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
Dolphin animal. New arguments in favor of this hypothesis given a recent study scientists from the University of Pennsylvania. For quite a long time experts have studied the language of dolphins and got truly amazing results. As you know, the beeps occur in nasal passages of dolphins at the moment of passing through it of air. Managed to establish that the animals used sixty basic signals and five levels of combining them. Dolphins are able to create a “dictionary” volume 1012 words! Dolphins are hardly so many words, but the volume of their active “vocabulary” is impressive – about 14 thousand signals! For comparison, the same number of words is the average vocabulary of a person. But in everyday life people do 800-1000 words.
Dolphin – assisted therapy is a safe and natural way to physical and spiritual health.
Communication with dolphins in the literal sense of the word can work wonders.
Dolphins help children with autism . not able to make contact with others. In addition, Dolphin therapy helps correct brain and spinal cord, depression, chronic fatigue syndrome, muscle fatigue and mental retardation. During the sessions decreases vozbuditelei nervous system and activates the brain. After communication with dolphins has greatly improved the condition of children suffering from various neuroses.
Communicate with the intelligent mammals even helps to talk to children with delayed speech development. Continue reading