Living environment and habits of koi

I. requirements for living environment of koi

Koi and goldfish do not have strict requirements on water temperature and water quality, and the range of turbidity in which koi lives is 2Mel 30 degrees Celsius. Although the koi has strong adaptability to the environment, it has the weakness that it can not resist the rapid change of water temperature, such as long-term artificial breeding, the rise and fall of water turbidity is 3 degrees Celsius, and the temperature drop or rise is more than 2 degrees Celsius, the fish is easy to get sick, and when the temperature rise and fall increases to 7 degrees Celsius, the fish will crawl at the bottom of the water and do not eat. If the sudden change in temperature is medium and large, the koi will even die immediately. The most suitable water turbidity for koi life is 20mur25 degrees Celsius, in this temperature of water, koi swimming active, exuberant appetite, strong physique, bright colors, due to the development of science, in the homes of lovers with conditions, such as the use of turbidity retention device and cooler to adjust the water temperature in winter and summer respectively, to control the most suitable water temperature for koi growth, so that fish can have a comfortable environment and grow rapidly. Koi lives in the water by absorbing oxygen dissolved in the water by their gills, sending oxygen to the fish and combining the absorbed food nutrients to produce energy to maintain life, so whether there is sufficient oxygen in the water is the key to raising fish well. according to the results of the study, the amount of oxygen needed per kilogram of body weight per hour is 35 mg / L when the water temperature is 5 degrees Celsius, which proves that the higher the water temperature, the greater the oxygen consumption.

Koi is also suitable for living in a slightly alkaline, low hardness water environment.

2. Feeding habits of koi

Koi is omnivorous and is eaten by general molluscs, fragments of higher aquatic plants, benthos and even tiny algae. As the koi adapt to a wide range of food, and the requirements for other living conditions are not very strict, so the vitality is strong. With the change of fish growth and different seasons, the feeding situation also changes. Koi has the highest feeding intensity in summer and almost no food at all in winter. The newly hatched larvae generally feed on rotifers and small cladocera, while those more than 3 centimeters feed on benthos, insect larvae, shellfish, snails and fragments of aquatic higher plants. Koi can not only swallow feed, but also extract food from pond sediment. Koi has no teeth in its upper and lower jaws and often chews hard food with well-developed throat teeth.

3. Growth and development of koi

(1) in addition to the level of water temperature and the abundance of food can affect the growth rate of koi, there are also great differences between female and male fish. Brocade carp can be said to be quite large when they are more than 90 centimeters long. however, at an oral evaluation meeting in Japan, there was a red pine leaf koi with a body length of 125 centimeters, and even a record of 150 centimeters long and 45 kilograms of super giant carp. The lifespan of koi is very long, generally up to 70 years. According to records, there is a Japanese red carp named Hanako, which was born in 1751 and died in 1977 for 226 years. The fish is 77 centimeters long and weighs 9 kilograms. It can be called the "old birthday boy" of the koi group. The age of koi is the same as that of most fishes, and the number of annual rings of scales is determined, that is, the age of koi.

(2) the gonadal mature age of the male carp is 2 years old and the female fish is 3 years old. after the gonads mature, they begin to spawn and reproduce, and then the gonads periodically mature and reproduce once a year, and the spawning period is usually from April to June every year. However, there are also autumn spawning and reproduction in southern Japan, because of the original climate, the spawning nests of koi in these areas can mature twice a year.