Katran – black (Squalus acanthias ponticus)
Reaches a body length of 2 m (usually 1.5 m). Found only in the Black sea waters to depths of 60 m.
Attention. All kinds of old-fashioned recourses are at the base of the dorsal fin spines small venom glands. When you shot the venom and mucus enter the blood stream and cause local poisoning, often accompanied by severe pain and inflammation.
The naked body is olive-brown above and whitish below. Leads benthic lifestyle, often buries itself in mud and sand. The predator, eats fish. Viviparous species. Body length is more than 1.8 m, weight about 20 kg. In our waters common in coastal areas of the Black and the southern part of the Azov sea common to the coast of Europe to England. The stingrays are very dangerous in water and outside of it (caught the bait, etc.) because they can cause serious injury to the poisoned needle. Known cases ended disability and even death of victims. Continue reading
Sponges that are sold in stores and are used for washing dishes or cleaning the kitchen, not real. They are made from synthetic materials, although very similar to a real sponge and easy to use.
But these sponges appear in the sea, not in a chemical laboratory. For a long time many were convinced that they know all about sponges. It was believed that this plant, until in 1825 a man by the name of Robert Grant proved that sponges were animals!
It considered the sponge in water through a microscope. And saw trickles of water, which went in through one hole and out through another. Still, for many years, scientists did not know what kind of animal. Thought it was a tiny single-celled creatures that live together in one big colony.
We now know that sponges are the dried skeletons of marine animals belonging to the class of “porous”. This is a pretty significant group of animals. Although sponges are one of the lowest forms in the animal Kingdom, their structure is quite complicated. Continue reading
There are many ways to create a pond to breed fish at home – as difficult, requiring a lot of physical and material costs, and simple and cheap.
Before you can create a pond for breeding fish, you should become familiar with the basic requirements to create an artificial pond.
1 the Pond should not be in the shade of trees or buildings, so it can be illuminated by the sun at least part of the day. It is best to create it among the flower beds and close to home. And if the choice of the shape of the reservoir can fully rely on imagination, the depth of the reservoir depends on its purpose. For example, hoping to leave the fish in the pond for the winter, need to build special wintering pits or wells. Continue reading