【摘要】 通过消除对沉水植物生长有破坏作用的草食性鱼类和杂食性鱼类，在低水位的早春选择无风浪的天气移栽水草，于 １９９４年在保安湖一个面积为 ３ ．３ｈｍ^２网栏湖汊成功地恢复了绝迹 ８个月的水草群落，秋季水草覆盖率达 ５０％，同时研究了在无鱼类摄食破坏的条件下苦草和黄丝草的生长动态．于１９９４－１９９５年在保安湖另一个面积为１３３．３ｈｍ^２土栏湖汊（即肖四海）恢复了水草群落，１９９５年秋季水草覆盖率达７０％，由于水草群落的恢复，肖四海结束了施肥投草主养四大家鱼的养殖方式，而采用了以河蟹和鳜鱼为增养殖对象的优质高效渔业模式，１９９４－１９９７年河蟹产量分别达到１６４６．６ｋｇ、１１００．０ｋｇ、８３８．３ｋｇ、４７３９．５ｋｇ，至１９９７年１０月水草生物量（鲜重）２７３０ｇ· ｍ^－２，覆盖率达 １００％更多还原

【Abstract】 The recovery of submerged macrophyte community is very important to the purification of water quality and the restoration of beautiful landscape, and also to the sustentation of the lake fishery with high quality and high economic benefit because the fishery species with high marketprice, such as Chinese mitten crab Eriocheir sinensis H. Mime-Edwards and mandarin fish Sini- perca chuatsi （Basilewsky） , do not grow well without the densely submerged macrophyte com- munity. By catching the herbivorous fishes （grass carp Ctenopharyngodon idellus, Megalobrama amblycephala Yih, Cyprinidae） and the omnivorous fishes （common carp Cyprinus carpio L., crucian carp Chrassius auratus L. ） which are harmful to the submerged macrophyte growth, and transplanting the aquatic plants （Vallisneria natans, Potamogeton macckianus, Myriophyllum spicatum, Ceratophyllum demersum） on the calm days in early spring when the water depth was 0.1 - 1. 0 m, the submerged macrophyte community was recovered in Xiao-si-hai Lake （area is 133. 3 hm² ） near to the middle reach of Yangtze River, China in 1995. Because of the recovery of submerged macrophyte community, the traditional fishery type which applying fertilizer to culture the plankton feeder （silver carp Hypophthalmichthys molitrix and bighead Aristichthys nobilis ） with low market price was given up, and began with a new fishery by stocking the crab and the mandarin fish to gain a great benefit in Xiaosihai Lake. The biomass, cover rate of submerged macrophyte is 2730gm^-2, 100 %, respectively, in autumn in 1997, and the crab production is 4739. 5kg in 1997.更多还原