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中新网玉溪8月7日电 (李丹)“最近在星云湖频频看到星云白鱼现身,说明20多年的土著鱼类保护工作初显成效。”7日,云南省玉溪市江川区畜牧水产站站长张四春如是说。
地处滇中江川的星云湖,是云南高原湖泊之一。据记载,该湖共有15种土著鱼类,其中星云白鱼仅分布于此,产量曾占星云湖渔产总量的20%。

张四春介绍,星云白鱼最显著的特征是体型细长侧扁,体呈银白色,背部呈青灰色,鳞片细小。20世纪末,因水质恶化、过度捕捞、外来物种入侵等多种因素,导致星云白鱼锐减,一度难觅踪迹。2004年,江川启动星云白鱼专项保护工程。
“2005年,有人在跳鱼沟发现星云白鱼踪迹,我请了一位经验丰富的老渔民开始蹲守捕捞,两个多月共捕获800多条母本。”张四春介绍,依托母本,两年后,他和团队攻克难关,实现星云白鱼人工驯养繁殖;2009年又成功繁育出子二代鱼苗,实现全人工繁殖。此后,累计向星云湖放流星云白鱼33.6万尾,为物种延续播撒下希望。
张四春介绍,星云白鱼对产卵的环境要求极高,4至10月为产卵期,端午节前后是高峰期,一条雌鱼一年可分批产约6000粒卵,鱼卵附着在河中砾石或水生植物上。
江川区星云湖管理局副局长杨钰介绍,近期多种鱼迎来产卵季,为守护繁殖关键期,星云湖已于8月1日起进入封湖禁渔期。
近年来,江川区持续推进星云湖湖外水资源循环利用综合性工程,创新推广生态种养模式,科学划定禁养区与限养区,持续补植和修复湿地原生植物群落,不断提升湖泊自净能力,为鱼类生存繁衍提供了优良的水生态环境。下一步,将继续完善生态调控机制,优化鱼类增殖放流、栖息地修复等保护措施,让生态保护成果惠及子孙后代。(完)
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