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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

How to grow coral reef in a saltwater aquarium

The aquarium except marine fish are also produced and corals called reef marine aquarium. Fast-growing corals – usually of the genus Montipora, Acropora, Pocillopora and grow in the aquarium polyp for polyp until until grows a micro-reef.

Light for corals

The word “micro-reef” very often means just a small marine reef aquarium. Coral planting in artificial conditions requires intense lighting, which is rather expensive. Therefore, the smaller the size of aquarium, the less need for coverage, the cheaper it costs.

The need for intensive lighting because the light having the wavelength required for photosynthesis, passing through the water, fades with increasing depth. For illumination with a sufficient intensity of a small light bulb aquarium requires lower power than for lighting large. Besides that they consume less electricity they are also cheaper. Another their advantage is that they are less likely to heat the water. When the aquarium light should know that excessive light is as harmful to corals as weak.

Sea current in the aquarium

A saltwater aquarium requires water circulation. Motion credif places natural growth of coral reefs is very strong. Currents, tides provide a powerful turbulent motion of sea water, which cleanses the mucus from corals, sediments and rock fragments. At the same time it provides the coral with nutrients and oxygen. Therefore, the circulation of water in marine aquariums is essential. Unfortunately, you know it’s not all aquarists. 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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