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copper shark (Carcharhinus brachyurus ) belongs to the family of Carcharhinus, all formidable predators, which may be more or less fast and powerful. Several species of this family are potentially dangerous to humans. Our shark is considered a large shark, as in some (rare) cases exceed 3 meters in length, are common sizes of just over 2 meters. The body has a long slender snout and ends in a little flattened ventrally back and slightly rounded at the apex. The mouth is relatively wide and has triangular teeth and finely serrated. The pectoral fins are quite developed and the caudal fin, as in most sharks, it has the upper lobe markedly longer than the lower one. The color (which gives it the common name of Italian copper shark) is mainly olive-bronze on the sides, darker on the back lightens to white belly. The English name is Copper shark is also commonly known worldwide as bronze whaler. It 's a species with wide distribution , also present in the Mediterranean . Usually frequents the waters near the coast, but can also be found in the waters offshore. L ' power is varied because it feeds on various bony fishes, small sharks, rays, cephalopods and some carcasses of cetaceans. It 's a placental viviparous species, ie there are no eggs and embryos developing derive nourishment directly from the mother's body. The number of sharks give birth to each event is an average of 15. Although it is considered dangerous and on many occasions attacked the man (maybe never with fatal outcome) is much less dangerous than the well-known species that cause a number of attacks and casualties much higher. Given the edibility of the meat is caught with nets and longlines, also is coveted by those who practice shark fishing . The biggest recorded specimen ever caught was over three meters long and weighed just over 300 kg .

I propose the following interesting and exciting part of a report of someone who, at first, this large predator fish bringing it to the bank:

Vittorio Azzano (Sharkman): Link to report

In pictures (courtesy of V. Azzano) you can enjoy this fantastic predator drawn on the bank "Skeleton coast "(Namibia) by Victor on one of his many fishing trips targeting shark in Africa.

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Coral reefs

Coral reefs are one of the most biodiverse ecosystems in the world, are also the marine environments characterized by the greatest number of species which present a high diversity of shapes and colors. They are distributed in inter-tropical, because, in order to exist, they require temperatures "high" water should never be less than 20 ° C or so. They are living structures, they are in fact better or "constructed" by some particular types of corals ( Madrepores ) said just reef-building, corals or manufacturers can consolidate and secrete a limestone skeleton strong and able to withstand the waves, sometimes very strong. The existence of these corals, which are almost all colonial polyps, is due to the symbiosis between them and some unicellular algae, the zooxanthellae , in a very close association called symbiosis. The reef-building corals, in fact, in the absence of such unicellular algae would not be able to grow, reproduce and secrete their calcareous skeleton, could not even survive on their own algae secrete some sugars are crucial for growth of the colony. Given their close dependence on symbiotic algae, corals can not survive beyond certain depth, as the light would fail to reach the algae, preventing the photosynthetic process and making them die, thus blocking the formation of limestone skeleton. This depth depends on the transparency (or vice versa turbidity) of water, but generally a limit of few tens of meters in conditions of perfect transparency (water corals need to grow as transparent as possible). The Great Barrier Reef Australian (the north-eastern Australia, off the coast of Queensland) , with its 2,300 km, is the structure largest living land. Despite the poverty of nutrients present in its waters, it has a high number of species of marine organisms belonging to very different groups with each other and about a third of the entire fish fauna of the oceans is concentrated right here (including a large number of species shark). In recent years, increasing temperatures is happening on a global scale, together with other secondary factors, are helping to destroy the delicate balance between symbiotic corals and their small algae, thus requiring the expulsion of the coral seaweed . The coral die and he will remain only its skeleton of limestone, a phenomenon known as coral bleaching. And 'good remember that corals living in areas of the planet where the temperature is already high for her, and then a slight rise in temperature can be fatal to a sensitive ecosystem such as coral reefs. The problem of raising global temperatures, although the principal does not seem to be the only one. Another problem that may prevent the normal development of coral reefs could be caused by dirty water of nutrients from rivers that receive water "fertilizer" from the farmlands of intensive agriculture. The excess of these nutrients favors the formation of a "carpet" algae that covers the coral, leading to death and preventing the recolonization by new larvae from not contaminated by neighboring sites. Another problem that occurs on these two is increasing acidification of seawater by the increase of carbon dioxide in the air that you are having in recent decades. The acidification makes it difficult, if not impossible, the construction of the limestone skeleton by the coral polyps. According to some researchers who have conducted extensive studies on these cases, in about 40 years it will inevitably lead to total collapse of this beautiful marine environment and return to the initial state will be very difficult, perhaps impossible.

In a beautiful photo aerial image of the Great Barrier Reef in Australia.

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Sharks of the Mediterranean octopus imitator

The Mare Nostrum, despite occupying a surface and a very low volume in relation to the salt waters of the entire globe, is home to a large number of shark species. Of the 50 species described to date in our basin, many are uncommon, difficult to observe, others are rare. For these rare species found there have been few sightings, if not unique. Let us now make a brief description of these species of cartilaginous fish and the most common known with respect to the families.

Among Hexanchidi include the S when they discriminate mas capopiatto ( Hexanchus griseus), also known as gray Notidano 6 and characterized by having gill slits instead of the usual 5 in almost all other sharks. It 'a very large shark, which normally lives at considerable depths approaching the coast overnight. It can reach 5 meters in length and 500 kg. It feeds on the bottom of small sharks, rays, mollusks, crustaceans and fish. In some places it is popularly known as the "cow fish" and is sold in slices of the market under the name "veal of the sea." For the family of

Carcharhinus include the sea for our Blue Shark (Prionace glauca ), deep-sea shark with a very streamlined body, a great swimmer and an active hunter.

To the family of small sharks belong Sciliorinidi long known and marketed in some places quite like Gattuccio ( Scyliorhinus canicula ) and Leopard ( Scyliorhinus stellaris ) more largest of its congener S.canicola . Both species live on the bottom and lay eggs that are laid to the substrate, protected by a housing characteristic.

The family belongs to the shark Triakidi considered perhaps the most common because they often present at the fish market, we talk about Palombo ( Mustelus Mustelus ) and its close relative the starry Palombo ( Mustelus asterias ).

Although not common I think it appropriate to mention the biggest shark in the Mediterranean, belonging to the family of Cetorinidi , the Basking shark ( Cetorhinus maximus ) along up to 15 meters and is the largest fish in the world after the whale shark, which was lacking in our area for which is the biggest fish in the Mediterranean. It feeds on plankton organisms that capture filtering the water with its gills anatomically altered and the wide mouth. For the family of

Centroforidi include the Leafscale gulper shark ( Centrophorus granulosus ) up to 1.5 meters long. For the family of

Lamnidi (which belongs to the Great White Shark, also present in the Mediterranean) include the Mako (Isurus oxyrhynchus ) and Porbeagle (Lamna nasus ) the meat of which are sometimes present in the fish stalls. Both these species are fierce predators and potentially dangerous to humans.

to remind the family of the Alopiidi thresher sharks (Alopias vulpinus ) with the excessively long tail which it uses as a whip to stun their prey, usually small fish, which feeds.

conclusion I want to emphasize that the few shark species potentially dangerous to humans should not be considered a threat since the attacks are very rare and not always fatal, often the meetings are also due to the lack of foresight of man in an environment that is not his. All of these species should be protected as important to the marine ecosystem given the role of top predators that play. The data on the decline in shark populations in the Mediterranean and around the world are truly staggering as these "killer" of the seas are actually very delicate and vulnerable and are exterminated by man that is not asked any scruples against them. The sharks in our ocean are often victims of accidental pelagic nets, placed in the sea to catch other fish species of interest such as tuna and swordfish, and fishing gear such as longlines with hooks, often several miles long.

Click the scientific name of each shark (put in brackets with text written in italic and Celestino) to see the corresponding photos.