Indonesian Journal of Limnology

Water and Sediment Quality Status of the Enim River, South Sumatra

Sat, 23 Nov 2024 00:00:00 +0700

The Enim River in Muara Enim Regency, South Sumatra, remains vital for various community activities. However, as an open water source, it is vulnerable to waste inputs from surrounding human activities, which impact the river's overall condition. This research aims to assess the water and sediment quality of the Enim River by analyzing key parameters such as pH, TSS, Fe, Mn, and temperature. Additionally, it seeks to explore the correlation between Fe and Mn content in both water and sediment and evaluate the quality status of these elements. The methodology involves descriptive analysis, where the measured values are compared against established quality standards. Correlation analysis is used to examine the relationship between Fe and Mn concentrations in water and sediment. Furthermore, the Pollution Index (PI) and Geo-accumulation Index (Igeo) methods are applied to determine the quality status of water and sediment. The findings indicate that the water quality of the Enim River exceeds acceptable standards for TSS, Iron (Fe), and Manganese (Mn). Regarding sediment quality, the Iron (Fe) levels surpass the Severe Effect Level (Level 3), while Manganese (Mn) remains below the Lowest Effect Level (Level 2). The correlation analysis reveals a strong negative correlation (-1) between Fe and Mn in water and sediment, suggesting a tightly linked inverse relationship. Overall, the Enim River's water quality is classified as Mildly to Moderately Polluted. The sediment quality, however, varies. It is categorized as Extraordinarily to Extremely Severely Polluted for Iron (Fe) and Not Polluted for Manganese (Mn).

Condition of the Progo River Upstream in Temanggung Regency based on Community Structure and Saprobic Index of Plankton

Mon, 04 Nov 2024 00:00:00 +0700

Upstream of the Progo River in Temanggung Regency, it supports the daily lives of the surrounding community. As time goes by, human activities such as land conversion, deforestation, stone mining, agricultural activities and household waste slowly affect the condition of the waters in the Progo River, so it is necessary to monitor water quality. Plankton can indicate changes in water quality because it is responsive to changes in water quality. This research aims to assess the quality of the water environment using community structure and the saprobic index of plankton. Ten sampling stations were selected using the purposive random sampling method. Plankton were collected using a plankton net, water quality measurements were carried out using a Horiba water checker, and testing in the environmental engineering laboratory. As a result, 81 plankton species had an abundance per station of 805-3,981 ind/L. The diversity index (H') indicates a stable ecosystem, the Evenness Index (e) has a fairly even distribution, and the Dominance Index (D) is at all stations with no dominant species. According to PP No. 22 of 2021, the quality of the Progo River Upstream meets environmental quality standard criteria, except for DO and total N (class I). Based on the saprobic index and bioindicator species, it indicates that all stations belong to the ?-Mesosaprobic. Several types of plankton that can be used as bioindicators of water quality include Cladophora glomerata, Tabellaria sp., and zooplankton, which are Lecane sp.

Fisheries Carrying Capacity of Joto Reservoir, Lamongan District In The Development of Culture Based Fisheries

Tue, 17 Dec 2024 00:00:00 +0700

Joto Reservoir is the largest reservoir in Tikung District and Lamongan District with a standard area of 113 ha. This reservoir is larger than Tuwiri Reservoir 84 ha and Takeran Reservoir 72 ha. The utilization of Joto Reservoir is currently still not optimal without proper management even though the trophic status of the reservoir waters is hypereutrophic. Therefore, the purpose of this study is to analyze the carrying capacity of Joto Reservoir and to analyze the types of fish and the right amount of seeds to be spread in the development of culture based fisheries. The analysis of fisheries carrying capacity determination uses the results of primary water productivity with the Beveridge Index. The results of this study state that the carrying capacity of natural fisheries in Joto Reservoir is 33.8 tons/year. And the right type of fish in the development of culture based fisheries in Joto Reservoir is freshwater lobster (Cherax quadricarinatus). Freshwater lobster seeds are 2 inches in size with a weight of 2-3 g/piece. The target harvest size of freshwater lobster for consumption is 4-5 inches in size with a weight of around 25-45 g/piece. So the number of freshwater lobster seeds that are spread in the development of aquaculture-based capture fisheries in Joto Reservoir is 916,902 tails/year or 305,634 tails/4 months.