南湾水库自 1991年开始 ,采取“四项除杂”、增加投放、提高投放鱼种规格、合理捕捞、强化管理和移植银鱼等措施 ,9年共捕捞鲢鳙商品鱼 79 17万kg ,回捕率由 0 6 %提高到 13 93 % ,放养效益达 2 89,渔业总产值达 12 90 19万元 Since 1991, Nanwan Reservoir has adopted a total of 79,170,000 kg of silver carp and bighead carp in 9 years for four measures, such as “removing impurities”, increasing the number of launches, increasing the delivery of fish species, rational fishing, strengthening management and transplantation of silverfish. The recovery rate increased from 0 6% to 13 93%, the stocking benefit reached 2 89 and the total fishery output reached 12 90 19 yuan