南漪湖银鱼资源衰退原因及对策

南漪湖具有银鱼生长繁衍的良好生态条件，１９８１～１９８７年总产银鱼１１５０ｔ。１９８８年后由于过度捕捞，经济鱼类种类组成改变；加上多年旱灾低水位的影响，造成资源严重衰退。通过分析认为：合理调整经济鱼类种类组成，开展放流移植增殖，加强资源保护管理等将使银鱼年产量达到历史最高水平的２．６９倍。

A Preliminary Study on the Decline Causes of the Icefish Resource and the Countermeasures in Nanyi Lake

Nanyi Lake has the excellent ecological conditions suitable for icefish growth and reproduction.The total output of icefish from 1981￣1987 was 1 150 tons.Since 1988,over harvest,the alteration of the composition of economic fish species,drought and low level of water in long term had resulted in a heavy collapse of the icefish resource.Based on our analysis,we suggested that the composition of economic fish species be adjusted;the method of stocking and transplanting fries for increment be used the management of fish resource conservation be strengthened so that the annual yield may be increased to 2 69 time of the highest one in the record.