Fishery activities and environmental condition of Maninjau Lake, West Sumatra

Makmur, Safran; Muthmainnah, Dina; Subagdja,

doi:10.1088/1755-1315/564/1/012025

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…The color of waters became forage-colored that characterizes its condition. It also happened in the lake with floating net cages that leftover food accumulated at the bottom of the water, affected the waters color change into dark green, as reported by Makmur et al (2020). The high eutrophic status value effect the blooming aquatic plants, thus affecting the oxygen supply in the waters.…”

Section: Determination Of Trophic Status Index (Tsi)mentioning

confidence: 91%

Water Quality and Trophic Status of Koto Panjang Reservoir, Indonesia

Muthmainnah

Rais

2021

Indonesian. J. Limnol.

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Koto Panjang Reservoir is one of the hydroelectric power plants in Indonesia, located in Kampar Regency, Riau Province. This paper aims to determine the water quality and tropic status of the Koto Panjang Reservoir. The research was carried out along the Koto Panjang Reservoir, covering the floating net cages area, inlet, outlet, and the center of the reservoir. Water samples were collected twice a year, February and September 2017. The results showed that the water quality of Koto Panjang reservoir is still within the tolerance range for the aquatic organisms' life, including fish. Based on the TSI analysis, the Koto Panjang Reservoir throphic status was categorized as eutrophic to heavy eutrophic. This study recommends that relocating floating net cages is necessary so that the nutrient load will not only be concentrated in one location. The efficiency of using the feed for floating net cages could minimize the waste.

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Section: Determination Of Trophic Status Index (Tsi)mentioning

confidence: 91%

Water Quality and Trophic Status of Koto Panjang Reservoir, Indonesia

Muthmainnah

Rais

2021

Indonesian. J. Limnol.

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“…These fishery activities had deteriorated the water quality of Lake Maninjau, which is indicated by the frequency of mass fish kills every year and caused enormous economic losses. Until 2017, 11 times fish were killed happened, which increased in 2016 (Makmur et al, 2020).…”

Section: Study Sitementioning

confidence: 99%

Water Quality Assessment of Lake Maninjau After the Mass Fish Kill Event

Jasalesmana,

Putri,

Abdurrachman

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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A mass fish kill is often occurring in Lake Maninjau. A lack of oxygen has reportedly resulted in numerous fish kills, including the recent lake Maninjau condition. Deoxygenation of lake water is a natural phenomenon that often occurs after heavy rain events and low sunlight intensity. Additionally, during the strong wind for a long period, the decrease in oxygen could be chemically triggered by the diffusion of sulfide from the bottom layer of the water column. Furthermore, this study examines water quality parameters after the mass fish mortality occurred across locations in Lake Maninjau. Field surveys were conducted by measuring physiochemical parameters and total sulfide at the Fifteen sampling points (five points in the middle and ten points around the lake) from November 26 to December 2, 2022. They were measured directly using the Horriba©U 52 water quality checker (WQC), DO meter YSI ProDO© International and the HACH spectrophotometer DR3900 method. The results show that the average DO levels at each observation point were close to 0 mg/L while the average sulfide level on the surface was 9.5 micro g/L. The average Oxidation Reduction Potential (ORP) of -79.26 mV indicates that the lake is in a reduced state and signifies that much of the dead and decaying material in the water would be slowly broken down and decomposed. Low ORP values indicate that the compound in the water is available in reduced form, which is more toxic. Our diel DO measurement show that sunlight intensity was effective in increasing oxygen concentration in the lake.

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“…The difference in TSI values is due to the difference in the concentration and transparency of the total phosphorus and chlorophyll-a compared to these points farther from the fish cage [62]. Floating net cages can cause changes in the color of the lake from the residual feed that accumulates at the bottom of the lake affecting the color to dark green [63]. Measurements of trophic levels were carried out in two versions using data on the concentration of total phosphorus on the surface and bottom layers.…”

Section: -80mentioning

confidence: 99%

Water Quality and Trophic Status to Estimate Fish Production Potential for Sustainable Fisheries in Lake Poso, Central Sulawesi

Kaban¹,

Ditya²,

Makmur³

et al. 2023

Pol. J. Environ. Stud.

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Lake Poso is a tectonic lake and the third largest of the lake in Indonesia, and is a potential area for endemic fish resources and tropical eels, disturbance to ecosystem balance in the form of habitat destruction and unfriendly fishing techniques will affect the existence of these resources. This study aimed to determine and evaluate the current condition of water quality, trophic status, and potential for fish production in Lake Poso. Observations were conducted in 2021 in five stations with random purposive methods sampling. The observed main parameters were water quality such as depth, transparency, temperature, conductivity, pH, dissolved oxygen, alkalinity, hardness, phosphate, nitrate, ammonia, and chlorophyll-a. The results showed that the characteristics of the water quality parameters and trophic status index, classified as waters were good for the life of fish and other organisms. The productivity rate of the lake waters seen from the value of the trophic status index was 46.18 which classified the waters at a mesotrophic level. The potential for fish production was low with numbers ranging from 2445-2605 tons/year and an average of 2545 tons/year. Finally, to maintain aquatic biological resources and sustainable fisheries in Lake Poso are needed (a) maintaining the value trophic state index in condition oligotrophic and mesotrophic, (b) protecting the habitat around the lake by maintaining the optimal vegetation limits, (c) maintaining the aquaculture activities so it no growth up and water condition keep stable and (d) maintaining the capture endemic fish species with traditional fishing gear methods.

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Fishery activities and environmental condition of Maninjau Lake, West Sumatra

Cited by 6 publications

References 1 publication

Water Quality and Trophic Status of Koto Panjang Reservoir, Indonesia

Water Quality and Trophic Status of Koto Panjang Reservoir, Indonesia

Water Quality Assessment of Lake Maninjau After the Mass Fish Kill Event

Water Quality and Trophic Status to Estimate Fish Production Potential for Sustainable Fisheries in Lake Poso, Central Sulawesi

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