Lake Laut Tawar Research Articles

Response of Water Temperature to Wind Speed and Air Temperature in Lake Laut Tawar, Aceh Province, Indonesia

Changes in water temperature impact the dynamics of lake ecosystems. Changing climate factors, including wind speed and air temperature, influence the water temperature of lakes. This research aims to analyze the response of water temperature to wind speed and air temperature in Lake Laut Tawar. Observations were conducted from August to September 2023, with a sampling frequency of every two weeks. The results revealed that water temperature, wind speed, and air temperature in Lake Laut Tawar fluctuated according to the presence of light, namely day and night factors. Variations in sunlight intensity lead to hourly fluctuations in air temperatures, while wind speeds vary hourly due to changes in air pressure, consequently resulting in hourly variations in water temperature as well. During daylight hours, air temperature surpasses water temperature, whereas during nighttime hours, water temperature exceeds air temperature. Heat transfer from the air to the water contributes to an increase in water temperature, while the release of heat energy from the surface water into the air leads to a decrease in water temperature. Changes in the water temperature of Lake Laut Tawar are primarily influenced by changes in wind speed and air temperature by 80 percent simultaneously. However, while air temperature showed a partial response, wind speed did not exhibit a significant response. The relationship between these variables can be expressed through a mathematical model Tw = 0.356 Ta + 0.025 W + 15.674, where Tw is water temperature (°C), Ta is air temperature (°C), and W is wind speed (km/minute). Another factor that influences the water temperature of Lake Laut Tawar is the inlet water temperature, which was not observed in this research.

Literasi Inklusi Keuangan Digital Berbasis Ekonomi Syariah bagi Nelayan Ikan Depik (Endemik) Danau Laut Tawar

The Depik Fishermen (Rasbora Tawarensis/Lepsotoma) in Lake Laut Tawar, Central Aceh, mostly still employ traditional systems in the process of selling Depik Fish. Introduction to digital marketing is needed for Depik fishermen to market this endemic fish to the public. The aim of this community service was to increase the income of Depik fishermen in Lake Laut Tawar and to explain various digital marketing strategies suitable for increasing sales of Depik fishermen in Lake Laut Tawar. The community service method used Participatory Action Research (PAR) with interview instruments, observations, seminars, and training to obtain desired results. The results of the community service successfully introduced digital marketing systems to Depik fishermen by creating Instagram accounts, opening shops on Shopee and Online Stores. Additionally, it introduced online Sharia financial platforms besides Banks, such as Investree, Ammana – Online Sharia Loans, Online P2P Lending Loans, BSalam, and others. There were also investment platforms like Amartha.com, specializing in SMEs, Bibit with its flagship product mutual funds, and crowdfunding systems like Tani Fund. However, there were some issues such as decreasing Depik catch results due to the use of floating cages, resorts along the lake, and the presence of Hoe fishermen. As for Depik fish catches, in the first quarter of 2021 it amounted to 12.602 tons, then increased in the second quarter to 18 tons, then decreased in the third quarter to 1.444 tons and significantly decreased again in the sixth quarter to 0.031 tons.

Effectiveness of Different Tyroxine Hormone Dosages on The Growth Performance And Violability of Depik Fish (Rasbora tawarensis)

Depik fish is a fish which is one of the endemic species in Lake Laut Tawar, Central Aceh Regency. Typical fish of the Gayo community which is currently being developed for domestication. However, from the results of several studies, the growth of depik fish is relatively slow, so it needs to be increased. One way to accelerate the growth of depik fish is by hormonal induction, through immersion in the hormone thyroxine with different doses. The aim of this research is to evaluate the growth performance and survival of depik fish soaked in thyroxine hormone with different doses of thyroxine hormone. This research was carried out at the Lukup Badak Fish Seed Center (BBI), Central Aceh using a completely randomized design (CRD) experimental method with four treatments and three repetitions. The treatments in this research were different durations of immersion in the thyroxine hormone, namely: no dose (P0), 0.05 mg/ liter (P1), 0.1 mg/ liter (P2), and 0.15 mg/ liter (P3). Meanwhile, the duration of the thyroxine hormone soaking used is 24 hours. Rearing of fish seeds is carried out using an Aquarium measuring 30 cm long, 20 cm wide and 25 cm high according to the treatment, for 28 days with a stocking density of 20 fish/container. This study concluded that different doses of the thyroxine hormone in Depik fish fry gave the highest growth in the treatment dose of 0.15 mg/liter, while the lowest growth was in the control treatment (no dose).

Strategi Komunikasi Pemasaran Gayo Camping Ground Terhadap Upaya Meningkatkan Pengunjung Wisata Ke Danau Laut Tawar

This thesis is entitled "Gayo Camping Ground Marketing Communication Strategy for Efforts to Increase Tourism Visitors to Lake Laut Tawar" This type of research is descriptive qualitative research. The problems examined in this thesis are about how the Gayo Camping Ground marketing communication strategy is in an effort to increase tourist visitors to Lake Laut Tawar and how are the communication barriers for the Gayo Camping Ground tour crew. Data collection techniques are carried out by observation, interviews, and documentation. This research was carried out at Pante Ujung Mepar and the Gayo Camping Ground Office for one month, from June to July. The results of this study indicate that Gayo Camping Ground in increasing visitors uses the marketing mix theory from Kotler and Keller which consists of product, price, place, promotion, and person, and shows the beginnings of Gayo Camping Ground tourism in Central Aceh which initiated by Satria Darmawan. Gayo Camping Ground's marketing strategy, according to the researcher's analysis, is very good because implementing promotions via Instagram and Tiktok is in fact very effective in increasing the number of new customers (visitors). In this study there were six informants as data sources. Communication barriers at Internal Gayo Camping Ground show ineffective delivery and response from leaders to crew accompanied by certain factors such as noise, lack of concentration and also poor delivery.

Model of nitrogen-phosphorus ratio and phytoplankton relationship in lake Laut Tawar, Indonesia

Phytoplankton blooms in the lake cause ecological, economic, health, energy, and aesthetic losses. It reduces water quality and biota diversity, creates toxins in the waters, and changes the structures and functions of the ecosystem. The essential nutrients for the growth of phytoplankton are nitrogen and phosphorus. Controlling phytoplankton growth can be managed by controlling the limiting nutrient input. This study aims to identify the limiting nutrient, analyze variations in TN:TP ratio spatially and temporally, and model TN:TP ratio and chlorophyll-a relationship. This study used secondary data from previous studies, namely TN, TP, and chlorophyll-a observed monthly in seven stations purposively during a year. Rainfall data was also obtained from the previous study. Limiting nutrients were determined by Redfield theory, and data were analyzed by Spearman correlation, One-way ANOVA, Kruskal-Wallis, and regression analysis. The results showed phosphorus was a limiting nutrient for phytoplankton growth in Lake Laut Tawar. TN:TP ratio and chlorophyll-a did not vary spatially, indicating the lake surface waters were evenly mixed. The parameters varied temporally, expressing the influence of hydroclimatological factors, especially rainfall. Rainfall increases nutrient input to the lake, but only rain below 200 mm/month causes an increase in the concentration of nutrients in the lake. The rainfall above 200 mm/month increases lake water volume significantly, thereby reducing nutrient concentrations. TN:TP ratio and chlorophyll-a related negatively and formed a non-linear relationship with an empirical model Chlorophyll-a = 2770.285 (TN/TP)-1.871. Eutrophication of Lake Laut Tawar should be anticipated by controlling the anthropogenic phosphorus input.Keywords:AnthropogenicChlorophyll-aEutrophication,Limiting nutrientRainfall

Penyuluhan penggunaan pakan berwawasan lingkungan kepada pembudidaya keramba jaring apung di Danau Laut Tawar Aceh Tengah (Counseling on the use of environmentally conscious feeding to floating net cage farmers in the Lake Laut Tawar Aceh Tengah)

Cultivating Floating Net Cages on Lake Laut Tawar has become an activity supporting the people's economy. The profits obtained by cultivators range from IDR 2.5 – 7 million per maintenance period. However, on the other hand, this activity can reduce the carrying capacity of the waters of Lake Laut Tawar due to waste pollution originating from leftover feed. One of the impacts is the mass death of fish in the floating net cages. The core problem of this problem is the lack of knowledge of Floating net cage cultivators and workers regarding feed management and water pollution. This problem can be solved by increasing the knowledge of Floating net cage farmers and workers in Lake Laut Tawar. The method used in this activity was counseling on using environmentally friendly feed in the Floating Net Cage system for fish farming in Lake Laut Tawar, Central Aceh. The aim and output targetted of this community service activity were to increase the application of science and technology in the community, in the form of improving the management of the use of fish feed d in floating net cages system. Evaluation of the level of success and satisfaction of participants was carried out using a questionnaire. Based on an analysis of the level of satisfaction and success, 80-90% of farmers are very satisfied with this community service activity. The benefits of this activity provide knowledge and positive motivation for partners in tilapia culture in floating net cages by increasing production as well as protecting the environment from pollution.

Building Brand Love for Travelers Through Accessibility, Destination Image, and Emotional Energy in Individuals at Laut Tawar Lake

Deep goals study This is for know directly influences accessibility, destination image, and emotional energy in individuals towards brand love. Type of research that is study quantitative. The population is previous tourists who have visited Lake Laut Tawar for at least two visits. Deep sample study This was taken with an accidental sampling technique of 100 tourists. Data was collected with a compiled questionnaire based on each indicator variable research. Analysis results study show that accessibility, destination image, and emotional energy in individuals direct influential significance towards brand love. The most dominant variable influencing tourist brand love is accessibility compared with destination image and emotional energy in individuals.

Growth performance and biomass aquatic plants of Hydrilla verticillata in floating net cages and non-floating net cages in Laut Tawar Lake

Aquatic plants of Hydrilla verticillata have a role as a provider of natural food for the aquatic biota of Laut Tawar Lake. This study aimed to analyze the biomass growth of submerged aquatic plant of Hydrilla verticillata found in the KJA and non-KJA areas in Laut Tawar lake. The research was conducted from January to April 2022 in Laut Tawar Lake, Central Aceh Regency. The method used in determining the station of this research is purposive sampling. Data collection on aquatic plant growth was carried out at 2 observation stations using the quadratic transect method measuring 1 x 1 m. The results showed that the growth of the aquatic plant Hydrilla verticilata in Laut Tawar Lake was at a KJA station of 0.72 cm compared to a non-KJA 0.59 which was significantly different (p>0.05). The biomass of aquatic plant of Hydrilla verticilata measured was dry biomass with a value of 574 g/m2 at the KJA station while at the KJA station it was 203 g/m2. The density of water plants Hydrilla verticilata at KJA stations is 270 ind/m2 while at non-KJA stations is 173 ind/m2. It can be concluded that the growth of aquatic plants Hydrilla verticillata is greater than that of non-KJA stations.

Cherax quadricarinatus: Identifying potentially invasive species in Lake Laut Tawar through their bio-population aspects

Cherax quadricarinatus is an introduced species that is deliberately stocked in Lake Laut Tawar, Takengon, Indonesia. This study aims to analyze bio-population aspect of this species, including length frequency distribution, length-weight relationship, condition factors, and biology reproductive. A total of 361 individual was sampled bi-weekly from October to December 2021 in Lake Laut Tawar, Central Aceh, Indonesia. The carapace length of the crayfish ranged from 26.5 to 69.9 mm CL, with the length class mode being 41.69 mm CL. The growth pattern of freshwater crayfish is negative allometric (b<3) as described as an equation W = 0.0002CL29522 (R2 = 0.907). The sex ratio of C. quadricarinatus between male and female was in balance ratio (1:1) (Chi-square test result). The length of maturity (L 50) in male was 49.49 mm CL, while in female was 47.41 mm CL. The highest gonad somatic index (GSI) was in December at 1.02, while the lowest was in November at 0.79. Fecundity of female ranged from 267 to 970 eggs.

Community structure of periphyton at floating net cages and non-floating net cages in Laut Tawar Lake, Aceh Tengah

Many activities are carried out around the Laut Tawar lake, one of which is the cultivation of floating net cages that can contribute nutrients to the waters. One of the organisms that can take advantage of the abundance of nutrients in the waters is periphyton. This study aims to examine the community structure of periphyton as natural food in Laut Tawar Lake. This research was conducted in January-April 2022. The results showed that there are 9 classes of periphyton at the KJA station, namely Bacillariophyceae, Chlorophyceae, Cyanophyceae, Rhizopoda, Dinophyceae, Euglenophyceae, Trebouxiophyceae, Klebsormidiophyceae and Coscinodiscophyceae. While, at non-KJA stations there are 7 classes where the Klebsormidiophyceae class and the dinophyceae class are not found at non-KJA stations. The highest abundance at the KJA station was on the 7th day with a value of 108,655 cells/cm2 and non-KJA was 24,552 cells/cm2. The lowest abundance occurred on day 14 at both stations. Periphyton diversity index at KJA and non-KJA stations ranged from 1.88-2.76, which was moderate. The evenness index of periphyton species ranging from 0.61-0.75 was classified as high, while the dominance index ranging from 0.09-0.24 was classified as low. Based on the values obtained, the community structure of periphyton on artificial substrates in the KJA and non-KJA areas in Laut Tawar Lake experienced moderate ecological stress with the community in a stable condition. The t-test results obtained that the abundance values at KJA stations and non-KJA stations had the difference that the abundance of periphyton at KJA stations was greater than at non-KJA stations.

Upaya Meningkatkan Pengetahuan Konservasi Sumberdaya Hayati Ikan Endemik Depik di Danau Laut Tawar Melalui Kegiatan Outing Class SDIT Sunnah An-Najah Aceh Tengah

The survival of the endemic depik fish in Lake Laut Tawar is threatened by the over-utilization of fish biological resources and the decline in environmental quality. This situation is believed to result from the community's lack of knowledge and understanding of endemic fish and their life aspects. To address this issue, sustainable efforts are required to conserve the biological resources of the depik fish, one of which involves enhancing public knowledge and understanding through counselling sessions. As part of a community service activity, counselling occurred on December 1, 2022, coinciding with an outing class of students from SDIT Sunnah An-Najah in Takengon, Central Aceh. The activity consisted of three sessions: 1) administering an initial questionnaire (pre-test) to assess baseline knowledge, 2) delivering informative material through counselling, and 3) evaluating the achievements of the activity. The overall evaluation results indicated that the partners' average knowledge increased by 51.19% after the counselling session. To ensure the continuity and consistency of depik fish's biological resource conservation in Lake Laut Tawar, it is recommended to incorporate learning about fish biological resource conservation into the curriculum and local school content.

Mapping Analysis for Vulnerable Areas and Erosion Rate of Laut Tawar Lake, Peusangan Watershed

Mapping Analysis for Vulnerable Areas and Erosion Rate of Laut Tawar Lake, Peusangan Watershed

Pengembangan Modul Pembelajaran Biologi Berbasis Potensi Lokal Danau Laut Tawar Takengon Ikan Depik (Rasbora Tawarensis) pada Materi Vertebrata

This study aims to determine the validity, practicality and effectiveness of biology learning modules based on local potential of Lake Laut Tawar Takengon Ikan Depik (Rasbora Tawarensis) on Vertebrate Material. This study used the Research and Development (R&amp;D) research method based on the Thiagarajan methodology with four stages including define, design, devolepment and disseminate stages. This research was carried out from September to January 2022 with a sample of 26 students from SMA N 8 Takengon Unggul. The results showed that the biology learning module based on the local potential of Lake Laut Tawar Takengon Ikan Depik (Rasbora Tawarensis) is very suitable for use in learning. The validity test was tested by material experts and media experts. The material expert test was obtained by 81.37% and the media expert test was obtained by 81.25% and was included in the very feasible category to be used in learning. The practicality test was tested based on the responses of the biology teacher at SMA N 8 Takengeon Unggul and the responses of 26 students who were seen based on the response questionnaire sheet. The teacher's response test was obtained at 98.23% and the student's response test was 93.6% in the practical category used in the learning process. Testing the effectiveness of obtaining a score of 100% improves student learning outcomes during learning, this is evidenced by students' answers when tested based on the post-test questions given. So it can be concluded that the biology learning module based on local potential of Lake Laut Tawar Takengon Depik Fish (Rasbora Tawarensis) on Vertebrate Material is effective and appropriate for use in learning.&#x0D; Keywords: Module, Local Potential, Depik Fish

Analysis of Microalgae Growth Based on Availability of Nutrients in Freshwater

Microalgae have the potential to developed into medicinal products, wastewater treatment, food and energy products. Indonesia is a tropical country has the potential to produce microalgae. The growth of microalgae was influenced by several factors, the main factors is nutrition. This study aims to produce a pattern of mathematical relationships between microalgae growth and nutrient availability of the Laut Tawar Lake. Data collection was carried out for 30 days with a frequency of 7 days at 7 stations. Furthermore, the analysis was carried out to obtain concentration values of nitrate, phosphate and chlorophyll-a. Nitrate concentrations during the study ranged from 310-430 µg/L. The lowest average nitrate concentration was found at Station 4, which was 330 ± 34.64 µg/L and the highest was found at Station 3, which was 396.67 ± 41.63 µg/L. Phosphate concentrations during the study ranged from 18 – 22 µg/L. The highest phosphate concentrations were found at Station 1 and Station 6, which were 20.67 ± 0.58 µg/L and 20.67 ± 1.53 µg/L, and the lowest were found at Station 3, which were 19.00 ± 1.00 µg/L. The concentration of chlorophyll-a ranges from 5 – 12 µg/L. The highest average concentration of chlorophyll-a was obtained at Station 6, which was 10.00 ± 1.00 µg/L and the lowest was found at Station 3, which was 7.00 ± 2.00 µg/L. In conclusion, increasing nitrate in the Lake Laut Tawar did not increase microalgae biomass, microalgae species in that habitat were influenced by nutrient phosphate.

Length frequency distribution, growth, and condition factor of the endemic cyprinid fish Poropuntius tawarensis, in Lake Laut Tawar, Central Aceh, Indonesia

The Poropuntius tawarensis fish is an endemic fish of the family Cyprinidae found in Laut Tawar Lake, and has been listed on the Red List. This study aims to reveal the frequency of length distribution, growth patterns and condition factors of the fish in the lake as basic information for conservation. The study was conducted from January to May 2022 in the Laut Tawar Lake of Central Aceh. Sampling was conducted at four sampling sites based on representative activities on the lake. The location of the study was determined based on differences in environmental characteristics, namely Station 1 (Teluk One-One), Station 2 (Bewang), Station 3 (Gegarang) and Station 4 (Kebayakan). The results showed that the fish at Bewang Station was relatively higher in terms of the frequency of the length distribution. The growth pattern of male and female fish was negative allometric (b<3).The condition factor of the three stations was relatively the same ranging from 0.94 to 1.39, but it was different from the one-one station with a condition factor of 0.01.The value of the condition factor that can be obtained had insignificant differences every month, namely 1.12±0.38 (January), 1.00±0.49 (February), 0.93±0.55 (March), 0.85±0.59 (April), and 1.17±0.32 (May).

Influence of Rainfall and Spatial Temporal Distribution Analysis of Total Suspended Solid in Laut Tawar Lake

Total Suspended Solid (TSS) is a solid particle suspended in the water column of organic and inorganic materials, sized more than two micrometers. The high concentration of TSS in the waters causes a decrease in water clarity and potentially reduces dissolved oxygen that can threaten the life of aquatic biota. This study aims to analyze the spatial and temporal distribution of TSS and analyze the influence of rainfall on TSS in Laut Tawar Lake waters. The lake TSS ranged from 44 – 91 mg/L with an average of 68.67 ± 11.23 mg/L. Spatially TSS ranged from 63.17 - 73.67 mg/L and temporally ranged from 51.14 - 81.43 mg/L. The distribution of TSS was not spatially different because the lake waters are perfectly agitated. The difference in TSS was obtained temporally due to the influence of rainfall. The catchment area can be eroded by only 100 mm of rain/month. It leads to high production of TSS loading into the lake waters. It was indicated by the difference in TSS of Dry Months with TSS of Wet and Moist Months. The determinant coefficient of influence of rainfall on the TSS concentration of the lake waters is 0.62.

Pemodelan Status Trofik Danau Laut Tawar Aceh Tengah

The trophic status of Laut Tawar Lake was increasingly leading to an alarming level of degradation. Efforts to anticipate an increase in trophic status require scientific knowledge of the trophic phenomena of the waters empirically. This research examines the trophic status parameters to produce a model of the trophic status of Laut Tawar Lake. The proposed model was a modification of Carlson's Trophic State Index Method. Analysis of the relationship examined the interaction of water clarity (SD) with chlorophyll-a (Chl), Total Suspended Solid, and Total Dissolved Solids, and the interaction of chlorophyll-a with nutrient concentration (TP, TN). Data were analyzed descriptively quantitatively, correlation, and regression. The results showed that the waters of Laut Tawar Lake contain phosphate (TP) 34 µg/L, Total Nitrogen 687 µg/L, chlorophyll-a 10 µg/L, Total Suspended Solid 47 mg/L, Total Dissolved Solid 84 mg/L, and water clarity 4.0 m. The regression test showed that the abundance of phytoplankton (Chl) was affected by nutrient phosphate with the empirical model equation Chl = 0.565 TP – 9.161. Nitrogen nutrients did not partially affect the concentration of chlorophyll-a in the waters of Laut Tawar Lake. Water clarity is influenced by chlorophyll-a and TSS, where TDS has no effect partially. The empirical model obtained is Ln SD = 1.757 – 0.013 Chl – 0.008 TSS. Modification of Carlson's TSI by substituting the two equations obtained the equation TSIdlt = 13.46 + 8.08 ln TP + 0.04 TP + 0.04 TSS. This model simulation gives an estimation rate of 91.06%.

Induction of oocyte developer hormones (oodev) on the maturity of Poropuntius tawarensis

Poropuntius tawarensis is an endemic fish belonging to the Cyprinidae family found in Laut Tawar Lake, Central Aceh, Indonesia. P. tawarensis has a limited distribution and the fertilization only occurs in the rainy season. The purpose of this research was to observe the effect of Oodev hormone with different doses on the maturity of P. tawarensis. This study was used completely randomized design (CRD) consisting of 3 treatments and 3 replicates. Treatments used were the hormone doses of 0.25 mL/kg, 0.50 mL/kg and treatment without hormone (control). The parameters used in this study were gonadosomatic index (GSI), egg diameter, coefficients of variation (CV) of egg diameter, fecundity, and hepatosomatic index. The study revealed the highest value found in a dose of 0.50 mL/kg which the value of egg diameter was 0.8791±0.02 mm, coefficients of variation of egg was 6.46±0.49% and fecundity was 869±33.99 egg/kg. While the highest gonadosomatic index was found in a dose of 0.25 ml/kg (10.41±2.03%). Moreover, the induction of Oocyte developer (Oodev) hormone on the maturity of P. tawarensis did not significantly affect the hepatosomatic index (HSI), but Oodev hormone was efficient to accelerate the gonad maturity of fish.

Analysis of Crayfish Catches Using Bubu Wau in Laut Tawar Lake, Central Aceh, Aceh

Laut Tawar Lake is located in the town of Takengon, Central Aceh district. Currently, Laut Tawar Lake has been utilized by the surrounding community as a fishing spot. One of the fishing gears used by fishermen is Bubu wau. One of the catches obtained by fishermen is crayfish. The crayfish has a high economic value, so the lack of control over the intensity of the catch also causes the average size of the crayfish caught, because catching crayfish is a transition from catching Rasbora tawarensis. One of the problems that frequently occur and research on crayfish has never been done before. Therefore, this research needs to be done. The purpose of this study was to determine fishing catch compositions of Bubu wau and the size distribution of crayfish carapace length of Bubu Wau fishermen in the Teluk One-one, Laut Tawar Lake. The research was carried out in about March 2021. The description of the fishing catch composition was analyzed by using the describded method. The size distribution of crayfish carapace length was analyzed by the Sturgess rule. From the results of the study, it can be concluded that the catch compositions of Bubu wau in Teluk One-one are crayfish, suckermouth catfish, channeled apple snail and tilapia. The type of crayfish caught by fishermen’s Bubu wau was Cherax quadricarinatus amount of 4232 individuals (89% of the total catch), where the total length of the dominant crayfish carapace was 4.4-4.9 cm with a total number of 1403 and the least with a size of 8.6-9.1 cm was 1 crayfish from the total catch

The waters transparency model of Lake Laut Tawar, Aceh, Indonesia

Lake Laut Tawar in Aceh Province, Indonesia is an important ecosystem that has several endemic biotas such as Rasbora tawarensis and Poropuntius bargensis. Eutrophication is a potential problem in Lake Laut Tawar. To evaluate the trophic state needed the value of water transparency. This study aims to formulate a model for estimating the transparency of Lake Laut Tawar waters. The dependent variable was water transparency, and the predictors variable was the chlorophyll-a concentration, total suspended solids, and total dissolved solids. Observations and sampling were conduct starting from October 2016 to September 2017. Data analysis was using simple regression, multiple regression, and one-way ANOVA. The result showed a decrease in waters transparency (SD) was caused by increased phytoplankton density (Chl-a), suspended material (TSS), and dissolved material (TDS). But the dissolved matter did not have a partial effect if the values of other variables are constant. The model to estimate the water transparency of Lake Laut Tawar is Log SD = 1.414 – 0.322 Log Chl-a – 0.406 Log TSS. The average values of water transparency did no differential between the seven observation stations. It is presumably because the waters of Lake Laut Tawar are easily mixed.