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The protection of aquatic habitat from damage and understanding of both sensitivity of aquatic or... more The protection of aquatic habitat from damage and understanding of both sensitivity of aquatic organisms to contaminant and ecological effects. Mekong River quality criteria of aquatic life for metals are largely driven by the extremely sensitive small organisms toxicity which are the Mekong native species. In this study we assessed the toxicity of Copper in the Mekong river water with Chironomids Species (Chironomus javanus) and Nile tilapia (Oreochromis niloticus). Acute toxicity effect of copper concentration to freshwater animals occur after the exposure at tested with Mekong water was studied by observing mortality and LC50 over a 24 hours test period. The LC50 with 95% confidence limit of the 96-hours toxicity was performed to contrast responses of Chironomids Species (C. javanus) and Nile tilapia (O. niloticus). The result showed that the LC50 with 95% confidence limit obtained were 742 μg/L in Chironomids Species (C. javanus) and 853μg/L in Nile tilapia (O. niloticus). Coppe...
Copper is one of the most toxic metals to aquatic organism and ecosystem and it does not break do... more Copper is one of the most toxic metals to aquatic organism and ecosystem and it does not break down in the environment because it can accumulate in to plant and animals via food web. Focus on the need to identify suitable freshwater organism to assess the toxicity of copper in tropical reigns, but there is limited toxicity data for tropical freshwater organism, and there have been a call for further research and development in the care of tropical freshwater ecotoxicology. The LC50 results expressed as 95% confidence limit obtained at 48 hr in tap water using the tropical test species Moina (Moina macrocopa), Chironomid (Chironomus javanus), Grass Carp (Ctenopharyngodon idella) and Nile tilapia (Oreochromis niloticus) were 12μg/L, 16,399μg/L, 118μg/L and 1,383 μg/L, respectively. This gave the following order of toxicity of copper in tap water: Moina > Grass Carp > Nile tilapia > Chironomid. Exposure of the test species to this series of laboratory experiments has provided ...
The aquatic resources of the Mekong River are importance to supporting the livelihoods of a large... more The aquatic resources of the Mekong River are importance to supporting the livelihoods of a large percentage of 60 million who live along the Lower Mekong Basin. Ecotoxicology of copper on tropical freshwater biota was studied using field-collected water from 2 local sites along Lower Mekong Basin in Cambodia, which had two different water dissolved organic carbon (5.74 mg/L DOC and 1.12 mg/L DOC). In this study, US EPA method was used for the acute toxicity with two different water DOC on Chironomid (Chironomus javanus) and fish Nile tilapia (Oreochromis niloticus) to modify the effecting of dissolved organic carbon (DOC) on copper toxicity. The result showed that the LC50 with 95% confidence limit obtained were 742 μg/L in Chironomid and 853μg/L in Nile tilapia with high (5.74 mg/L DOC), respectively. In term of low (1.12 mg/L DOC) test water, the LC50 with 95% confidence limit obtained were 707μg/L in Chironomid and 397μg/L in Nile tilapia, respectively. The mortalities for both ...
The Mekong River is one of the world’s greatest river systems and sustains human life and ecosyst... more The Mekong River is one of the world’s greatest river systems and sustains human life and ecosystems. The livelihoods of 60 million people who live along the Lower Mekong Basin (LMB) rely on both the economic resource and the ecological health of the river. In this study, US EPA method was used for the acute toxicity with different water dissolved organic carbon (DOC) of Mekong River in Cambodia on Chironomus javanus and fish Nile tilapia (O. niloticus) to modify the effecting of DOC on copper toxicity. Both C. javanus and Nile tilapia were significantly less sensitive to copper in water high DOC (5.74 mg/L DOC), compared to water low DOC (1.12 mg/L DOC) exposures. The effect of DOC, as humic acid source on the acute toxicity of copper (Cu) to C. javanus and Nile tilapia also was investigated. The mortalities for both species increase with increasing copper concentration, but LC50 value decreased as more toxic on Nile tilapia and C. javanus. This gave an order of toxicity of copper ...
Flood is regarded as the most serious natural disaster that affected the economy of Cambodia. As ... more Flood is regarded as the most serious natural disaster that affected the economy of Cambodia. As the consequence, flooding has caused the loss of many lives, and has addressed impacts on social welfare and damaged the public and household properties. Livestock and crops were also destroyed. It has caused not only on the economic impact, but also on social and environmental problems of the nation. Seeing this serious problem which is an obstacle for the development of Cambodia, this study have been conducted with� three� main� objectives� are� (1)� to� identify� the� extent� of� flood's� impact� on� rice� yields� of� farmers, (2) to assess the economic impact of rice production, and (3) to explore the farmer's� adaptation� capacity� on� rice� pattern� to� the� flood.� To� achieve� those� objectives,� structured questionnaires were used with 96 who participated in the interview. The Study showed that the major flooding event in the last twenty years, worst flood in history in ...
The protection of aquatic habitat from damage and understanding of both sensitivity of aquatic or... more The protection of aquatic habitat from damage and understanding of both sensitivity of aquatic organisms to contaminant and ecological effects. Mekong River quality criteria of aquatic life for metals are largely driven by the extremely sensitive small organisms toxicity which are the Mekong native species. In this study we assessed the toxicity of Copper in the Mekong river water with Chironomids Species (Chironomus javanus) and Nile tilapia (Oreochromis niloticus). Acute toxicity effect of copper concentration to freshwater animals occur after the exposure at tested with Mekong water was studied by observing mortality and LC50 over a 24 hours test period. The LC50 with 95% confidence limit of the 96-hours toxicity was performed to contrast responses of Chironomids Species (C. javanus) and Nile tilapia (O. niloticus). The result showed that the LC50 with 95% confidence limit obtained were 742 μg/L in Chironomids Species (C. javanus) and 853μg/L in Nile tilapia (O. niloticus). Coppe...
Copper is one of the most toxic metals to aquatic organism and ecosystem and it does not break do... more Copper is one of the most toxic metals to aquatic organism and ecosystem and it does not break down in the environment because it can accumulate in to plant and animals via food web. Focus on the need to identify suitable freshwater organism to assess the toxicity of copper in tropical reigns, but there is limited toxicity data for tropical freshwater organism, and there have been a call for further research and development in the care of tropical freshwater ecotoxicology. The LC50 results expressed as 95% confidence limit obtained at 48 hr in tap water using the tropical test species Moina (Moina macrocopa), Chironomid (Chironomus javanus), Grass Carp (Ctenopharyngodon idella) and Nile tilapia (Oreochromis niloticus) were 12μg/L, 16,399μg/L, 118μg/L and 1,383 μg/L, respectively. This gave the following order of toxicity of copper in tap water: Moina > Grass Carp > Nile tilapia > Chironomid. Exposure of the test species to this series of laboratory experiments has provided ...
The aquatic resources of the Mekong River are importance to supporting the livelihoods of a large... more The aquatic resources of the Mekong River are importance to supporting the livelihoods of a large percentage of 60 million who live along the Lower Mekong Basin. Ecotoxicology of copper on tropical freshwater biota was studied using field-collected water from 2 local sites along Lower Mekong Basin in Cambodia, which had two different water dissolved organic carbon (5.74 mg/L DOC and 1.12 mg/L DOC). In this study, US EPA method was used for the acute toxicity with two different water DOC on Chironomid (Chironomus javanus) and fish Nile tilapia (Oreochromis niloticus) to modify the effecting of dissolved organic carbon (DOC) on copper toxicity. The result showed that the LC50 with 95% confidence limit obtained were 742 μg/L in Chironomid and 853μg/L in Nile tilapia with high (5.74 mg/L DOC), respectively. In term of low (1.12 mg/L DOC) test water, the LC50 with 95% confidence limit obtained were 707μg/L in Chironomid and 397μg/L in Nile tilapia, respectively. The mortalities for both ...
The Mekong River is one of the world’s greatest river systems and sustains human life and ecosyst... more The Mekong River is one of the world’s greatest river systems and sustains human life and ecosystems. The livelihoods of 60 million people who live along the Lower Mekong Basin (LMB) rely on both the economic resource and the ecological health of the river. In this study, US EPA method was used for the acute toxicity with different water dissolved organic carbon (DOC) of Mekong River in Cambodia on Chironomus javanus and fish Nile tilapia (O. niloticus) to modify the effecting of DOC on copper toxicity. Both C. javanus and Nile tilapia were significantly less sensitive to copper in water high DOC (5.74 mg/L DOC), compared to water low DOC (1.12 mg/L DOC) exposures. The effect of DOC, as humic acid source on the acute toxicity of copper (Cu) to C. javanus and Nile tilapia also was investigated. The mortalities for both species increase with increasing copper concentration, but LC50 value decreased as more toxic on Nile tilapia and C. javanus. This gave an order of toxicity of copper ...
Flood is regarded as the most serious natural disaster that affected the economy of Cambodia. As ... more Flood is regarded as the most serious natural disaster that affected the economy of Cambodia. As the consequence, flooding has caused the loss of many lives, and has addressed impacts on social welfare and damaged the public and household properties. Livestock and crops were also destroyed. It has caused not only on the economic impact, but also on social and environmental problems of the nation. Seeing this serious problem which is an obstacle for the development of Cambodia, this study have been conducted with� three� main� objectives� are� (1)� to� identify� the� extent� of� flood's� impact� on� rice� yields� of� farmers, (2) to assess the economic impact of rice production, and (3) to explore the farmer's� adaptation� capacity� on� rice� pattern� to� the� flood.� To� achieve� those� objectives,� structured questionnaires were used with 96 who participated in the interview. The Study showed that the major flooding event in the last twenty years, worst flood in history in ...