Fish are cold blooded animals i.e. their body temperature is close to ambient temperature and does not exceed it by more than 0.5. 1 deg. So the speed of metabolism they depend on the water temperature. Only tuna as a result of intensive muscular activity in rapid motion the body temperature may exceed the temperature of water at 10 deg.
From vertebrate fish – the largest group of animals. There are over 20 thousand species – more than the amphibians, reptiles, birds and mammals combined. In the superclass of Jawed (Gnathostomata), which include all fish, from 515 to 550 species belongs to the class of Cartilaginous fish (Chondrichthyes) (chimeras, sharks, rays) and from 19135 until 20980 species to the class of Bony fish (Osteichthyes) (all other fishes, including cartilaginous ganoids – sturgeon and others, which in the adult skeleton presents no spine, and the chord, but there are also bones, mainly covering forming the outer skeleton). In addition, there are about 50 species of lampreys and mixin-jawless fish-like animals, which fish are not. They come in the Cyclostomes (Cyclostomata), belonging to another superclass – Jawless (Agnatha), though are together with fish for the same type of Chordates (Chordata) and subtype Vertebrates (Vertebrata), or Skull (Craniata). About 41.2% of fish are typically freshwater, about 0.6% live in both fresh and salt water (brackish). The remaining 52.2 per cent is marine fish, of which 39.9 per cent live in the coastal waters of warm seas and oceans, 5,6% – in cold coastal waters, 6,4% are deep-sea bottom and bottom-dwelling (benthic) species, 5% of deep-sea pelagic and 1.3% live far from the coast in the upper 200 m of the water column of seas and oceans (epipelagic species). Continue reading
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
Fish enliven the garden pond: for their graceful movements interesting to watch. The role of fish in maintaining the balance of oxygen and carbon dioxide in the water is usually exaggerated, while the benefits they offer by eating mosquito larvae, it is difficult to overestimate. However, the presence of fish in the pond is desirable, but not necessarily, because usually has little effect on the maintenance of the purity of water.
SPECIES OF FISH
When choosing fish are primarily guided by the size of your pond. If you are not strapped for cash, you might want to purchase expensive and beautiful koi. Unfortunately, these fish need special conditions — the surface area of the pond not less than 7.5 m 2 and a depth of at least 1.2 m. At the other end of the scale are hardy and unassuming goldfish and shubun-cytokines, which are able to live in any, even very tiny pond — it is necessary only to ensure that in winter the surface water is not delayed by ice for a long time. Between koi and goldfish is Golden Orff, which required a pond with a surface area of at least 4 m2. Another important consideration is visibility. Motley shubunkin and black telescopes spectacular aquarium, but in a pond they are lost. Better to inhabit a pond of bright — white, yellow, orange and red fish. The most suitable for this is the movable gold zolotarivka and Orpah, because they always stick at the water surface. Continue reading