养殖难，螃蟹养殖更难，近期螃蟹池塘用药基本己经停止，大多数渔药店里库存药都己退回厂里，但这两天我在苏南发现一个现像，苏北有沒有还不知道，就是这两天去专卖店测水的农户多了，配的药也挺多的，据说近期环爪多，测一下水说亚硝酸盐高引起的。
今有一农户到专卖店测了一下水，说亚硝高了，33亩地配了3150元的药，养殖户是花钱买个心里安慰，我不从亚硝危害讲，我光从配药量上问一下配药的技术员，农户的钱真的这么好骗？你挣这钱不心虚？平均每亩接近100元了，你是怎好意思配出来的？
先说说亚硝酸盐偏高的问题，亚硝酸盐是由于残饵与水生动物粪便残存在水下，由于适合的水温引起池塘底部氨氮偏高，只有当氨氮，亚硝同时偏高才会引起池塘中硫化氢过高，只有这样才会引起螃蟹急性中毒，哪么也就是说现在的螃蟹环爪中毒必须有三大因素:
一、残饵与动物粪便；
二、温度；
三、氨氮，亚硝高。
这三点缺一不可，其它我不说，光说水温，十几度以下的水温能与残饵及粪便发酵产生有毒有害气体吗？当然不会。
当然亚硝酸盐会由于水体中某个物质引起偏高，但光亚硝高蟹不会中毒，螃蟹只会食欲不强，行动迟缓，亚硝酸盐最好的降减剂是硫代硫酸钠。
回过头来我们再来说说环爪，螃蟹己经生殖洄游了，不伦体质好坏，时间一到，螃蟹就会沿池塘四周顺一个方向爬行，24小时从不间断，这就是螃蟹在马拉松比赛，前期体弱的，生病的都会在这场马拉松比赛中越来越弱，消耗体力的螃蟹只能停下来慢慢等死，由于水温底，死亡时间就相对来说长一点，这就是我为何一直要求大家后期一定要你定期泼洒Vc与葡萄糖的原因。
所以近期环爪不是亚硝高引起的，而是螃蟹洄游后在自然淘汰。
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