Physical habitat assessment for dominant freshwater fish species in Galas River Basin, Kelantan, Malaysia
This study elucidates the relationship of different flow regimes as a function of physical microhabitat changes, besides determining the optimum flow required to maintain suitable habitat for three target freshwater fish species. These species namely Mystacoleucus obtusirostris (Sia), Barbonym...
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| 主要作者: | |
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| 格式: | Thesis |
| 语言: | English |
| 出版: |
2016
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| 主题: | |
| 在线阅读: | http://psasir.upm.edu.my/id/eprint/67248/1/FPAS%202016%209%20IR.pdf |
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| 总结: | This study elucidates the relationship of different flow regimes as a function of
physical microhabitat changes, besides determining the optimum flow required to
maintain suitable habitat for three target freshwater fish species. These species namely
Mystacoleucus obtusirostris (Sia), Barbonymus schwanenfeldii (Lampam sungai) and
Cyclocheilichthys apogon (Temperas) were selected based on five criteria; most
sensitive, transferability, economic and social interest, vulnerability and extent
available information. The issue need to be tackle in this study is river basin
significantly causes alteration to the flow regime as well as deterioration of water
quality, which subsequently causes alteration to the fish population in terms of its
wellbeing and population growth. Any alteration by human activities put the integrity
of the river ecosystem at risk in study area especially sedimentation problem. The
increasing on human activities gives negative impact to the freshwater fish in the river.
Moreover, it more challenge when these freshwater fishes are regarded as an economic
source to the local residents along the river. Regarding this issue, hydrological index
method (7Q35 analysis) and physical habitat simulation (Physical Habitat Simulation
Model) are adopted for an environmental flow assessment. Besides that, in this study is
analysing the hydrological factor that affected the flow regimes for example water
quality analysis, land use changes and soil loss. From the calculation of minimum
annual mean (MAM) has recorded 7-day low flow for every 50-year period is about
5.786 m3/s for low flow event. Otherwise, from the simulation water levels need to
cater for these three freshwater fish species to survive in certain reach along the Galas
River species are at 0.40 m (Mystacoleucus obtusirostris), 0.60 m (Barbonymus
schwanenfeldii) and 0.40 m (Cyclocheilichthys apogon). The recommended flow
regimes in the study area are based on the surface area of usable habitat calculation for
three targeted species respectively is at 6.42 m3/s,10.89 m3/s and 7.26 m3/s. Lastly, the
recommended flow regime for the Galas River is 10.89 m3/s and it derived for this
study as one of propose input to the assessment of alternative stream flow management
in the future. |
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