团头鲂原产于长江中游的一些大中型湖泊中,我市于20世纪70年代引进并大面积推广,取得了显著的经济效益和社会效益。近年来我市采用80∶20模式进行主养团头鲂面积也在逐年增加,对该品种的种苗需求量大增,然而在生产实践中,团头鲂群体出现了严重的退化现象,具体表现为生长速度缓? Bream 鲂 native to the middle and upper reaches of the Yangtze River in some large and medium-sized lake, the city in the 20th century, 70 years and the introduction of large-scale promotion, and achieved significant economic and social benefits. In recent years, the city adopts the 80:20 mode to raise the area of ​​main breams, which is also increasing year by year, and the demand for the seedlings of this variety has greatly increased. However, in the practice of production, there is a serious degeneration phenomenon in the group, The performance of slow growth?