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
Viviparous fish are among the most popular aquarium fish species. Earned its popularity because of the ease of breeding in aquariums, even without any special conditions. Main popular representatives of the species: guppies, swordtails, and platys mollienesia. Due to the ease of breeding, viviparous fish have been widely disseminated among breeders. They are called viviparous, because they don’t spawn and immediately throw the fry, they develop the female in the abdomen after fertilization by the male of the female. Other viviparous fish kept in aquariums more often. They are less popular because of the modest color or bad habits — excessive aggressiveness or jednosti.
Sex differences viviparous:
Anal fin of females have fan-shaped. Anal fin of the male has the appearance of a twig (gonopodium) and can rotate in all directions.
Mosquitofish. A male and female.
Conditions viviparous fish:
Almost all types of viviparous fish will be suitable tank volume 100 litres, planted with aquatic plants. Some viviparus, for example mollienesia, doing a good job with small growths of algae on the plants, thereby helping us in cleaning and maintaining an aquarium. But there are those types of viviparous fish that don’t mind to eat some plants, especially tender leaves. Continue reading
Every year commercial fish species is becoming less. Scientists warn that may soon Ukrainians can not take grandkids fishing — will catch nothing.
“Back in the thirties dried up stoked the stove”
— In recent years we have almost completely destroyed river ecosystem, — says Sergey Mezhzherin, doctor of biological Sciences, Professor Institute of Zoology. I. Schmalhausen. — In Ukraine there is a huge estuary — the sea of Azov, which was considered the most cost-effective and highly productive ecosystem. Here the fish bred naturally. About how much it was in Azov sea, says a historical example: in the area due to the lack of firewood up to the thirties of last century the house was heated by dried specimens, casting them into the furnace instead of logs. Now it seems incredible, however, the number of freshwater fish in the country (even compared to the seventies of the past century) has decreased at least thirty times. Peregorazhivanie dams of the Dnieper, Kuban, don, led to a sharp saloneni water. Now we can confidently talk about a real environmental disaster and in fact of mass death of fish in the rivers of our country.
“Every year in Ukraine disappear two rivers”
Another reason for the lack of fish in Ukraine: loss of grasslands and floodplains — the most scarce of the environment and natural resources in our territory. In addition, in recent years disappear… the river. For example, on the Kiev — Odessa highway signs with the names of small waterways exist, but they are not. They are either overgrown with weeds or completely gone underground. Continue reading