新玩家汇娱乐

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鱼苗早期易生病害预防方法

放大字体  缩小字体 发布日期:2015-05-26  来源:中国农业新闻网  浏览次数:852815
内容摘要:  气泡病  病原:水中某种气体(氧气、氮气等)过饱和。越小的个体越敏感?! ≈⒆矗鹤畛醺械讲皇娣?,在水面作混乱无力游动,
   气泡病

农民信息网 www.fxnonstop.com   病原:水中某种气体(氧气、氮气等)过饱和。越小的个体越敏感。

  症状:最初感到不舒服,在水面作混乱无力游动,不久在体表及体内出现气泡,当气泡不大时,鱼苗还能反抗其浮力而向下游动,但身体已经失去平衡,时游时停,随着气泡的增大及体力的消耗,失去自由游动能力而浮在水面,不久即死。

  预防方法:主要是防止水体中气体过饱和。

 ?、僮⒁馑?,不要用含气泡的水(有气泡的水必须经过充分曝气),??鲅趸?。

新玩家汇娱乐 ?、诔刂懈持什挥?,不用未经发酵的有机肥。掌握好投饲量与施肥量,注意水质,不使浮游植物繁殖过多。

新玩家汇娱乐 ?、鬯虏灰嗖钐?。治疗方法:

新玩家汇娱乐 ?、俜⒉∈?,立即加注溶解气体在饱和度以下的清水,同时排除部分池水。

新玩家汇娱乐 ?、诿磕队?千克~6千克的食盐,向有气泡病病鱼的水面均匀泼洒,一般在数小时内便可见效果。

  跑马病

新玩家汇娱乐  病因:主要由于鱼苗下塘后,天气阴雨,水温偏低,池水清瘦,池水肥不起来,池中缺乏鱼苗的适口饵料。也有的因夏花培育池漏水,引起水质变瘦,加之投饵不及时。

新玩家汇娱乐  症状:鱼苗(种)成群结队,围绕池边逛游,形似"跑马",长时间不停,最终因体力消耗殆尽,而引起大批死亡。

  防治方法:

 ?、儆忝绶叛荒芄?,尤其是草、青鱼。鱼苗饲养10天后,应及时投喂适口饵料。

 ?、诜乐褂愠芈┧?,认真检查进水口。

新玩家汇娱乐 ?、鄯⒉∈?,立即用芦席或竹帘隔断鱼苗逛游路线,并同时投喂一些适口饵料以诱其摄食,可终止"跑马"。

新玩家汇娱乐 ?、芙幕ㄓ阒忠品诺揭雅嘤蟹岣桓∮紊锏挠愠刂?。⑤一般上面第3条效果不明显,可采用投喂面粉,或者用通威饲料的鱼种料的粉料,效果明显,且能解决根本问题。

新玩家汇娱乐  车轮虫、杯体虫、斜管虫

  病原:车轮虫、杯体虫、斜管虫

  症状:车轮虫等大量寄生鳃部时,引起鳃部肿胀,鳃部张开,鳃丝暗灰色,体色变黑,离群独游,不摄食,逐步消瘦。同时寄生虫不断在鳃上活动,破坏鳃丝的表皮细胞,刺激鳃细胞分泌过多的粘液,引起烂鳃,妨碍鱼的呼吸,从而影响鱼的正常代谢作用,严重时也可引起批量死亡。

  治疗方法:

 ?、偃仄萌髁蛩嵬土蛩嵫翘霞?5∶2),浓度:0.7毫克/升。

 ?、谟?ldquo;纤灭”(主要成份为青蒿末)全池泼洒,或定期在饲料中添加“纤灭”粉投喂,每千克体重0.3克~0.4克(按5%投饵量计,每千克饲料用本品6.0克~8.0克),连用5天~7天。

新玩家汇娱乐  指环虫、三代虫

新玩家汇娱乐  病原:指环虫、三代虫

新玩家汇娱乐  症状:大量寄生指环虫、三代虫时,病鱼鳃丝粘液增多,鳃丝全部或部分成苍白色,妨碍鱼的呼吸,有时可见大量虫体挤出鳃外。鳃部显著浮肿,鳃盖张开,病鱼游动缓慢,直至死亡。

  治疗方法:

  水温20℃~30℃时,用90%晶体敌百虫全池遍洒,每立方米池水用药0.2克~0.3克,效果较好。

  白点病(小瓜虫)

新玩家汇娱乐  病原:多子小瓜虫。

  症状:小瓜虫的幼虫浸入鱼体的皮肤或鳃丝组织后,吸取鱼体营养,引起组织分泌大量粘液。病鱼的体表肉眼可见一个个小白点,开始发病时,体表、鳍基部略见发红,病鱼呆滞于池底或堆积在鱼池的角落,继而白点出现,逐渐增多,严重时,体表形成一层白膜,皮肤发炎,拒食,多从鳍条边缘开始腐烂,最后导致死亡。

  预防方法:

 ?、傩」铣媸室说乃挛?5℃~25℃,<10℃和>28℃发育停止,28℃以上时幼虫极易死亡,因此升高水温可预防小瓜虫病。小瓜虫幼虫24小时找不到寄主即死亡,但目前已发现在28℃以上水温中有白点病发生。

新玩家汇娱乐 ?、谧龊糜愠丶坝闾逑?。

新玩家汇娱乐 ?、鄯乐钩厮任圩?,此为白点病引发的重要原因。治疗方法:

 ?、儆?ldquo;纤灭”(主要成份为青蒿末)全池泼洒,或定期在饲料中添加“纤灭”粉投喂,每千克体重0.3克~0.4克(按5%投饵量计,每千克饲料用本品6.0克~8.0克),连用5天~7天。

 ?、谟眉兹?0毫克~80毫克/升浸泡病鱼10分钟~18分钟(视水温的高低灵活掌握),隔天再浸泡1次。此法只在发病初期疗效显著,如检查发现晚了,病鱼身上布满小白点,即使连续用药,苗种的损失也很大。

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