Class – Cartilaginous fish / subclass – Plasminogene fish (Elasmobranchii) / Superorder Sharks (Selach)
History of the study
The history of the evolution of hammerhead sharks has been very successful. In our days it is one of the most common shark species in the world, and in some places they’re just going in astounding quantities. Hundreds of individuals run around seamounts.
Few other species of sharks form such large flocks. This is one of the greatest mysteries of the ocean. Why are so many of these sharks gathered in one place, at one time. Oddly enough, in these large schools the majority are female, and we don’t yet know why this happens.
Widely distributed in tropical and temperate waters of all oceans, except, of course, the Arctic. Most commonly found in the Gulf of Mexico and Caribbean sea, near Hawaii, Philippines, New Zealand and many other seas of warm and temperate latitudes.
Hammerhead shark is truly one of the most unusual sharks. Her appearance seems truly alien, but it is quite common in tropical seas around the world.
When you look at the shark hammer head there is just one question – why this animal has this kind of pharmagology? What is it? And how it appeared? After all, nature creates freaks. And if it generates by mistake, they can not compete with “normal” types and die. All the more strange that there are many types of hammerhead sharks of all shapes and sizes, at least 9 different species. Surely nature could make so many mistakes and “give birth” so many freaks, well there are millions of years?! Continue reading
Fish of the Black sea – a total of 193 species. About all we will not speak. But some of the fish species of the Black sea is worth mentioning.
The mullet is a genus of fish of the family of mullets, numbering two kinds. This valuable little food fish reaches a length of 40 cm red mullet are Distinguished by the presence of long “whiskers” on the lower jaw, which muddies the sand on the sea bottom and catching small animals. Live in the Mediterranean and adjacent seas. Fishing for red mullet .
Goatfish or red mullet
Kalkan, the largest black sea flatfish, reaches a length of over 70 cm and a weight of 12-16 kg. more Dark spin Kalkan (formerly the left side) covered with numerous bony tubercles. Hard skin fish owes its name to the Turkish word “Kalkan” means a shield with additional protection, umbono. Kalkan inhabits sandy and Shelly soils of the seabed. Winter and summer it is the depth, in spring and autumn makes a small migration and moves to shallow water. It spawns from April to July. Feeds on demersal fish and crabs. The body flounders glosses covered with scales. Eyes, unlike Kalkan, moved to the right side. Length of Glossa is not more than 30 cm. Continue reading
The white shark. or Carcharodon carcharias is the largest dangerous predator of modern sharks. Reaching sizes up to 6 meters in length and weights 2 tons, this bloodthirsty salahiya leaves no chance to rescue anyone.
Carcharodon prefers coastal waters of the continental shelf, where a higher temperature. However, for some populations the waters of the Mediterranean sea is a place of their periodic stay.
It would seem that this sea is considered one of the safest. Should I be afraid of white sharks in the Mediterranean and behave as predators in these warm waters? Let’s face it.
Watch the video “the largest and Most predatory fish – great white shark-killer”:
Is it possible to catch white sharks at popular resorts?
The Mediterranean sea connects with the Atlantic ocean through the Strait of Gibraltar. And in the waters, according to recent reports, the number of “indigenous” populations of white sharks has decreased threefold. Unregulated illegal fishing of carcharodon, as a source of delicious food – the fins, the fat, the liver – led to the fact that white sharks in the Mediterranean are on the verge of extinction.
This can lead to katastroficheskie in all the aquatic systems, because this species plays a significant role in the regulation of the number of inhabitants of the local fauna.
However, nature has taken care of its formidable watch the balance in the ecosystem. Right now, the cases of migration of man-eating sharks from the Atlantic ocean – albeit slowly, but they restore their numbers. Continue reading