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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

Safety on the beach

Jellyfish are attacking the Mediterranean. Biologists-marine painters, studying the waters, is known among the most numerous and diverse populations of marine fauna, are sounding the alarm. If these invertebrates will continue to proliferate at such a pace, will not stand not only marine life, but vacationers here in the summer tourists.

According to Professor Stefano Piraino of Salento University in southern Italy, all 300 (!) kilometers of the beach, which he managed to fly on April 21, swarming with jellyfish. Himself Piraino heads the project control the population of jellyfish in the Mediterranean sea. The shift of the biological balance in the waters in favor of the jellyfish is due, firstly, global warming and, secondly, is due to excessive capture of fish and other edible inhabitants. In addition to jellyfish, thousands of miles of the Mediterranean coast there is no release from tourists onlookers. These “scientists with the air of a connoisseur” and armed with smartphones and “Apple”, relentlessly chasing an umbrella. During the four years of work of specialists in the framework of the mentioned project, the population of jellyfish is only increasing. Experts attribute this phenomenon to global warming. Convince them that the data that come from other areas of the world: is there a process develops in a similar way. Piraino says that on the island of Lampedusa, where the annual resting of about three hundred thousand tourists, you can swim only week of the whole summer. The rest of the time the water is filled with jellyfish.

But that said, the biologist, studying jellyfish at the Institute of Oceanology of Barcelona Jose Maria Gili: “jellyfish have increasingly become a problem around the world, the Mediterranean is no exception. And the farther away from the shore, so they are more insidious and harder to fight them”. This spring off the coast of Valencia Catalogue and specialists of the Institute have recorded a surge of population flowing down jellyfish Pelagia noctiluca . which is one of the most poisonous members of the species. Continue reading

The device of the ponds for maintenance and cultivation

For the keeping, breeding and rearing fish use of different ponds: lined, dug, used peat quarries and instream ponds, cages and basins, small reservoirs and lakes.

The operation and construction of pond intended for fish production, requires compliance with certain rules, which correspond to fish and hydraulic requirements. First, you should determine the orientation of use of the reservoir, i.e. it is designed for the cultivation of food fish or for use in the design of the site. This will depend on its size, the device of the reservoir, depth, shape, mode of operation.

A pond for the cultivation of food fish is very different from the devices of decoration. To this reservoir are a bit different requirements. It does not make sense to do complex bottom topography, indented coastline, depths off the coast, laying on a bed of special soil, decorative elements. The main attention should be paid to the layout of the bed of the pond, the supply of the reset options and a good water supply. Fish farming will benefit, assuming the decision of questions of operation of the reservoir and construction. If the device pool determines much the size of the land plot, which is released under the dispensing reservoir. On the one hand, this ustroistvom or group of water bodies on a farm with a large land area, with another pond in the garden. We must remember that the pond in the garden mostly satisfied mostly your own needs, while the farmer needs to determine how important will be the farming in agricultural production. Following from this, determine its place in economic activity. Perhaps it will be agriculture, where the cultivation of fish will be your main activity or fish farming will become an integral part of the farm with the use of the reservoir complex. The latter area has received wide distribution as well as cultivation of fish goes well with other branches of agricultural production. Hence in the construction of the pond should not exclude the possibility of comprehensive use, for example for watering livestock, watering the garden, fire fighting purposes, breeding waterfowl. Continue reading

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