Goldfish History of goldfish breeding Asia has at least a Millennium and originated from children’s hobby to collecting in which the housing was offered and developed in cages, in pens, in wells, in tubs and barrels for all small and medium animals — as the first kind of Pets at home.
In China and Korea over a thousand years ago was engaged in not only fishing, but also breeding and raising goldfish. Over the years of breeding the Chinese fish farmers emerged and established natural mutations with drastic changes in body shape and structure of the fins, the eyes, the structure of the skin and staining fish were obtained decorative forms and color variations, which became the core of most of today’s known species.
The first written mention of the Golden fish with red scales came from China during the reign of the Qing dynasty (265-420 ad). In those days, these fish were spotted in a lake in the mountain Lushan, near the river of the City — near the modern province of Shaanxi, which flows to the South China and Northern Vietnam. In the ancient Chinese treatise Shan Hai Jing, presumably written in the late centuries BC — the beginning of our, there is also a record of the “red carp”. However, there is absolutely no certainty that these wild representatives were the ancestors of segodnyashnaya fish. It is assumed that the red coloration was obtained as a result of purposeful breeding work first pet lovers and falls on the reign of the Tang dynasty (618-907 years of the new era). Continue reading
The first thing we need to think about is the size of your aquarium. Much easier to maintain in good condition a large volume of sea water than small. The minimum size of marine aquarium should be 100 x 50 x 50 cm the larger the aquarium you can afford, the better.
Technically, the organization of the aquarium with sea or brackish water is absolutely the same as freshwater. The main difference is only that in water you need to add salt. Since this water is in increasingly corrosive than freshwater, aquarium eliminated any metal objects. The destruction of the metal in the water can lead to poisoning of fish.
All items used for preparation of water and irrigation of the soil (buckets, colanders, spoons etc.), should be plastic. If you have an external thermostat, stick them to the glass and do not hang on the wall of the aquarium with the help of metal hooks with which they are sold. The same applies to the combined instrument heater-thermostat Even fixing of luminescent lamps to the cover must be non-metallic.
For most of us to use clean seawater is not possible, because either we live too far from the sea, or the seawater is heavily polluted. Manufacturers produce salt for artificial sea water at the correct ratio of minerals that the fish need. You just have to mix the salt with tap water in accordance with instructions to obtain the required specific gravity of the final solution. Continue reading
Sharks belong to the order of elasmobranch.
Their length ranges from 0.2 m (Black barbed) up to 20 m (giant). Shark is widely distributed, mainly in tropical seas.
The story of the gifts of the ocean would be incomplete if not to mention the meat of sharks. It is used in food many of the peoples inhabiting the shores of the seas and oceans. Fin soup sharks since ancient times is considered as a delicacy, like a turtle.
From the skins of sharks previously made a very expensive shagreen skin. In some countries of Asia and Africa of durable and beautiful leather sharks make even shoes and haberdashery. The dried skin of sharks is used for polishing of precious wood and brushing the felt.
From the liver of sharks get fat, reaching for food, medical and technical purposes. Finally, the shark teeth are used as Souvenirs, and from the spines make canes, from the skeleton – glue. This is the range of use of sharks in the economic life of man.
Shark meat has long been valued in different countries of the world, and many did not even know that they praise the shark meat since it was sold under various names. For example, from Turkey in pre-revolutionary Russia, the fishermen brought Balik from shark-Katran, presenting them balyk of sturgeon. U.S. fish sticks of porbeagle and Mako shark sold under the form of sticks made of the swordfish. Shark meat soup, processed food paint, sold in some countries as macrosomia, shark meat-foxes and other sharks — as meat halibut, Croaker, cod, etc. Continue reading