Figure 20 - uploaded by Kent Hortle
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The main migration 'systems' of freshwater fishes of the Mekong mainstream in the LMB Based on Poulsen et al. (2002). Many fish migrate between productive floodplains and rivers and along the mainstream; see text for explanation.
Contexts in source publication
Context 1
... the LMB, three migration 'systems' have been proposed to describe general patterns of migration for large numbers of fish of many species along and near the mainstream ( Figure 20). The Lower Mekong Migration System extends along the mainstream from the delta to Khone Falls and includes the Tonle Sap and the lower reaches of Mekong tributaries in Cambodia. Many fish within this system feed and grow during the wet season within the floodplains of the Tonle Sap and delta, the 'fish factory' of this system, migrating off flooded areas as water levels fall and then swimming to dry season refuges, particularly deep pools along the Mekong in upper Cambodia. At the beginning of the wet season, many fish spawn in upper Cambodia with their larvae subsequently drifting downstream to productive floodplains; others move onto floodplains to spawn, and many adult fish migrate downstream to access productive ...
Context 2
... the LMB, three migration 'systems' have been proposed to describe general patterns of migration for large numbers of fish of many species along and near the mainstream ( Figure 20). The Lower Mekong Migration System extends along the mainstream from the delta to Khone Falls and includes the Tonle Sap and the lower reaches of Mekong tributaries in Cambodia. ...
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... Providing restoration of upstream and downstream longitudinal connectivity, as studied by Michel (2018) like pool-type fish, passes (Philippe, 1897), Denil fish passes (Larinier, 2002a;Rajaratnam and Katopodis, 1984), nature-like bypass channels (Gebler, 1998), fish lifts or locks (Travade et al., 1998;Clay, 1995), production of fish in the reservoir and aquaculture (Hortle and So, 2017), rehabilitation of rivers for fish (Cowx and Welcomme, 1998;Dudgeon, 2005;and Nunn and Cowx, 2012), providing fish hatchery and spillways or off takes could be taken as a solution. Settlement and urban expansion: Settlements in this sub basin are mostly scattered and settled in relation to natural resources bases, among these resource water bodies, and agricultural lands are the most required, particularly urbanization near to the lake. ...
Environmental Impact of pump irrigation projects from Lake Tana (Megech - Seraba, Tana Asrate, Tana Mekonta, Tana Wenjeta, and Tana Zegie) was studied from July 2018 to February 2019. Interactions between project activities and environmental parameters were also done by a matrix, and quantitative and qualitative analysis. As a result, identified positive impacts are new job creation, the opportunity to promote traditional agriculture and income increase, whereas land, fisheries and wetland degradation, pollution, deforestation and wildlife, inefficient water use, the decline in soil fertility, erosion, sedimentation, small aquatic animal death, and cumulative impacts are negative ones. Mitigation measures for these impacts to reduce their effects to the minimum level and recommendations have been proposed so that the execution of the projects becomes a success without harming or with the least negative effect on the environment. : Environmental science; Sustainability; Threats; Environment; Effect; Alleviation Keywords: Environmental science, Sustainability, Threats, Environment, Effect, Alleviation
