Dolphins of the sea of Azov
The United Nations is concerned about the high mortality of dolphins in the Black and Azov seas and intends to draw attention to the protection of the mammals that are on the brink of extinction. Therefore, 2007 was declared the year of the dolphins.
In the natural world none is more mysterious creature than a Dolphin. The ancient Greek myths has preserved the story of how these inhabitants of the sea have saved the Orpheus. But perhaps little real evidence of the miraculous rescuing person from the sea depths of these noble, do not dare to say, animals?
On the basis of experiments, scientists have concluded that intelligent action is the closest to humans are dolphins. They are faster than other animals to train. Dolphin “language” includes 110 audio expressions. It is a kind of a grunt. hissing, whistling, buzzing, squeaking, rolling in the ultrasonic range.
Dolphins, like other cetaceans, is equipped with sonar that allows to navigate in the water column, to avoid underwater obstacles and locate prey. Precision locators dolphins is that they are at a distance of 25 meters distinguish the bullet that had fallen into the water. However, the biological locators sometimes fail, especially in a storm when the water is polluted with sand and silt, saturated with air bubbles. This can lead to disorientation and death. In addition, delpinova sonars can detect Gill nets, made of nylon, getting to them, animals perish.
Dolphins help people, and people have learned to exploit their extraordinary abilities. During the war the dolphins played the role of kamikaze – undermined the ships with mines. In peacetime they serve as the subject of an interesting scientific experiments, as well as give pleasure to adults and children, for example in the Rostov branch of the Utrish Dolphinarium. And not only that, I wanted to tell you today.
Did you know that dolphins are found in the sea of Azov. Except for the black sea dolphins, bottlenose dolphins (the largest dolphins in the Black sea) and belobochka, abides here and his form – azovka or Azov Dolphin, he’s pyhton. topology Dolphin, pig, Bartok. motor. breather, yet it is called a sea pig! Obviously, this nickname azovka received as a food source for sea people. Azov dolphins are more common in the coastal zone, in shallow waters, where they hunt for fish. They often dive by holding your breath, usually not more than 30 seconds. Compared to other dolphins, they are slow-moving, escorted ships, rarely jump out of the water.
Under the influence of public opinion and in connection with the reduction in the number of dolphins has been a ban on fishing them: since 1966 – the Soviet Union, Bulgaria, Romania, and since 1983 – in Turkey. But after that come across dolphins with bullet wounds. In the sea quite a bit, they keep “herds”. Cetacean mammals at the coast are small: body length – from 90 to 140 cm, and females on average 7 cm longer than males. There were individuals and more – 180 cm, but rarely. And the average weight of a Dolphin is about 30 pounds. They live 20-25 years.
Azovka, bottlenose Dolphin and Bonn conventions listed in the International Red book of IUCN ( IUCN ).
Following the shoals of fish, particularly preferred anchovy, perch and herring, Azov dolphins occasionally appear in estuaries. Known for both single and herd visits the dolphins in the don to Rostov. Basically Azov dolphins feed on benthic fish species such as gobies. In addition, in the stomachs of dolphins found bream, flounder, crabs and even algae. As a rule, in autumn at the coast migrate to the warm waters of the Black sea, returning in spring in the sea of Azov.
Periodically there are cases of mass death of animals. In the early 90-ies of the dolphins were found beached on the coast of the Crimea. Scientists, fishery biologists attribute this to the deteriorating environmental conditions. Most of the dead animals revealed a range of diseases, from disorders of the respiratory system, the digestive organs, the skin to the cerebral membranes. Dolphins are susceptible to human diseases, such as pneumonia. Life in a limited volume of the sea becomes dangerous: pollution by industrial effluents, water transport, and poachers disturb their peace
Change ichtio-fauna, reduced food resources, increased growth of toxic plant organisms (blue-green red algae). All dolphins, especially azovka. extremely sensitive to pollutants, including oil and oil products. Annually on the spit Belosarayskoy. Berdyansk, APR. Fedotov, Arabatsky arrow, O. Herald of the Azov sea shall render up to 200 dead adult dolphins, many dolphins are dying in fishing nets during spring migration.
Dolphins is becoming smaller. In the Black sea, they remained no more 60 thousand, including azawak – about one thousand, bottlenose dolphins less than one thousand. Accurate and current data about the population in the Azov sea, alas, no. But regret is not just about the numbers, you have to feel sorry for dolphins. Remember that these our smaller brethren, formed millions of years ago in the sea remained to live there. People came out of the sea, but is increasingly drawn to the aquatic environment. What he finds there in the future?