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The Salmonidae

belong to the family Salmonidae about 70 species of 'freshwater, cold-water characteristics of the northern hemisphere. Some of these species are anadromous , which make migration from sea to fresh water in order to reproduce itself, like for example the well-known salmon, many of them after the reproductive act, now devoid of energy, and allow dying in the beds of rivers. The Salmonid fish are generally from the body rather slim, but the morphological and biological obviously vary from species to species.

Let's see the list some representative species of this family, making a brief description:

trout (Salmo trutta ) now widely used, because of man, in various parts of the globe it has many subspecies sometimes difficult to distinguish. He lives in freshwater rivers and lakes that fish being a fairly adaptable in various environments, because sometimes even penetrate into the sea. The coloring can vary greatly depending on the subspecies and the type of habitat in which they live. Predatory fish, it feeds on a variety of organisms: insects, small fish, amphibians. Presents an adipose fin located near the stalk caudal. Species much sought after by anglers, does not reach large size compared to those of other salmonids, it's usually a few feet and very rarely exceed two feet in length. It must be said that even if the size heterogeneity is due to the particular environment in which the animal lives, and then to his diet.

rainbow trout (Salmo trutta marmoratus ) considered a subspecies of trout (Salmo trutta ), the trout is a species endemic to Italy and Slovenia, where he lives in Apennine rivers that flow into the Adriatic. Morphologically and biologically similar to the size of brown trout, however, reaches far beyond, could exceed one meter in length and 20 kg. The livery is characteristic: the white sides are covered with irregular dark spots, hence the term "marble", the common name of the species. The back is dark and the belly is white.

salmon (Salmo salar ) : talking about salmon often you can refer to different species, in this case we consider that for us is the most common species, ie The Atlantic salmon (Salmo salar ). Morphology similar to that of "trout" are larger in size, attaining a maximum weight of a few tens of kilograms. Species with sexual dimorphism in the reproductive period has a livery colors more intense. Generally, it is silvery white in the ventral region and olive gray with dark spots in the dorsal region. It 'a predatory fish and has a relatively well developed muscles. They are well known in its migrations for reproductive purposes where, going cold rivers, reaches reproductive places where, after the act of fertilization, often dies. Very important for fish farming area and fly-fishing by sportsmen. Present meat is tasty and rich in valuable omega-3 that has a high commercial interest. It is sold fresh, canned or processed in various ways.

Taimen (Hucho Taimen ): While it is certainly the least known among salmonids listed above, I mention it because it is the representative of the family Salmonidae that reaches the largest ever. Also known as the Salmon Siberian Taimen the is a voracious predator that in exceptional cases exceed two meters in length and 100 kg in weight, but the average weight is 40 kilos. It has the belly is usually white, while the ventral region is olive and reddish in the region becomes more posterior body becoming an increasingly popular and turned red as we approach the tail. The adults of this species feed voracious fish (sometimes large) and also of small terrestrial animals entering unaware of its habitat. It 's a species now considered endangered and is now present mainly in Mongolia and neighboring areas such as Russia and China.

The picture above shows the comparison of the morphological differences between the sexes in Atlantic salmon (Salmo salar ), note the peculiar structure of the male jug (below). Clicking on the scientific name of each of the described fish you can see a representative image.

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Jaws copper

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.

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As many know, some cephalopods, octopus, and in particular, are masters of camouflage in a wide variety of environments, often succeeding to escape the eye of their many predators, including man. The mimicry of the octopus often not based solely on a color variation that makes it similar to the surrounding environment, but also morphological changes of the animal's body so as to make it as close as possible to example a rock. Of all the octopus, masters of camouflage, one in particular does something that makes it look like camouflage or a rock, because what is commonly called Octopus camouflage ( Thaumoctopus mimicus ) mimics very well a few marine species known to be dangerous Depending on the situation and the predator in front of him. For example, this extraordinary animal, able to imitate the dangerous sea snake, the poisonous scorpion fish and even manages to make a sole similar to the shape and swimming on the bottom just like a fish. That cephalopods are the most intelligent invertebrates has been tested by some well-known experiments, which are mainly octopus, but the intelligence of the octopus camouflage, given the extraordinary capacity exceeds all expectations in the world of invertebrates. The animal, which does not reach great size (up to 60 cm in length), was discovered only relatively recently (1998) in Indonesia. Its color "basic" is a dark brownish stripes and white, but within minutes, thanks to special types of pigmented cells called chromatophores, can change color becoming more varied the colors.

In this extraordinary picture representation of how a sole mimic octopus, scorpion fish and a sea serpent.

Click here to see an interesting short film about this unique animal.

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The Irukandji Jellyfish

In Australia, particularly in the region of Queensland (north-east of the country), the danger to swimmers is not only represented by sharks, but by something more subtle almost invisible and therefore often impossible to avoid. This is a very small jellyfish called Irukandji (the name derives from that of a local population), known to scholars as Caruk barnesi , classified in 1967. This jellyfish has a tiny umbrella that does not exceed the size of an olive, with a maximum height then 2.5 cm. It has only four tentacles that can have a length varies widely, from a few centimeters to more than half a meter. A feature that makes it even more dangerous is its transparent body, which, together with being very small size makes it difficult to see into the water. Like all jellyfish have stinging cells that are grouped together but in the tentacles in some areas distinguished by a round shape and white in addition, unlike other jellyfish, the stinging cells are also present sull'ombrella animal. The mix of toxic particulates contained within these cell types (cnidociti) is also very dangerous to humans and in several cases had no effect lethal. The toxin is injected into the victim's body from the end of filaments, like small and long spikes contained within the cells mentioned above, which are "fired" at the moment when physical contact is made. Unlike most jellyfish, the contact time results in only a slight pain that is not so alarming, but after about 30 minutes took over the victim what is known as "Irukandji syndrome" which can be lethal, especially if not properly treated or particularly susceptible to the toxin. After half an hour the symptoms can be different, depending on the person and the amount of toxin injected, but the most common are: severe pain spread to almost throughout the body, pressure is skyrocketing, tachycardia, vomiting. Death may occur from cardiac arrest. In all cases the symptoms last for several days. There is no antidote. A useful thing to do in case of contact, however, is to be paid immediately in the party, vinegar and practice "defuses" the stinging cells that have not yet given their discharge. Scientists are trying to isolate this toxic mix an effective antidote to study and for possible other applications, but the extreme fragility of the body of this animal that is killed by the simple collision with the glass of an aquarium, has complicated matters. One scholar has, however, recently found a good solution the problem, using a circular-shaped aquarium and the sides creating a small stream of water that prevents contact between the small jellyfish and the wall.

In a photo copy of this jellyfish seen up close.

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The Nile perch

A real giant fresh water, the Nile perch (Lates niloticus ) reaches an impressive size, they can sometimes exceed 2 meters in length and 200 kg. The body of this fish is solid, with a rather pronounced dorsal hump. The mouth is very wide and is characterized by a prominent lower jaw. It has two dorsal fins, two relatively large pectoral and ventral fins, an anal and a proportionately small fan located at the tail end of a robust caudal peduncle. The color is generally silvery with greenish, darker on the back and clear on the ventral side of the animal. And 'course, a fish predator and the adults feed mainly on fish of various sizes, while the young feed on insects, crustaceans, other invertebrates and small fish. This species is also present cannibalism, large specimens feed on smaller ones. In addition to the extraordinary size and reach, this fish is notorious for the ecological imbalances that caused after its introduction into the lake Victoria took a few decades ago. In areas where this is very important from the standpoint of trade, but the meat does not seem to be quite valuable, but ... . Given the very considerable size, especially for a freshwater fish, is one of the prey that are the best for the sport of fresh water when traveling in areas where this is to lay a trap with very strong rods and equipment by applying different techniques.

In the photo the Nile perch next to a man makes a fair reflection of the exceptionally large fish that can achieve this.

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The recovery of the glass

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