Hazardous inhabitants of the Black Sea
And yet, some sea creatures to be feared near the coast of the Crimea? Represent a threat to several species of fish and jellyfish.
Jellyfish Aurelia has the form of a flat umbrella with a diameter of 10 – 20 cm. Around the edges of which are numerous threadlike tentacles. Rhizostoma – larger jellyfish dome with a diameter of up to 40 – 50 cm. Which departs from 8 large processes. Jellyfish tentacles are equipped with so-called stinging cells; by touching that person receives a burn on both nettles, traces of which are stored in the body for several hours.
The most painful sensations occur when the burn mucous takaney. In the coastal waters of the Crimea is most common is Rhizostoma. Especially many of these jellyfish observed in August.
Marine ruff – a brownish-brown fish, preferring mostly rocky bottom and rocks. Medium size – 10-20 cm. Eleven rays anterior dorsal, one ventral and anal fins have three poisonous glands that produce the toxin. The fish lives on the bottom. At a depth of several meters. In the crevices of rocks. Himself anyone not attacking, but it is very convenient target for marine rifle. Slow-moving, the ear of a Succulent.
Be careful to spearfishing. Do not touch the fins and prickly thorns, located on the back of the fish.
Prick them brings, though short-lived, but quite painful. Poison may have a fever.
The most toxic venom of sea perch in the early spring. Continue reading
The ancestors of modern sharks appeared in the oceans some 350 million years ago. The Earth looked very different then than it is now: continents and oceans have not yet purchased our usual shapes. Ancient sharks swam where nowadays sow wheat and build cities. Therefore, fossils of sharks sometimes discover for tysychi kilometers from the sea. Paleontological scientists studying ancient forms – most often find shark teeth. Fossil shark teeth affect its size. Most krupnye- length of 15 cm. And a weight of 340 g – belonged to the monster in the mouth which could put a man gets up to his full height, and it reached 13 meters in length!
After hundreds of millions of years, descendants of the ancient sharks overcome thorny path of evolution continue to surf the seas and oceans. Sharks, of course, in many ways inferior to more progressive in structure bone fish. Sharks do not have kostey- their skeleton is composed entirely of cartilage (though their ancestors had the skeleton). The gill slits are not covered shark gill covers. And most importantly, sharks, like all cartilaginous fish, no swim bladder. In part, though, the swim bladder shark replace fat deposition in the liver. To stay in the water and sink to the bottom, the shark spends his life in constant motion. Sleep she also prihoditsya- not only coastal and reef sharks can afford to rest on the bottom underwater caves. Gills sharks are not so
soversheeny like a fish bone. and extracting only half of the water of dissolved oxygen (y kostnyh- 80%). The shark must continually move more and to its gills continuously washed with fresh water. Not by chance the shark in captivity become “sleepy” from lack of oxygen. Sharks caught in the network, often suffocate and die long before they pull out. Continue reading
Squids – predatory inhabitants of the oceans
In the water column of the oceans meets many other exotic fish, but they do not form the basis of its biological balance; In this regard, the main role belongs to the small mass form – sardines, anchovies, horse mackerel, herring. These slender fish that feed on plankton, are the main products of sea fishing, they also serve as food for many predatory fish, sea birds, dolphins, seals and squids.
The destruction of small fish squid quite successfully compete with other marine predators. Whole flocks of these cephalopods follow the shoals of fish. The movement of light and swift, developed their speed is not inferior to the speed of dorado or dolphin. Not knowing the rest, worn squid in the ocean in pursuit of prey. Significant energy consumption is compensated by the abundance of food absorbed and respiration rate. Some species of squid, dispersed in water, start in the air and can fly over the waves of 40 – 50 meters. In this way they not only catch up with its prey, but also fleeing persecution larger predators.
Squids can move both head and tail first, and in the latter case the rate of movement will be much higher. Dialing into the mantle cavity water, the animal with the force throws Continue reading