近年来,随着淡水养殖品种结构的调整,天津地区精养银鲫的池塘逐渐增多,对苗种特别是规格在50～100g/尾的大规格苗种的需求也逐年增加。由于池塘条件和养殖水平的限制,许多利用银鲫夏花直接培育一龄苗种的精养池塘出塘时银鲫的规格都比较小,一般只有 In recent years, with the adjustment of the structure of freshwater aquaculture species, the ponds of intensive carp crucian carp in Tianjin have been gradually increased, and the demand for seedlings, especially the large-sized ones with specifications of 50-100 g / tail, has also been increased year by year. Due to the limitations of pond conditions and culture levels, many silver carp crucian carp ponds are directly developed when they are used to cultivate first-grade seedlings.