This research was conducted in October-December 2019 which took place at Peat Land of Kualu Nenas Village, Tambang Distric, Kampar Regency, Riau Province and in Soil Laboratory at Agriculture Faculty, Integrated Laboratory, Marine Chemistry Laboratory with Environmental Quality Laboratory at Fisheries and Marine Faculty of Universitas Riau. The objective of this research is to get a best dose of biofertilizer mixture from human and cow faeces to physical parameter of soil and water Patin fish culture media in peat ponds. The results of this research indicated that P4 (biofertilizer mixture of human biofertilizer 80% with cow biofertilizer 20%) is a best treatment (peat soil colour 10YR 3/1 brownish black, crude fiber of peat soil 5,43%, bulk density of peat soil 0,147 g/cm3, turbidity of peat water 74,14 NTU, total suspended solid of peat water 49,67 mg/L, absolute weight of Patin fish 17,3 g, absolute lenght of Patin fish 4,4 cm, and survival rate of Patin fish 86%). The porosity of Peat Soil, the best treatment is in P0 (control). The temperature of peat water that range from 26-29oC is still classified as optimal for aquatic organism.

Total Suspended Matter (TSM) and chlorophyll-a are water quality parameters which can be mapped using remote sensing. High TSM values could affect chlorophyll-a in phytoplankton for photosynthesis. The aims of this research were to analyze distribution, accuracy, and relationship between TSM and chlorophyll-a based on the imagery and in situ data in Prigi Coastal waters. The method that used in this research was descriptive. The data used was Landsat 8 imagery that captured on May, 20th 2018 and in situ samples taken using purposive sampling technique in 9 locations on May, 19th 2018. From the results of this research, TSM in situ value ranged from 41-64 ppm and imagery value ranged from 44-65 ppm, chlorophyll-a in situ value ranged from 1.15-2.68 mg/m3, and imagery value ranged from 1.24-2.41 mg/m3. From the results of in situ and imagery data obtained the accuracy value for TSM 74.37% and for chlorophyll-a 80.33%. The relationship between the TSM and chlorophyll-a value was y= -0.045x + 3.9103 with a coefficient value 85%, which means that the variable X (TSM) affects the variable Y (chlorophyll-a). The conclusion of this study was Prigi Coastal waters had a value at the threshold of each parameters. So, could be classified as good quality of waters. High accuracy between imagery and in situ data shows that remote sensing method was suitable for use in the Prigi coastal waters.

Riau Province has many lakes and reservoirs, one of which is the Koto Panjang Hydroelectric Reservoir, Sustainability of the Koto Panjang Hydroelectric Reservoir Unstable water continuity, drought during the dry season and flooding during the rainy season have caused this power plant to be not optimal, one of the ways that can done to overcome complications in certain areas. Koto Panjang Hydroelectric Reservoir Water is that by using the analysis of the Koto Panjang Hydroelectric Reservoir we can arrange steps in managing the maintenance of the Koto Panjang Hydroelectric Reservoir. Sustainability analysis conducted using the RAP-catchment area application on three dimensions, namely ecology, economics and social, the results of the analysis that have been carried out on the ecological dimension address an index of 52.31 which is classified as quite sustainable in the social dimension category 41.98 which is classified as less sustainable. To improve the index of sustainability in the management of water areas, several management directives are needed, namely reforestation or greening of open land related to rivers and conducting training in environmentally friendly agriculture to provide and support the protection of farming communities and communities related to fire, develop the potential of natural resources such as tourist attractions as alternative livelihoods to increase community income and increase socialization and encourage people in need in hydropower reservoir catchment areas.

Terminalia catappa is commonly present in tropical area and its can be used for increasing pH in fish culture and it also be used as disinfectant. A research aims to understand the dosages of T. catappa leaf extract to hamper the growth of Aeromonas hydrophila has been conducted from February to July 2019. A diffusion agar KIRBY BAUER method was applied to understand the sensitivity of T. catappa toward the A. hydrophila. Treatments applied were P0 (Control, Oxytetracyclin (30 µg.Disk), P1 (100%), P2 (90%), P3 (80%), P4 (70%), P5 (60%), P6 (50%), P7 (40%), P8 (30%), P9 (20%), P10 (10%) P11 (9%), P12 (8%), P13 (7%), P14 (6%), P15 (5%), P16 (4%), P17 (3%), P18(2%), P19 (1%). Pure leaf extract was obtained from fresh leaf. The disk blank was wet with 50 L of leaf extract. A. hydrophila was cultured in TSA, TSB and GSP media, and it was grew up for 24 hours. Results shown that the pure leaf extract produce 13.9 mm diameter clear zone, while 2% of pure extract produce 6.5 mm diameter clear zone.

Toba in the past few years has declined in fish catching populations. In order to find out the fisheries of lake Toba with quickly used the acoustic methode using the de-tected backscattering strength volume of fish. The amis of this research is to determine the distribution of spatial backscattering strength of fish in the lake toba. The research was carried out in the lake toba using scientific echosounder DT-X split beam re-cording device 38-1000 KHz during six days in September. The results of the acoustic data processing showed that the highest Sv value was at depth of 50-75 m which is -32, 29 (dB) and the average is -55,82 (dB), Sv was detected on the eastern edge of lake toba waters, while the lowest Sv was detected at depth of 25-50 m which is 60.00 (dB) with the mean is -57,93 (dB) spread over the edge of the southern part of lake toba. This is influenced by the condition of the aquatic enviroment an habits of fish in the lake toba.