张家口地区地处塞外,气候较冷,自繁自育龟苗只有90天的生长期,鱼种规格小,只有7厘米左右,而且,育种成本高,产量低。用户放养的小规格鱼种当年不能捕捞,产量低而不稳。地区水产良种推广站,为了培育大规格鱼种,从武汉用飞机购运“水花”鱼苗试养,获得成功。经二年试验,从江南引进的“水花”鱼苗,培育的鱼种规格达15厘米以上,春季放入养鱼池,秋捕时每尾个体重达500克以上。今年反“南花北育”,培育大规格鱼种作为提高商品鱼产量的一项主要措施。随着气温的回升,当水温达到18℃以上时,他们于5月下旬又及时从武汉空运回草鱼、花鲢、白鲢良种水花鱼苗1460多万尾,入池后,经过科学饲养管理,20天水花就长到了3厘米以上的夏花,并放入200亩鱼种池培育大规格鱼种。“南花北育”使鱼种的生长期由90天延长到130天, Zhangjiakou area is located outside the plug, the climate is cold, turtle self-breeding only 90 days of growth, small size, only about 7 cm, and breeding high cost, low yield. Small-scale stocking user stocking that year can not be fishing, low yield and instability. Regional aquaculture seed promotion station, in order to cultivate large-scale species of fish, from Wuhan by plane purchase “water” fry trial, to be successful. After two years of testing, the “water flower” fry introduced from Jiangnan has a size of more than 15 centimeters and is put into a fish pond in spring. Each autumn weighing 500 grams or more. This year against “Southern Flower North” to breed large size fish species as a major measure to increase the output of commercial fish. As the temperature rose, when the water temperature reached above 18 ℃, they returned airlifted grass carp, silver carp and silver carp in the late May in time in Wuhan in a timely manner. Over 14.6 million waterfowl fry were introduced into the pool. After scientific feeding and management, 20 Tianshui flowers grow to more than 3 cm summer flowers, and into the 200 acres of fish breeding ponds large size species. “South Hua Bei Yu” to fish growth period from 90 days to 130 days,