Shark is considered the most terrible in their bloodlust marine predator. But it is justice. Such an enemy sharks are dolphins. Why was the shark afraid Dolphin, although their size sometimes exceeds them?
There is a theory that because the shark flees at the sight of a Dolphin that is trying to save his life. Dolphins live in packs, and many testimony and research have their own mind, yet incomprehensible to the people. If they don’t bother people, but on the contrary always help them, it does not mean that soft dolphins are harmless creatures. They are perfectly able, to defend and attack. Dolphins at high speed, beat the shark with its nose in its belly or in the gills . this is the most vulnerable place of the predator. But great speed and a powerful blow to the nose of the Dolphin can be deadly for sharks. At the sight of aggressive sharks attack dolphins and beat it until it is destroyed. If the shark in time will be able to escape, you will not lose a life. This war sharks with dolphins is observed quite often, and the shark is not attempt attacks on people, no matter how hungry, if there are dolphins. Tell you that there have been instances when dolphins to death zabolevanii-nosed porpoises. And it’s not in hunger, dolphins are not by nature bloodthirsty. Continue reading
The aquarium has long been considered not only a stylish decoration but also a useful tool can have a laxative effect. Salon aquariums “Aqua boutique” Petersburg offers a full range of services from installation to decoration aquarium marine aquarium. You
Many aquarists spend your vacation at sea. While Snorkelling, they’re watching sea animals that live on sandy soil, in thickets of seaweed or the rocky coast.
How to make an aquarium
When izgotavleniem the size and shape of each defines itself. In any case, careful execution of work and exact observance of instructions. Together to work easier.
Device for aeration of water
The animals in the aquarium when removed from the water breathing oxygen and expelling carbon dioxide. So water must constantly enter new oxygen, and carbon dioxide removed from it. This exchange occurs mainly on the surface of the water. Continue reading
Our planet is inhabited by almost 20 thousand species of fish. About 1/10 of them are commercial. They give people a lot of valuable products: food, medicines, fertilizers for the agriculture, pet food, industrial oils, raw materials for light industry.
To move in the water, have to spend a lot of energy. Nature took care of the fish, giving their bodies zaradougou streamlined shape. The speed of the fish (scombridae, tuna, sharks) in its form and speed resemble that of a torpedo. The fastest fish is considered fish-sailfish, swordfish and Marlin, which reach speeds of up to 130 km/ h. The rate of freshwater fishes is typically lower, but in critical moments of his life, in the moment of impending danger or in the event of an attack on their prey, they can take a short term shot at a speed of 1-2 km /h. Good speed swimmers usually are found in rivers with current (sabrefish, Chub, nase, Dace, salmon). The speed of the fishes living in stagnant water far below, but they are more nimble, nimble (carp, bream, Rudd). Continue reading