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投市內興里河川死魚 環保局初判為天熱溶氧不足所致

Posted On By 廖 宥婷

【記者廖宥婷/南投報導】

近日天氣炎熱高溫,縣府環保局於日前接獲南投市內興里里長通報,於南投市南營路97巷旁內轆排水支線有河川死魚,該局陳情中心人員受理後第一時間派員前往現場勘查並進行簡易水質測試,並同步啟動死魚清理緊急應變,經現場採樣檢測,現場排水水質溶氧不到1mg/L,氰化物簡易試劑檢測結果無反應,初步判定疑似溶氧不足。

環保局長方信雄指出,氣象局預報顯示南投縣氣溫屢達攝氏38~39度,對於各類動物都是一大考驗。該局於接獲水體緊急事件時,除派人前往了解外,也會對水體水質進行快篩,以釐清水體是否遭受污染,惟突發性污染因水源常因持續注入沖淡稀釋而難以追查,仍須靠民眾公德心及守望相助得以防止。

環保局表示,該局於7月15日上午接獲通報時同步啟動死魚清理緊急應變,立即指派委辦「清淨河面計畫」人員到場進行清理。計畫人員於通報後2小時內抵達現場,經勘查現場死魚分布情況與現場地形後,依過往執行經驗,先行於主要分布河段下游佈設簡易攔截網,以阻斷大量死魚持續漂向下游,並開始進行攔截網上游河段之死魚清理。該段內轆排水支線屬水泥3面光排水斷面,其中一邊為傾斜護岸並恰有階梯,方便清理人員下至河道內。

 該局人員於清理死魚過程中,發現本次死魚幾乎為吳郭魚,但除了大魚外也發現不少中小型體型死魚,甚至有耐污性高之琵琶鼠,在泥灘地上也發現有1公分左右死魚苗。另查該排水上游集水區僅有住宅區、零星商店及農田灌溉回歸水,尚無發現水污染源工廠,且訪談附近居民皆表示該排水未曾發生此類死魚事件,本次死魚僅主要分布於南營路97巷某版橋向下游約200公尺。綜合推論死魚原因不排除有人為瞬間排入藥劑可能,故該局於清理時一併蒐集死魚樣本送至行政院農業委員會農業藥物毒物試驗所,檢驗魚體是否有殘毒俾利後續分析死魚原因。經該局「清淨河面計畫」人員於攝氏38~39度高溫烈日下清除魚體,於當日下午6點前完成主要河段魚體撈除工作,總計共清除2,190公斤死魚,即時讓下班返家的沿岸居民,免於承受魚體腐爛發臭的影響。而少部分已漂流至下游段之死魚,也責成「清淨河面計畫」人員於隔日再前往清理。

近日極端氣象趨於頻繁,雨水少、氣溫高,當魚隻因氣溫高、河水溶氧低已感覺緊迫,若此時有額外藥劑排入水中,魚隻將難以承受而死亡。環保局提醒民眾,如發現魚體大量缺氧死亡案件,也請民眾毋須恐慌,可撥打環保局公害陳情專線(049-2234685),該局將於第一時間派人前往了解狀況並處理。

廖 宥婷
yuio804325@gmail.com

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