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<strong>Fish Distribution at Different Inundation Areas in Lake Tempe, South Sulawesi. </strong>Lake Tempe area consists of permanent standing watersand non-permanent area (flooded area). This study aims to investigate the species and its relative abundance distribution, as well as the distribution of size, condition factor, and gonad maturity stage of dominant species at those different areas. Sampling was carried at high water level period (March, June, and August 2017) in 18 stations, stations 1 to 13 represent the non-permanent inundation areas, and stations 14 to 18 represent the permanent inundation area. Fish was caught using various gears. Fish was identified morphologically and the number was counted. The size of the dominant species was measured and the gonad maturity stage was determined. Data were analyzed using descriptive and inferential statistics. The results of this study show that the highest number of species is found in non-permanent inundation areas. Species that are only found in non-permanent inundation areas are <em>Clarias batrachus</em>, <em>Anabas testudineus</em>, <em>Pangasianodon hypopthalmus</em>, and <em>Trichopodus pectoralis</em>. The dominant fish in the non-permanent inundation area are <em>Oxyeleotris marmorata</em>, <em>Channa striata</em>, <em>Oreochromis niloticus</em>, <em>Trichopodus trichopterus</em>, and <em>Pterygoplichthys pardalis</em>. These fishes have contributed significantly to capture fisheries production. The most abundant fish is <em>Barbonymus gonionotus</em>. The condition factor and the gonad maturity stage of the <em>B. gonionotus</em>in in the both areas were not significantly different. Larger fishes and higher relative abundance of <em>B. gonionotus</em>, when the water level was rising, were found in permanent inundation area. It can be concluded that the existence of those different inundation areas is important for fisheries productivity in Lake Tempe

<strong>Model of 2-Dimensional Layered Spatial Distribution of Suspended Load in Lake Tempe.</strong> Accumulation of sediment in Lake Tempe deriving from Bila, Sidenreng, and Batu-batu Rivers in the region of Walannae River will be dredged during barrage operation, but until now the location of sediment accumulation in the lake is still unknown. This study developed a model of 2-dimensional layered spatial distribution of suspended materials in Lake Tempe to determine the extent of sedimentation in the lake from suspended material inputs, so the location of sediment dredging can be determined appropriately. Model was calibrated using the observation data of TSS concentrations at 15 points in Lake Tempe at water level of 5 m which took place in March 2014. The result showed that the model was in accordance with the observed data. Based on the simulation of range setting of effluent discharge, it is known that if the range setting of effluent discharge is narrowed, the deposition of suspended loads in the lake becomes higher, so the TSS that comes out of the lake will be less. Based on the model simulation and simulation of suspended load reduction of the influent for each zone, the accumulation of sediment in Lake Tempe happens around the deepest area between Zone I and Zone III, and the factor affecting the distribution of TSS in the lake is the suspended loads of the influent from Bila River and the effluent discharge. <br /><br /><br />