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1、选择法改良新种:美国佛罗里达州泊尔梅特水产公司采用选择性繁殖技术,经8年时间28代的繁殖,将一种罗非鱼培育成只有一根脊椎,其余鱼刺全部退化的食用鱼。成鱼个体重约0.75kg,肉味鲜美。一尾雌鱼每年繁殖6000尾鱼苗。目前这种无刺鱼推广到美国许多州和其它一些国家。2、基因移植法:美国马里兰大
1, selection method to improve the new species: the United States Florida Parmes aquaculture companies using selective breeding techniques, after eight generations of breeding 28 generations, a tilapia breeding only one spine, the remaining fish spines all degenerated Food fish. Adult fish weighing about 0.75kg, delicious meat. A females breeding 6000 fish fry each year. The current non-barbed fish to many states in the United States and other countries. 2, gene transplantation: the United States Maryland