coastal

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The underwater ocean world of giant predatory fish.

The shark with the Latin name is Galeocerdo cuvier biologists determined in 1822, and from that time she was nicknamed the tiger shark. These sharks got their name due to the dark stripes and spots that cover the body of the “minors” of this species. Also in this title to show all the cruelty that is inherent in the shark, which is the second most deadly shark after the great white.

It should be noted that the tiger shark is a part of the family Carcharhinidae Requiem sharks. Despite its reputation, this predator also got another nickname: “sea scavenger” or “scavenger of the sea”.

It turns out that the tiger shark can eat anything from sea turtles and seals, which constitute the bulk of its diet, to more exotic kinds of “food” – rubber tires, beer bottles, nails, a driver’s license, clothes, explosives, crocodile heads, cats, pigs, and even pens, with all their inhabitants (there were precedents). In Australia, for example, was caught tiger shark with a whole and intact head of the horse in the stomach!

Why the tiger shark is called tiger?

So who are these deadly and eternally hungry predators? To begin with, what is this species different from other sharks? Well, as we already mentioned, for shark’s distinctive “tiger” colour, which is most noticeable in young specimens. Tiger sharks have a white or yellowish belly, the rest of the body is painted in cool colors range from bluish-green to dark gray.

At birth these predators have a length of from 50 to 70 centimeters. They grow much larger. An adult tiger shark can reach 4 meters in length and weighing around 680 pounds. Some individuals can grow up to 5 meters and weight gain up to 900 pounds. Continue reading

Corals and fish of the red sea

There are on our planet, the sea of extraordinary beauty, attracting millions of tourists from all over the world for its clear water, beautiful corals and diverse fishes. It comes to the Red sea. This is one of the most beautiful places of our planet.

Why do they call it? No exact answer. Someone thinks that it got its name due to algae that in some months, the sea change colour from azure blue to red. And some prefer a more interesting explanation. According to the Bible, Moses led the Jews from Egypt to Israel through the Red sea. When they approached the shore – the water parted and exposing the bottom. It consisted entirely of canyons, cliffs and hollows. The path was very rugged and a lot of Jews died, bleeding to death. That’s why it was called the Red sea.

The red sea is a Gulf of the Indian ocean. It is situated in the deep depression, formed millions of years ago between the Arabian Peninsula and Africa. An area of almost 500 thousand square kilometers, with more than two thirds of the sea is located in tropical zone. The average water depth from 500 m to 1 km in the middle part of the sea is crack, as if dissecting it into two parts. There is a depth of 2.5 to 3 km. makes it different from other seas of our planetat that the Red sea is not no river flows. The Suez canal in the Northern part of the sea – the work of human hands, it is rather narrow, so the natural circulation of water occurs only in the southern part of the sea through the Bab-El-Mandeb.

This natural isolation has led to the fact that in the Red sea the most clear water. Usually the rivers carry their waters in the sea sand, debris and dirty water. But in this sea water is so clear that you can easily see the incredible beauty and diversity of “underwater life” of the red sea.

The absence of influent rivers has also led to the fact that sea has the most salty water among all seas on our planet. The salt concentration here is that to drown is almost impossible. It is well suited for those who decided to learn to swim and likes to swim far away (fatigue less than in the other seas). Continue reading

Why in the Black sea has become a little fish?

Much worse than with the anchovy and sprats. is the case with the number of predatory fish in the Black sea. In the 1980-1990-ies completely disappeared the population of palamidi, tuna and mackerel. According to the hypothesis of the biologist Y. I. Sorokin from Noumea, on the annual migration paths of tuna and mackerel from the Marmara to the Black sea is irresistible “chemical barrier” is a giant city of Istanbul, all the waste of life in the city with a million residents flows directly into the waters of the Bosphorus. Not only Istanbul, but also all other Turkish seaside towns do not have sewage treatment facilities, resulting in pollution of the Black sea domestic and industrial wastewater.

At least 170 million people are living in all black sea countries, a tangible part of their waste of life and activity is in the Black sea.

Sewage of coastal cities, after cleaning, bring in the sea, it is harmless, even useful minerals that promote rapid plant growth. The trouble is that at the end of the twentieth century these nutrient mineral salts got into the Black sea too much, putting it on the brink of environmental catastrophe. Overfeeding marine ecosystems mineral salts is called eutrophication. The result of this, it is possible to observe on primarycontent sea of slime – filamentous unicellular green algae colonial green Alga, generously fueled by domestic sewage Anapa. The day the simplest tangle of seaweed balls almost doubled in size. In July in shallow water from Anapa to Blagoveschenskaya, grew a huge mass of seaweed balls, and reached 7500 tons! Unicellular algae kladofora prevents the growth of sea grass (eelgrass), green underwater meadows of eelgrass once covered all the sandy shallows. Balls unicellular colonial green Alga shade leaves of eelgrass, entangle and strangle its growth. The eelgrass meadow is the most beautiful underwater scenery and most lively habitat for various species of marine animals – crabs crustaceans-hermit crabs, seahorses, sea eagle, shrimp, etc. Continue reading

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