Mr. Iwanaga has feed sierironisiki for four years, at that time it is called bruceton Zhu Jin, in the course of several years of breeding, after the propagation of large and small 30 times ，breeding experienceIn Japan, the goldfish generally spawn in the spring. In according to such laws, Mr. Iwanaga tried to breed in the spring, but due to warmer climate in Japan than the United Kingdom, the growth of goldfish is relatively rapidly, the tail is also more extended. Therefore, many that have not yet had one-year birthday are often found. Hisae wide Jin, actually did not grow up in the body before they appear out of the tail drooping, the overall state of the tail of a graceful stretch. Ancestors of sierironisiki is bristol Shubunkin. Shubunkin breeding out in Japan went through the United States United Kingdom bruceton and other places, through some improvements, it eventually was named by Bristol Shubunkin .In the UK and other places ,in more than 80 years, the Shubunkin Preservation Society had been set up, and for the first time as a race for raising and breeding of fish. Summer of 7 8 month in bruceton temperatures average is around 22 , so relative to Osaka, it is the better for the goldfish to live a comfortable living environment, it is good for the growth and development of the goldfish . If the goldfish grow slowly, stretching of its tail will be a more slow, the beautiful heart-shaped can form. Some individuals less than one year, whose tail stretching is very complete, are the more responsive to low temperature throughout the year in the United Kingdom Frankly, heart-shaped tail of the goldfish is not attractive, Mr. Iwanaga love those whose heart-shaped tail extending to, who swim with the graceful elegance of the individual in the water. Tail of This type goldfish extends up and down , form a fan-shaped extension.being More interested in fan-shaped tail for Mr. Iwanaga ,he has been pursuing the perfect fan-shaped tail, and so bristol Shubunkin with a heart-shaped tail were renamed sierironisiki . In the Japanese the so-called sierironisiki, is fan that means the tail wide and stretch gesture. Mr. Iwanaga usually chosen in October to 2 months next year to let sierironisiki carried out to lay their eggs so the eggs are laid in early spring, with the temperature of summer gradually rising ，juvenile tail has also gradually extended. Then again in water of 16 20 temperature juveniles were well-fed. in the high-temperature environment of July September, we must pay attention to controlling the amount of bait as far as breed out larger individual. Mr. Iwanaga generally selects after hatching 14 to 20 days for the first time, at that time the juvenile is also very small, it can not be easily distinguished between the merits of the tail shape, so this round of screening, mainly accord to body size , and leave the individual of the better growth. In general, after the first screening the third number will be left, such as 3000 out of 2000 final goldfish. After Incubation 20 days the goldfish is easy to be distinguished from the body on the strengths and weaknesses. First month later, they can judge the merits from the tail shape. Sorting of this period mainly depend on the thickness of the tail. The so-called thickness mainly sort out the individual of the a deep depression of tail center ,and the launching of the tail up and down vertical shape. b at birthing and a month later they were usually fed with Artemia, After a period of time they can be properly fed with frozen bait. To two months , juveniles grow up to 5cm in size, after that they will be able to be feed with artificial feed and frozen fodder. Three months later, color of sierironisiki will show up, and then after about a year, the color can be fixed. There will also be a lot of variegated varieties, the light green individuals are most commonly seen. Moreover this variety is also popular on the favorite fish friends. At sierironisiki appreciation, the most popular variety is more obvious red and black two strains in the future, from now on Mr. Iwanaga will also turned to dark individual on the sierironisiki breeding. In the passed four years, Mr. Iwanaga kept bristol Shubunkin , at the same time bristol Shubunkin -shape slowly fixed, Iwanaga, though that short-tailed goldfish origin should be a trend in the future. As a result, individual large-scale becomes a possibility. 25 30cm size sierironisiki individuals may be more luxurious feeling attractive than 20cm, fan-shaped tail are able to demonstrate most vividly. In fact, China, the worlds first large nation has no shortage of a number of goldfish color, sense of balance sexy goldfish individuals. The species improved technology is superb. Today of Goldfish breeding people gradually reducing in Japan, Mr. Iwanaga has a hope to breed the perfect elegant goldfish , and hope that China will has a large number of goldfish enthusiast