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
Today is the international Black sea day. A few Crimeans know that the sea in which they so love to swim, listening to the sound of waves, breathe the sea breeze, in many ways unique. We offer you a selection of interesting facts about the Black sea.
1 – Mountains around the Black sea are constantly rising, and the sea itself increases. And if the mountains grow only a few inches per century, sea occurs on land with a speed of 20-25 cm over 100 years. Some ancient cities had already disappeared at the bottom of the sea.
2 – Among planktonic algae found in the Black sea, there is a very unusual view nochesvetka. She has the ability to Postretirement, and because of it in August, the Black sea is sometimes lit.
3 – the Only mass shark inhabiting the Black sea prickly shark Katran. He is afraid of people and rarely comes to shore. The only danger to humans represent the dorsal fins of crambe with large poisonous spikes. Continue reading
In different areas of Russia called the speckled hen, petrohol, spectracom.
It’s a nickname very well, because the body of the trout decorated with red, black and white speckled. Color and brightness depend on water and soil, food and even the time of year; during spawning, the colour is more saturated.
Speak for themselves names such as Rudd (this fish are bright red, like the feathers, fins), Chub (it has a thick head with a wide and flat forehead). But the Beluga, the largest (up to 4 m) commercial fish of the sturgeon family, it got its name by the color of the belly. In the Russian language as the name of a fish, the word Beluga is already known in the XVI–XVII centuries In the same “Story about the Ruff Ershovite” the Beluga is the name of one of the judges. (The phrase “roars like a Beluga” refers not to the fish, and the Beluga whale to the Dolphin.)
Freshwater fishes live in the internal waters, almost not containing salts. The figures on the left depict some commercial fish that live in streams, ponds, lakes and rivers. Continue reading