英语金鱼的生长过程

英语金鱼的生长过程
英语金鱼的生长过程

英语金鱼的生长过程
Goldfish is a golden yellow of wild carp evolved.
Before the millennium,due to the limitations of scientific knowledge,people have such a mutation occurred in the wild carp,will inevitably produce a sense of mystery.At that time,a time when Buddhism entered China,which further promoted the Golden carp to goldfish direction.Why?Because Buddhism advocates good deeds,and forbids killing of Health.Buddhist believers who do good deeds in order to Jide,often bought the release of the arrested animals,known as "let go." Those people are mysterious,golden carp,they became the first to become the object of Letting Them Go (by Letting Them animal addition to the golden carp,there are turtles,turtles,birds,etc.).Such a move to protect the golden carp,but also to change their living environment,so golden carp begins with the wild into the semi-domesticated state.Now known in China as early as a separate breeding golden carp who is the early years of the Ding Song praise,he served in Jiaxing Wu Yue State,when the provincial governor,in their own goldfish pond farming gold and crucian carp.Subsequent to the Southern Song Dynasty Emperor Zhao Gou Wanwusangzhi,obsession with keeping a variety of small animals,he Deoksugung Palace Dajian gold fish ponds,and exotic species around the collection,which will become the beginning of the Chinese court goldfish breeding,have elapsed since the 900 years of history.Song after the various dynasties of subjects,from royal relatives,down to his ministers,most like to watch goldfish breeding.Especially in the Yuan Dynasty,the palace specially built "Crystal Palace" breeding goldfish,which the Crystal Palace should be the first aquarium in China.Bureaucrats hired a lot of experienced fish workers,specializing in breeding goldfish.Somewhat good,under the effect of the will.People have begun to use big tub,Xiaopen breeding goldfish,and form a series of "business":raising and selling goldfish goldfish,and Shaozao fish pots and sell fish pots,and fishing and selling fleas fleas waterlogging of ......We had a goldfish breeding industry,the new varieties are constantly emerging.The working people in ancient China to foster goldfish,paid the hard work,accumulated a wealth of experience,has trained no fewer than 300 varieties of goldfish.

In the wild, goldfish can be found in slow-moving, freshwater bodies of water. As with their close relative the carp, they thrive in slightely sludgy water. In an aquarium, bi-weekly water changes are...

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In the wild, goldfish can be found in slow-moving, freshwater bodies of water. As with their close relative the carp, they thrive in slightely sludgy water. In an aquarium, bi-weekly water changes are a good idea as a goldfish tank is hard to keep clean. They thrive in a pond environment thus the addition of real plants is optimal if the owner is prepared to replace them fairly regularly; goldfish enjoy eating live plants. An aquarium with a dirt bottom is ideal but difficult to maintain. Small pebbles are a suitable substitute for the pond-like bottom. Typically, goldfish will survive in water temperatures ranging from freezing to 30 degrees centegrade. Fancy varieties(orandas, lionheads, ranchu, veiltailes...) should be kept in water no cooler than room temperature.
Goldfish usually mature in their second year but this varies with diet, water temperature, and other environmental influences. In the wild, breeding occurs during the summer; breeding can occur year round in indoor aquariums. Mature female goldfish will become rounder during breeding; males develop tubercles (small bumps) on their heads, operculi, and pectoral fins. Males chase the females for several days before spawning occurs. Females can produce several thousand eggs per spawning period every 8 to 10 days. Eggs are not guarded. Goldfish eggs hatch in about 4-5 days at 18-20 degrees centegrade (64-68 degrees F.).
Although there is one report of a pet goldfish who lived 43 years, 25 years is a more reasonable maximum lifespan for a goldfish kept in a pond. In an aquarium, ten years is more likely. In the wild, lifespan is undoubtedly less.
In the wild goldfish will school to a certain extent. In aquariums or bowls, however, they can be kept separately. Goldfish are not particularly aggresive, thus combining sizes is not often a problem. It is worth suggesting that varieties which are drastically different should not be combined in a tank: e.g. a slow, heavy-bodied, veil-tailed Oranda with a fast, slightly more aggressive variety such as a comet.
另外一篇
During a 60 d feeding trial, goldfish (Carassius auratus) measuring 1.66 +/- 0.02 g by weight and 4.2 +/- 0.02 mm by length were W diets containing 23.34%, 26.21%, 29.30%, 32.24% and 42.53% crude protein in Feeds I through V respectively. The four formulated-diets (Feeds I, II, IV and V) contained groundmit oil-cake, wheat bran. soybean meal, fish meal. cod liver oil. vegetable oil and vitamin-mineral mixture with tapioca as binder and a commercially-available diet (Feed III) procured from the market. All the feeds were dispensed twice daily at 4% body weight. Results revealed that the growth (in terms of net weight gain and specific growth rate) and dietary utilisation (in terms of feed conversion ratio, protein retention efficiency and energy retention efficiency) were observed to be significantly greater (p less than or equal to 0.05) in Feed V which contained 42.53% protein followed by Feeds IV. I. II and III. and 7.58%. 6.11%, 6.63%, 7.86% and 7.91% lipid in Feeds I through V, describing clearly the role of a combination of protein and lipid in the diet for growth and feed utilisation. Lowest growth and dietary utilisation was observed in Feed III (the commercial diet). The alkaline and acid phosphatase activities in liver, gill and intestine as also the RNA:DNA ratio in the muscle tissues were greatest in fish fed Feed V, which indicated best growth. It was thus concluded that a protein content of 40-45% in the diet of young goldfish could significantly enhance growth and dietary utilisation

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