Fish farming, practiced in Ancient Egypt, as evidenced by the sources dated about 2000 BC, over four thousand years ago. In Mesopotamia, in temples the priests kept the fish in ponds. Fish were kept in ponds in ancient Rome and Greece.
But only in China began to engage in purposeful breeding of different breeds of fish, which we know under the name goldfish.
To the right is a detail of a mural in Egyptian tomb, which depicts a pond with fish
Goldfish is the usual subspecies of the goldfish ( Carassius auratus ). It is assumed that the subspecies living in China, was separated from the rest of toothcarps formed millions of years ago mountains. This subspecies, which is West of the Himalayas is not found, when it was developed ornamental goldfish.
Left – map showing the distribution of toothcarps ( Cypridontae ), to which the goldfish belongs, and the primary habitat of a goldfish. In the wild this fish niceley rivers, lakes, ponds and all dents filled with water. Carp undemanding and can live in flowing and stagnant water. In nature, fish may have different color variations, depending on ambient conditions. The most important of these conditions is light. Continue reading
The black sea resorts of Crimea, Caucasus, Bulgaria, Romania – the most popular in summer and autumn seasons. We will talk about what dangerous marine animals can meet vacationers.
In the Black sea is home to two species of anemone (or sea anemone). This coelenterates animals, on the tentacles which have stinging cells that emit a strong poison. However, they cannot penetrate human skin, so in contact with Actinia he feels a slight burning.
To coelenterates animals are treated and all known jellyfish. The largest jellyfish – eared (Aurelia, or the sea saucer) and kornerot.
Aurelia is easily distinguished from Camerota on telcobridges body shape. These jellyfish are harmless enough, and the consequence of meeting with them is a slight reddening of the mucous membranes of the mouth and eyes.
Kornerot has a mushroom shape, from under a round dome with a diameter of up to half hangs a crown of tentacles. Stinging cells are located at comerota only on the tentacles, on the dome they are not. So IF YOU MET WITH SUCH a JELLYFISH WHILE BATHING, CALMLY TAKE HER HAND to the TOP of the DOME AND TAKE AWAY FROM HIMSELF, TRYING TO keep the TENTACLES have NOT TOUCHED YOUR BODY. Continue reading
Sea aquariums has recently become increasingly popular.
In Europe and America marine aquarium, a phenomenon long familiar, and Russia, the level of development of the marine aquarium, a little ahead of Ukraine.
Although, in fairness, it should be noted that the oldest existing public marine aquarium is located in Sevastopol. Now, the presence of a marine aquarium at home or office likewise the statement that “life is good”.
To have a marine aquarium is prestigious and beautiful, and, finally, very, very interesting. Marine aquarium you can simply admire, and can be observed to the limit of detailed, complex and fascinating world of the coral reef.
But there are a number of factors that hinder the development of this area of the aquarium. And it’s not just a financial issue. Although the creation of a marine aquarium is an expensive enterprise, but the main factor, in my opinion, is the lack of information on the merits. Tell friends about your desire to start a marine aquarium and you’ll probably hear something like: “But it’s so hard.”, “Here’s so-and-so did and, as a result, all fish died, corals missing…” etc., This reaction is quite understandable. The unknown is always, to put it mildly, alarming. Continue reading