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四川多地高温天气持续 蚊子、鱼、鹌鹑都被热死了

2017-08-04 15:05:39   中国青年网

目前,高温天气正在全省多地持续。自七月下旬以来,川南泸州、宜宾持续高温,最高温度达到41.6℃。受此影响,蚊密度与往年同期相比略有下降,原来蚊子不喜高温,都被“热死”了。与此同时,省内的达州、巴中等地,也出现因为天气热导致动物大面积死亡的情况。

 泸州:蚊密度较去年同期下降

泸州市疾控心每年都对蚊类进行密度监测,目前泸州建成区共有20个监测点。据监测人员介绍,每年7月至8月为蚊密度高峰期,但今年蚊密度较去年同期有所降低。专家分析认为,近段时间川南一带蚊子减少跟天气有很大关系。“气温偏高加少雨的情况,打乱了蚊子的生长繁殖节奏,所以蚊子变少了。” 研究人员发现,“适合蚊类生存的温度在22℃-32℃之间”,当气温在25℃左右时,最适合蚊类繁殖,市民普遍感觉蚊子很多;当气温超过35℃时,蚊子卵、幼虫、蛹在水里就会停止发育,甚至大量死亡。而40℃以上的高温,对蚊子几乎是致命的。因此,七月下旬以来持续40℃左右的高温,“热死”了不少蚊子。

由于川南一带夏秋季气候特殊、水草丰茂,非常适宜蚊虫繁殖孳生。历年来的孳生地调查显示,蚊子繁殖的“温床”主要在城乡接合部、农村、养殖场,以及城市中水草比较茂盛的地方,比如公园、绿化带和居民小区等。泸州市疾控中心有关负责人表示,如果温度下降,雨水增多,蚊子的密度还会上升。

 达州:天热缺氧,近千斤鱼儿死亡

7月29日晚,达州市达川区大树镇的养殖户何学华家近千斤鱼儿死亡,后经过专家确认,因天气热,鱼儿养殖密度过大,缺氧出现翻塘。这对养鱼22年的何学华来说,还是第一次遇到鱼大量死亡的情况。鱼儿到底是怎么死的,何学华父子心里充满疑问。何学华介绍,鱼塘2.5亩左右,2017年正月投放鱼1000多尾,其中包括白鲢、鲤鱼、花鲢、鲫鱼等,平时喂养一天三次没有断过。“育苗密度相比往年高了一些,几乎翻倍,但是从池塘的体量算,感觉总体密度不算高,”何学华说。

在鱼儿死亡之后,达州市水产技术推广站工程师罗光兵到现场查看,解释了鱼儿死亡的原因是天太热,鱼儿缺氧导致翻塘。

罗光兵介绍,当日天气炎热,在久晴不雨的情况下,极易导致鱼塘缺氧从而出现翻塘现象。罗光兵表示,何学华的鱼塘面积小,鱼的负载力比较大,且增氧机也只有一个,供养量不足,加上水质也很差,导致翻塘。

  巴中:冷风机断电,2.6万只鹌鹑被热死

7月26日,巴中市恩阳区鱼溪镇一养殖场26000只鹌鹑因为电压不稳停电,冷风机无法给鹌鹑降温被热死,场主直接损失30万元。

“7月26日早晨,我就发现养殖场鹌鹑大面积死亡,”养殖场场主胡玉华说。

事发之后,胡玉华第一时间上报渔溪镇供电所、渔溪镇畜牧站及当地村干部,经清点,约26000只鹌鹑死亡。后经恩阳区疾控中心专家现场解剖,“未有疾病特征性病理变化”。随后,这些死亡的鹌鹑被统一掩埋。

胡玉华认为,鹌鹑被热死的可能性最大。7月25日晚上,养殖场电压不稳导致多次跳闸。养殖场内有冷风机一台,专供鹌鹑降温,当晚多次跳闸,冷风机无法给鹌鹑降温。

胡玉华称,26000只鹌鹑的死亡导致养殖场30万元损失。

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