在美国,利用外来植物食性鱼类控制水草并未得到广泛赞同。争论多半集中于繁殖可能性,对草鱼尤其如此,35个州禁止利用草鱼。1979年,马隆·桑孵化场开始商业生产草鱼杂种,该杂种理应不育,并且,据说可以取代草鱼。该杂种母本为草鱼(2n=48),父本为鳙鱼(2n=48)。Beck等(1980)曾证实,依据1979年该场所生产的25尾标本,该杂种为三倍体杂种(染色体数 In the United States, the control of aquatic plants with exotic plant-eating fish has not been widely agreed. Most of the controversy has focused on the possibility of breeding, especially for grass carp, and the use of grass carp in 35 states is forbidden. In 1979, Maloneens hatchery started commercial production of grass carp hybrids, which should be sterile and are said to replace grass carp. The hybrid was female grass carp (2n = 48), the male parent bonito (2n = 48). Beck et al. (1980) confirmed that based on 25 specimens produced at the site in 1979, the hybrid is a triploid hybrid (chromosome number