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
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
Our city Odessa is located on the best sea in the world. There are living animals that can’t cause great harm, it’s just not natural cataclysms.
Lovingly the black sea washes the shores of Russia, Ukraine, Romania, Bulgaria, Turkey and Georgia. It is connected with other seas through the Bosphorus and Dardanelles and the sea of Azov – Kerch Strait.
Our sea is not too big (in the world), but that is not the last place. With a total area of 422 000 km from North to South the sea stretches for 580 km and from East to West 1150 km, the biggest depth – 2210 m, the average – 1240 m.
The length of the coast around the Black sea – 3400 km Into the sea fall into 3 major rivers: the Danube, Dniester, Dnieper.
Known than the Black sea?
First, one of its exclusive feature is the total absence of life at depths greater than 150-200 m (although there are a few anaerobic bacteria), due to the fact that at this depth the water is saturated with hydrogen sulphide. Continue reading