near the surface of the water. Swims very slowly, usually at a speed not exceeding 5 km/h and poses no danger to humans.
The basking shark (Cetorhinus maximus)
The basking shark is the second largest fish after the whale shark. Like the whale, the basking shark feeds on plankton, but does not suck the water, just swims with an open mouth, filtering through the gills everything will fall into it. The basking shark can filter up to 2,000 tons of water per hour. These sharks are not dangerous to humans and has long been a valuable commercial catch. The catch led to a reduction in population to a dangerously low level.
As reported by “Around the world. Ukraine”, the oceanographers had spied for the life of the embryo leopard sharks.