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頁籤選單縮合
題 名 | 鹽度對大鱗鮻低溶氧窒息死亡之影響=Effects of Salinity on Suffocated Dissolved Oxygen Level of Large-scaled Mullet, Liza macrolepis |
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作 者 | 陳志遠; 王天元; 陳孟仙; | 書刊名 | 環境保護 |
卷 期 | 26:2 2003.12[民92.12] |
頁 次 | 頁177-190 |
分類號 | 361.52 |
關鍵詞 | 鹽度; 溶氧窒息死亡濃度; 溶氧窒息死亡時間; 大鱗鮻; 愛河; LC叙; LT叙; Salinity; Large-scaled mullet; Love river; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究針對大鱗鮻的稚魚,進行不同固定鹽度(10、20及30‰)與急遽鹽度改變下(30→20‰)之48小時急速低溶氧窒息死亡實驗,評估溫度23°C下之半致死時間(LT50)與半致死濃度(48h LC50),以了解鹽度是否影響魚類低溶氧窒息死亡。 結果顯示鹽度30‰下大鱗鮻稚魚的低落氧耐受性較鹽度10‰和20‰下為低,同時在模擬污水閘門瞬間開啟時急篆鹽度由30‰改變為20‰(30→20‰)的實驗中,其低溶氧耐受性更較固定30‰鹽度之實驗結果為低。不同固定鹽度試驗下的LT50呈現明顯差異,在23°C,7%飽和溶氧濃度下,鹽度10、20及30‰下對平均LT50分別為290、246及20分鐘,急遽鹽度(30→20‰)改變下則僅有8分鐘。除此之外,這些實驗組的LC50亦有差異,鹽度10、20、30及30→20‰下的48h LC50分別為8.1、8.6、11.5及13.9%飽和溶氧,其絕對溶氧值在23°蝦分別為0.63、0.63、0.80及1.02 mg/l。本研究結果證實鹽度對大鱗鮻稚魚的低落氧窒息死亡有顯著的影響,尤其是鹽度急遽改變時,對魚類的活存威脅最大,因此建議以截流方式進行河川整治時,對污水閘門的開啟時機應有相關河川水質管理的配套措施,以減少魚類遭受低落溶氧以鹽度遽變雙重的致死壓力,達保育魚類族群的目的。 |
英文摘要 | This study aims to investigate the salinity effect on the survival of large-scaled mullet, Liza macrolepis, exposed to low DO concentrations. Forty-eight hours suffocated low DO experiments were conducted in fixed salinities of 10, 20 and 30‰, as well as rapid salinity drop (30→20‰). The median lethal times (LT50) and the 48 hours median lethal concentrations (48h LC50)at 23°C were evaluated. The results showed that salinity makes difference to the survival of experimental fish at suffocated DO condition. The suffocated lethal DO concentrations in 30‰ were higher than those in 10 and 20‰ experiments, which means that the large-scaled mullet in water of 30‰ were less tolerant to anoxic condition than those of 10 and 20‰, whereas the experiments mimic the sudden opening of the sewage interceptor (30→20‰) obtained an even lower lethal DO concentration than that of 30‰ experiment. The LT50s kept in 7% saturated dissolved oxygen with salinity of 10, 20 and 30‰ were 290, 246 and 20 minutes respectively, whereas in 30→20‰ experiment it was only 8 minutes. The 48 h LC50s were also significantly different among the experiments. In the salinity of 10, 20, 30 and 30→20‰, the 48 h LC50 were 8.1%, 8.6%, 11.5% and 13.9% saturated dissolved oxygen, respectively, which transformed into the absolute DO concentrations at 23°C were 0.63, 0.63, 0.80 and 1.02 mg/l, respectively. |
本系統中英文摘要資訊取自各篇刊載內容。