Search

Search Results

• 1. [Article] Water Resource Exploitation of the Mekong River Basin and the Influences on the Inland Fisheries of Cambodia

  Inland fisheries in the Tonlesap Lake of Cambodia play an essential role in providing with protein and cash income to the poor around the lake. However, the fisheries face a crisis of fish resource depletion ...

  Citation × Citation Citation Abstract Copy Title: Water Resource Exploitation of the Mekong River Basin and the Influences on the Inland Fisheries of Cambodia Author: Huang, Wenfeng, Tanji, Hajime, Kobayashi, Shintaro, Tada, Minoru Inland fisheries in the Tonlesap Lake of Cambodia play an essential role in providing with protein and cash income to the poor around the lake. However, the fisheries face a crisis of fish resource depletion due to excessive catch, water pollution and decline in the water level of the Lake. We analyzed the relation of fish catch amounts with the maximum water level in the rainy season and the fish catch in the past, and found that 1% decrease in the water level reduces the catch amounts by 1.25%.What water level can be predicted for the future? To answer this question, we made two models; the one is the water demand-supply model by industry and the other is the water cycle model for the Mekong basin. Depending on various scenarios on the economic development and hydropower dam construction, the reduction in the maximum water level of the Lake would be around 4%, which would lead to a decline in the catch amounts by 5%. In addition to these water quantity issues, we have to consider the inflow of nutrition for which dam constructions would prevent, as well as water pollution of the lake and the excessive catch. Therefore, our estimation on the amount of fish catch reduction in the future is regarded as the conservative minimum one, and the actual catch reduction would be more severe and harmful for livelihoods of the people around the Lake. Title: Water Resource Exploitation of the Mekong River Basin and the Influences on the Inland Fisheries of Cambodia Author: Huang, Wenfeng, Tanji, Hajime, Kobayashi, Shintaro, Tada, Minoru Inland fisheries in the Tonlesap Lake of Cambodia play an essential role in providing with protein and cash income to the poor around the lake. However, the fisheries face a crisis of fish resource depletion due to excessive catch, water pollution and decline in the water level of the Lake. We analyzed the relation of fish catch amounts with the maximum water level in the rainy season and the fish catch in the past, and found that 1% decrease in the water level reduces the catch amounts by 1.25%.What water level can be predicted for the future? To answer this question, we made two models; the one is the water demand-supply model by industry and the other is the water cycle model for the Mekong basin. Depending on various scenarios on the economic development and hydropower dam construction, the reduction in the maximum water level of the Lake would be around 4%, which would lead to a decline in the catch amounts by 5%. In addition to these water quantity issues, we have to consider the inflow of nutrition for which dam constructions would prevent, as well as water pollution of the lake and the excessive catch. Therefore, our estimation on the amount of fish catch reduction in the future is regarded as the conservative minimum one, and the actual catch reduction would be more severe and harmful for livelihoods of the people around the Lake. Close

• 2. [Article] Power, Fish, and the Greenhouse on the Columbia River

  The Columbia River in the Pacific Northwest region of the U.S. is home to the greatest hydroelectric system in the world. Its dams provide 75 percent of the power needs of nearly 10 million people. But ...

  Citation × Citation Citation Abstract Copy Title: Power, Fish, and the Greenhouse on the Columbia River Author: Buchanan, Shepard C. Year: 2001 The Columbia River in the Pacific Northwest region of the U.S. is home to the greatest hydroelectric system in the world. Its dams provide 75 percent of the power needs of nearly 10 million people. But the dams also create numerous obstacles to the survival of what was once the world’s greatest salmon fishery. The region spends over $500 million annually to try to restore the fishery and ensure its future survival. However, the changes in river operations implemented to meet fish needs make it much more difficult to meet other environmental goals, such as the development of renewable electric power resources. Renewable resources would help to alleviate the risks associated with global warming. This paper demonstrates an unfortunate irony: that the renewable resources advocated by environmental interests are incompatible with a hydro system that is operated for fish. Such resources could add billions of dollars to the costs of electric power, while providing minimal environmental benefits. Saving the fish and reducing greenhouse gases are two environmental goals that do not appear to be compatible. Title: Power, Fish, and the Greenhouse on the Columbia River Author: Buchanan, Shepard C. Year: 2001 The Columbia River in the Pacific Northwest region of the U.S. is home to the greatest hydroelectric system in the world. Its dams provide 75 percent of the power needs of nearly 10 million people. But the dams also create numerous obstacles to the survival of what was once the world’s greatest salmon fishery. The region spends over $500 million annually to try to restore the fishery and ensure its future survival. However, the changes in river operations implemented to meet fish needs make it much more difficult to meet other environmental goals, such as the development of renewable electric power resources. Renewable resources would help to alleviate the risks associated with global warming. This paper demonstrates an unfortunate irony: that the renewable resources advocated by environmental interests are incompatible with a hydro system that is operated for fish. Such resources could add billions of dollars to the costs of electric power, while providing minimal environmental benefits. Saving the fish and reducing greenhouse gases are two environmental goals that do not appear to be compatible. Close

• 3. [Article] The History of Development of Fisheries Management and Co- Management Studies in Vietnam

  No poster available.

  Citation × Citation Citation Abstract Copy Title: The History of Development of Fisheries Management and Co- Management Studies in Vietnam Author: Ha, Xuan Thong No poster available. Title: The History of Development of Fisheries Management and Co- Management Studies in Vietnam Author: Ha, Xuan Thong No poster available. Close

• 4. [Article] Livelihood Strategies of African Floodplain Fishers Under Hydro- Climatic Changes

  No poster available.

  Citation × Citation Citation Abstract Copy Title: Livelihood Strategies of African Floodplain Fishers Under Hydro- Climatic Changes Author: Sinaba, Famory, Lemoalle, Jacques, Kodio, Amaga, Pierre, Morand No poster available. Title: Livelihood Strategies of African Floodplain Fishers Under Hydro- Climatic Changes Author: Sinaba, Famory, Lemoalle, Jacques, Kodio, Amaga, Pierre, Morand No poster available. Close

• 5. [Article] Biodiversity of river Ganga (India): An Environmental Economist Perspective

  Abstract only.

  Citation × Citation Citation Abstract Copy Title: Biodiversity of river Ganga (India): An Environmental Economist Perspective Author: Shrivastava, Rama Shanker Abstract only. Title: Biodiversity of river Ganga (India): An Environmental Economist Perspective Author: Shrivastava, Rama Shanker Abstract only. Close

• 6. [Article] The Current State of the Clam, Galatea paradoxa, Fishery at the Lower Volta River, Ghana

  The clam, Galatea paradoxa has for decades been an important source of protein to the riparian communities of the lower Volta River and provides employment to about 2000 people, especially women. The fishing ...

  Citation × Citation Citation Abstract Copy Title: The Current State of the Clam, Galatea paradoxa, Fishery at the Lower Volta River, Ghana Author: Agbeko, N.A., Obirikorang, K.A., Adjei-Boateng, D., Amisah, S., Agbo, N.W. The clam, Galatea paradoxa has for decades been an important source of protein to the riparian communities of the lower Volta River and provides employment to about 2000 people, especially women. The fishing grounds have dwindled from 100 km from the pre-dam era to a narrow stretch of 10 km as a result of the development of sand bars at the estuary. This study was conducted to ascertain the socio-economic importance of the clam fishery to the people of the lower Volta, Ghana. The research found out that there were 251 fishing canoes and 503 fishers engaged in the clam fishery. The average daily catch per fishing canoe was 130 kg of clams, with an annual harvest of 7700 tonnes worth 4,620,408 Ghana Cedis. Commercial extinction of G. paradoxa is imminent in the lower Volta as a result of habitat alteration and overfishing. There is the need to put in place a sustainable harvesting measure that will target medium to large size clams against the current situation where the catch is dominated by smaller clams. It is recommended that a minimum landing size of 50 mm should be imposed. This should be done in consultation with the chiefs and traditional authorities in the communities which have managed the fishery to date. The marketing of clams below the 50 mm shell length limit should be abolished and enforced by the traditional authorities. Secondly, the farming of smaller clams, which is a traditional activity in the estuary, should be encouraged so that fishers who harvest undersize clams can seed them onto their culture plots. Title: The Current State of the Clam, Galatea paradoxa, Fishery at the Lower Volta River, Ghana Author: Agbeko, N.A., Obirikorang, K.A., Adjei-Boateng, D., Amisah, S., Agbo, N.W. The clam, Galatea paradoxa has for decades been an important source of protein to the riparian communities of the lower Volta River and provides employment to about 2000 people, especially women. The fishing grounds have dwindled from 100 km from the pre-dam era to a narrow stretch of 10 km as a result of the development of sand bars at the estuary. This study was conducted to ascertain the socio-economic importance of the clam fishery to the people of the lower Volta, Ghana. The research found out that there were 251 fishing canoes and 503 fishers engaged in the clam fishery. The average daily catch per fishing canoe was 130 kg of clams, with an annual harvest of 7700 tonnes worth 4,620,408 Ghana Cedis. Commercial extinction of G. paradoxa is imminent in the lower Volta as a result of habitat alteration and overfishing. There is the need to put in place a sustainable harvesting measure that will target medium to large size clams against the current situation where the catch is dominated by smaller clams. It is recommended that a minimum landing size of 50 mm should be imposed. This should be done in consultation with the chiefs and traditional authorities in the communities which have managed the fishery to date. The marketing of clams below the 50 mm shell length limit should be abolished and enforced by the traditional authorities. Secondly, the farming of smaller clams, which is a traditional activity in the estuary, should be encouraged so that fishers who harvest undersize clams can seed them onto their culture plots. Close