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夏季水产养殖管理技术

放大字体  缩小字体 发布日期:2015-04-11  来源:农民日报  浏览次数:852818
内容摘要:  夏季天气炎热,水温高,鱼类生长旺盛,水的浓度大,鱼类易感染疾病。高温季节,加强管理显得尤为重要?! ∫?、调节好水质 
   夏季天气炎热,水温高,鱼类生长旺盛,水的浓度大,鱼类易感染疾病。高温季节,加强管理显得尤为重要。

农民信息网 www.qyemcl.cn   一、调节好水质

  1.将池水加至最高水位。随着蒸发、渗漏要及时补注新水,一般每7-10天注水一次,每次10-15厘米。如果水源不足应在保证水色和透明度的前提下减少投饵和施肥量。

  2.池塘施肥要少量多次,应保持水色呈红褐色、褐绿色、褐青色(墨绿色)和绿色,而且水的颜色要"活"(颜色日变化明显);透明度控制在20-30厘米;在水色很浓的情况下,可以配合防病定期使用漂白粉或甲醛,降低浮游植物的生物量(施药时注意溶氧的变化)。在高度密养的情况下一般水中含氮量高,可主施磷肥,不施或少施氮肥。

  3.调节池水的酸碱度使pH值保持在7.5-8.5间??擅扛?5-20天施次一生石灰。每亩用量为20-25公斤,化成石灰乳后全池泼洒。以改良水质,沉淀水中有机物,降低池水有机物耗氧量,促进浮游植物生长。

  4.合理配置、使用增氧机,根据设计产量5-8亩配备一台叶轮式增氧机。既能调节水质,又可增氧防止鱼类浮头。增氧机的使用应按照水中溶氧变化规律和增氧机的作用,科学的确定开机时间和机器的运转时间。要坚持晴天中午开,阴天清晨开,傍晚不开,浮头以前开,连绵阴雨半夜开的原则;运转时间要根据天气、水质、鱼类的浮头情况和增氧机负荷面积等情况确定开机时间的长短。

  二、加强投饵管理

  投饵管理要实行"四定"的原则,即定时、定位、定质、定量。其中投饵量要根据天气、水质和鱼吃食情况灵活掌握。一般天气晴朗饲料可多投,阴雨天可少投,天气闷热雷雨之前应停止投饵。水色好,水质肥爽,可正常投饵,水色淡可增加投饵量,水色过浓则应减少投饵量并应及时注入新水。鱼类争食激烈可正常投饵,上浮鱼群减小,争食不激烈时,可减少投饵量,并应查找原因;当鱼病治疗期间投饵量应适当控制。

  三、药物预防

  1.每半月使用一次漂白粉,预防细菌性鱼病,全池泼洒使用池水成1ppm。

  2.每月用漂白粉消毒食场,每日一次,每个投饵点用量250克,用法为每天下午2:00-3:00喂前,先将漂白粉溶解后泼洒食场周围然后喂鱼??闪?-4天。

  3.进入七月后每十天,在食场挂袋一次,利用鱼类到食场吃食的机会来回接触所挂袋中溶出的药物达到杀灭鱼体上的寄生虫。每次连用3-4天,每天换药一次。药物可用硫酸铜、硫酸亚铁,用量每天各100克和40克和敌百虫每天用量100克。两种药物分开时间使用。每个食场挂4-6只袋。

  4.内服药饵,主要用鱼服宁、鱼血散等成药添加到饲料中制成药饵,用量可按预防的常规用量,连喂3天,每月1-2次。

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