“京津冀最美湿地”首次发布捕捞季渔获调查 验证“生态丰收”|99re在线播放
中新网衡水11月21日电 (裴国荣 崔志平 张凯)“京津冀最美湿地”河北衡水湖21日首次发布捕捞季渔获情况专项调查报告。据统计,今年开湖捕捞季期间,渔获品种结构发生明显变化,验证“生态丰收”。
此次调查由衡水滨湖新区管理委员会联合衡水学院生命科学学院副教授林红军团队实施,也是衡水湖首次进行此类详细调查。
今年衡水湖开湖捕捞季(9月12日至10月31日)渔获总量超536吨,渔获品种结构发生明显变化,鳙鱼(即花鲢)取代白鲢成为绝对优势种,优质渔获带动渔民收入稳中有升。
“虽然总重量与往年持平,但大规格鱼占比高,实际捕捞尾数减少,说明渔业资源处于健康循环状态。”林红军说,今年湖区共捕获24种鱼类及水生生物,其中花鲢占比超六成,最大个体达20斤,白鲢、鲤鱼、青虾等经济性渔获也形成稳定产出规模。

中国水产科学研究院淡水渔业研究中心研究员徐东坡称,氮、磷是藻类生长的关键因子,可直接影响水体富营养化程度。白鲢与花鲢可直接滤食浮游藻类,同时能将水体中的氮、磷等营养物质转化为自身组织并储存。
“当白鲢与花鲢超过生长拐点,摄食藻类的效率降低,死亡后其吸收的氮、磷等也会再次进入水体成为藻类暴发的‘燃料’。”徐东坡表示,衡水湖开湖捕捞达到生长拐点的大规格白鲢与花鲢等水产,可有效降低水体富营养化风险,而丰富的渔获则是生态保护的成果体现,二者相辅相成。
衡水湖水质常年稳定在地表水Ⅲ类标准,为鱼类生长提供了优良环境。根据调查报告,林红军建议,明年应加大增殖放流的投放量和投放品种,以丰富湖区内鱼类生物多样性,持续实现经济效益与生态环境保护双赢。
素有“京津冀最美湿地”之称的衡水湖,是华北平原保持沼泽、水域、滩涂、草甸和林地等完整湿地生态系统的国家级自然保护区,已观测记录到鸟类336种、植物594种、鱼类45种。其中,世界极危物种青头潜鸭的数量逐年递增。(完)
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