Red sea (Arabian Gulf), which is a magnet for divers of all countries, has a diverse flora and fauna.
There are about four hundred species of fish and about eight hundred other representatives of the animals. The absolute majority lives in the southern coastal shallows. A third of them live in the Red sea. Until 1869, the opening of the Suez canal, endemic species were much more, but since then the flora and fauna of the Mediterranean and red seas were mixed.
Both on the surface and in depth (over 2800 meters) in the Red sea water has the same temperature. Up to +44° C, which was recorded in 1964. It is not only the warmest, but is also the most salty sea in the world. In one liter of water contains about forty grams of salts. Continue reading
Pomacanthus is one of many genera belonging to the family of marine angelfish (Pomacanthidae). He currently has about thirteen species. Seven species of Pomacanthus belonged to the genera Holacanthus and Chaetodon; P. annularis and pomacanthus Emperor (P. imperator) still meet under both former names — and Holacanthus, and Chaetodon.
In comparison with other fish the same size pomacanthus characterized by the elegant combination of beauty and grace. P. annularis is a beautiful example of a complex combination of spectacular colors, typical of pomacanthus. Copper-orange body is intersected almost diagonally glowing blue stripes, in the temporal region on each side by a blue ring. The caudal fin is white with copper-orange border, stretches back dorsal, pectoral and pelvic fins are a bright copper-orange on the ventral blue band. This is a classic of the sea a handsome man, and yet he lacks the personality to take a leading role in its kind, since many pomacanthus look just as good. Continue reading
Sharks are color blind
At the University of Queensland examined the eyes of the shark and came to the conclusion that those deprived of color vision.
The research object of scientists were 17 species of sharks. During microspectrophotometric analysis, it was found that 10 of them were no cones, intended for color vision, and their role was partially assumed the highly sensitive sticks. The remaining seven species that belong to three different families, had one type of sensing elements designed to detect wavelengths from 532 to 561 nm.
It is known that whales, dolphins and killer whales also stick with the cones of one type, which is able to recognize green color. Continue reading