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Asmika Harnalin Simarmata
Dosen Pengajar Jurusan Manajemen Sumberdaya Perairan Fakultas Perikanan Dan Ilmu Kelautan Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Physics Social Sciences

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Trophic state of the Tanjung Putus Lake, based on Nygaard Index Eko Simatupang; Asmika H. Simarmata; Tengku Dahril
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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ABSTRACT   Nygaard Index can be used to determine the trophic state of waters. Calculation of this index is based on the number of phytoplankton species in these following groups, namely Desmidiaceae, Myxophyceae, Chlorococcales, Centric diatom and Euglenophyceae. To understand the trophic state of the Tanjung Putus lake, a research has been conducted in February - March 2018. There were three sampling stations, namely station 1 (inlet area), station 2 (the middle of the lake) and station 3 (out let area). In each station there were two sampling points, in the surface and 2 secchi depth. Sampling were conducted 3 times, once/week. Water quality parameters measured were phytoplankton (type and abundance), transparency, temperature, pH, nitrate, phosphate, Dissolved oxygen and free carbon dioxide. Results shown that there were 6 groups of phytoplankton present, namely Desmidiaceae (6 species), Myxophyceae (3 species), Chlorococcales (9 species), Centric diatom (5 species), Cryptophyceae (2 species) and Euglenophyceae (2 species). Water quality parameters were as follows: transparency 77.5-102.5 cm, temperature 30-32 0C, pH 5, nitrate 0.04-0.07 mg/L, phosphate 0.03-0.09 mg/L, Dissolved oxygen 4.1-6.5 mg/L, free carbon dioxide 6.6-11.9 mg/L, Nygaard Index value : 2 – 2.6. Based on Nygard Index, the trophic state of the Tanjung Putus Lake can be categorized as mesotrophic to eutrophic. Keywords: Nutrient, Phytoplankton, Mesotrophic, Eutrophic
Relationship between Organic Matter and Productivity of the Bakuok Lake Aur Sati Village, Tambang District, Kampar Regency, Riau Province Natasya Margareth Pasaribu; Asmika Harnalin Simarmata; Madju Siagian
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 7, No 1 (2020): Edisi 1 Januari - Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract Several activities in the Bakuok Lake contribute the input of organic and inorganic matters to the waters, and thus increase the concentration of nitrate and phosphate in the water. A research aims  to  understand the relationship between organic matter and  nutrients (Nitrate and Phosphate) in the Bakuok Lake has been carried out in June-July 2019. There were three stations namely station 1 (around the plantation area), station 2 (in the middle of the lake) and station 3 (around the net cage area).  Each station has 2 sampling points namely the surface and 2 Secchi depth. Sampling was done 3 times, once/week. Water quality parameters measured were biochemical oxygen demand, dissolved oxygen, free carbon dioxide, nitrate, phosphate, temperature, transparency, pH, and ammonia. The water quality value were as follows: biochemical oxygen demand 4.80-6.32 mg/L, dissolved oxygen 6.57-7.54 mg/L, carbon dioxide 9.37-13.86 mg/L,  nitrate 0.0207-0.0319 mg/L, phosphate 0.0385-0.0553 mg/L, temperature 29.3-31.3oC, transparency 58-87 cm, pH 5, and ammonia 0.0132-0.0165 mg/L. The relationship between organic matter with nitrate and phospate was 0.96 or very strong.Keywords: Oxbow Lake, Nutrients, Water Quality
Limnological Condition of Koto Tibun Reservoir, Kampar District, Riau Province Based on Physical - Chemical Parameters Ricky Christoper P. S; Asmika H. Simarmata; Clemens Sihotang
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract Koto Tibun Reservoir is one of the reservoirs that exist in Riau Province precisely on the road crossing Pekanbaru-Bangkinang km. 43, Kampar District. These reservoirs are used for agriculture irrigation, aquaculture water supply and other needs. The research aims to understand the limnological condition in the Koto Tibun Reservoir based on physical – chemical parameters was conducted from February - March 2018. There are 3 stations, namely Station 1 (riverine zone), Station 2 (transition zone), and Station 3 (lacustrine). Sample were taken once/week for a 3 weeks period. Water quality parameters measured were temperature, transparancy, depth, water current, DO, CO2 free, pH, nitrate and phosphate concentration. Result shown that the temperature was 25,3 - 25,6 0C, transparancy 75 - 79 cm, depth 3,11 -  3,54 m, water current 0,16 - 0,40 m/second, DO 4,78 - 5,62 mg/L, CO2 free 18,64 - 19,44 mg/L, pH 5, nitrate 0,186 - 0,193 mg/L and phosphate 0,093 - 0,113 mg/L.  Based on nitrate and phosphate concentrations in Koto Tibun Reservoirs waters can be categorize oligotrophic and mesotrophic - eutrophic conditions.Keyword : Koto Tibun Reservoir, Aquaculture, Water Quality, Trophic Status
Extensive fishing Carrying Capacity oftheFPK Reservoir, Riau University Based on Chlorophyll-a Ayunanda Mustika Sari; Asmika Harnalin Simarmata; Madju Siagian
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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ABSTRACT               Carrying capacity is defined as the ability of aquatic environment to support the life of organisms in that area. A study aims to assess the extensive fishing carrying capacity of the FPK reservoir based on primary productivity (chlorophyll-a content), has been conducted in November-Desember 2018. There were 3 stations, namely Station 1 (inlet area), Station 2 (in the middle of the reservoir) and Station 3 (outlet area). Water quality parameters measured were temperature, transparency, pH, dissolved oxygen, CO2, nitrate, phosphate, and chlorophyll-a concentration. The concentration of chlorophyll-a indicates that the extensive fishing’s carrying capacity of the reservoir was 0.31 tons/year. Water quality parameters were as follows: transparency ranges from 66.7-106.8 cm, temperature   28-29°C, pH 6, dissolved oxygen 2.52-2.66 mg/L, free CO2 6.7-9.83 mg/L, nitrate 0.3667-0.4118 mg/L, phosphate 0.2080-0.2154 mg/L, and concentration of chlorophyll-a was 12.78-15.96 µg/L. Keywords:Carrying capacity, Produktivitas Primer, Fitoplankton, Reservoir, Water quality
The Dynamics of Fitopankton Abundance Lake Tepian Batu Teratak Buluh Village, Kampar Regency Riau Province Magdalena Fitriani Daeli; Madju Siagian; Asmika Harnalin Simarmata
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 7, No 1 (2020): Edisi 1 Januari - Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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                                           Abstract The research of phytoplankton abundance dynamics conducted in June-July 2019 at Lake Tepian Batu. A study aims to know the dynamics of phytoplankton abundance. There were 3 stations namely stasion 1 (inlet area), station 2 (in the middle of the lake) and station 3 (in the end of the lake). In each stations, there were 2 sampling point, in the surface and 2 Secchi depth. Sampling was done 4 times, once/week. Water quality parameters measured were temperature, pH, transparency, dissolved oxygen, free carbondioxide, nitrate, phosphate.Result shown that, temperature 28.75-30.50C, pH 5-5.5, transparency 56.5-63.7 cm, DO 3.13-5.35 mg/L, CO26.00 -12.99 mg/L, nitrate 0.031-0.075 mg/L, phosphate 0.062-0.116 mg/L, phytoplankton abundance at the surface range106,990-258,422 cell/L, and 2 Secchi depth range101,229-153,901 cell/L. Temporal and spatial dynamics of phytoplankton at Lake Tepian Batu were influenced of water quality dynamics such as transparency, nitrate and phospate concentration. Keywords:Dynamics, Phytoplankton, Water Quality, Lake Tepian Batu
Periphyton Community on the Ceramic Substrate Around the Floating NetCage PLTA Koto Panjang Reservoir Kampar Regency Riau Province Beta Posmarito Pardede; Tengku Dahril; Asmika Harnalin Simarmata
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 8, No 2 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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ABSTRACT Periphyton is microorganism that live attached to submerged substrate. In the vicinity of Koto Panjang Dam Site there are fish farming activities in floating net cages, which produce feed residu and metabolic waste. This research aims to determine periphyton community around the Dam Site of the Koto Panjang Reservoir. This research was conducted in December 2020. There were 3 stations, namely station 1 (less KJA), station 2 (moderate KJA), and station 3 (full KJA). The subtrate used is ceramic substrate with a size (8x3 cm2). Substrate was planted 1 week before sampling. Sampling were conducted 3 times at once a week. The periphyton samples were obtained by spraying the surface of ceramic substrate with aquadest using a plastic sprayer. Periphyton were preserved with lugol 1%, then identified and abundance counted. Water quality parameters measured were temperature, transparency, pH, dissolved oxygen, free carbondioxide, nitrate, and phosphate. Results shown that there were 36 types of periphyton, belongs to 7 classes, namely Bacillariophyceae (6 types), Chlorophyceae (17 types), Cyanophyceae (3 types), Trebouxiphyceae (4 types), Zygnematophyceae (4 types), Euglenophyceae (1 type), dan Dinophyceae (1 type). Periphyton abundance during the study ranged from 2.479-10.357 cells/cm2. Two way anova test on the number of species and periphyton abundance around the Dam Site of PLTA Koto Panjang Reservoir showed that the number and abundance of periphyton were not significantly diffrerent between stations and between times. Keywords:Periphyton, PLTA Koto Panjang Reservoir, Ceramic Substrate, Net       Floating Cage, Water Quality 
Trophic status of the Bandar Kayangan Lembah Sari Reservoir, Rumbai Pesisir Sub-district, Pekanbaru Based on Nitrate and Phosphate Concentration Berton Panjaitan; Asmika Harnalin Simarmata; Madju Siagian
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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as a basis to determine the trophic status of the waters. A research aims tounderstand the trophic status of the waters of the Bandar Kayangan Lembah Sarireservoir was conducted in Mach-April 2016.There were 4 stations, namely St 1 (in theinlet from Ambang River), St 2 (in the inlet from Merbau River), St3 (in the middle ofthe lake) and St 4 (in the dam). Samplings were conducted 3 times, once/ week. Watersamples were taken from the water surface.Results shown that nitrate concentration was ranged from 0.075 – 0.096 mg/L,phosphate from 0.208 – 0.293 mg/L, temperature 31-32°C, transparency 56.8 – 60.2 cm,depth 219.3 – 378.7 cm, velocity0.25 – 0.40 cm/s, pH was4, dissolved oxygen (DO)5.38 – 8.31mg/L. Based on nitrate concentration, the trophic status of the BandarKayangan Lembah Sari reservoir was categorized as oligotrophic, whereas based onphosphate concentration, it can be categorized as eutrophic.Keyword: trophic status, nitrate, phosphate, Bandar Kayangan Lembah Sari lake
Types and Abundance of Phytoplankton in Tanjung Kudu Lake and Parit Lake, Tambang District, Kampar Regency, Riau Province Rekha Mutiara Manurung; Asmika Harnalin Simarmata; Tengku Dahril
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 8, No 1 (2021): Edisi 1 Januari s/d Juni 2021
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 ABSTRACTPhytoplankton is primary producer and as well as natural food and has an important role in the water. This research was conducted in December 2020 in Tanjung Kudu Lake and Parit Lake. There were three stations, namely Station 1 (inlet), Station 2 (in the middle of the lake), and Station 3 (end of the lake). Sampling was done 3 times one/week. Water quality parameters measure were temperature, transparency, depth, pH, dissolved oxygen, CO2, nitrate, and phosphate. Result shown there were 26 types of phytoplankton in Tanjung Kudu Lake, and 29 species in Parit Lake. The abundance of phytoplankton in Lake Tanjung Kudu was 18,720-37,700 cells/L, and the abundance of phytoplankton in Lake Parit was 19,760-45,500 cells/L. Water quality parameter such as transparency 48.5-59 cm, temperature 29.3-29.6oC, pH 5.3-5.8, dissolved oxygen 3.42-4.57 mg/L, CO2 11.98-13.98 mg/L, nitrate 0.035-0.038 mg/L and phosphate 0.027-0.048 mg/L in Lake Tanjung Kudu where as in Lake Parit the transparency was 59-65.67 cm, temperature 29.3-9.8oC, pH 5-6, dissolved oxygen 4.19-5.18 mg/L, CO2 10.66-13.32 mg/L, nitrate 0.03-0.04 mg/L and phosphate 0.036-0.039 mg/L. Based on the abundance of phytoplankton, Lake Tanjung Kudu and Lake Parit can be categorized as mesotrophic.Keywords: Phytoplankton, Water Quality Parameters, Tanjung Kudu Lake, Parit Lake, Mesotrophic
Study of Periphyton on Glass Substrates in Sago River Pekanbaru Prian Mintaito Simangunsong; Madju Siagian; Asmika Harnalin Simarmata
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Periphyton is a group of microorganism that grow in some natural substrates such as rock, wood, plants and aquatic animals.A research aims to understand the type and abundance of periphyton in the Sago River has been carried out in April-May 2015. Samples were taken from three station, once/ week for a 4 weeks period. Type of periphyton was identified based on Prescot (1974), and Yunfang (1995). Result shown that there are 39 types of periphyton and they are belonged to 8 classes, namely Bacillariophyceae (13 species), benthic Crustacean (1 species), Chlorophyceae (6 species), Cyanophyceae (8species), Cryptophyceae (3species), Dinophyceae (4species), Euglenophyceae (2 species) and Xanthophyceae (2 species).The abudance of periphyton in the all station Sago River is significantly different, there were S1 (7,533cells/cm2), S2 (10,206cells /cm2), and S3 (13,277cells /cm2). The abundance of periphyton in the Sago River in general was around 7,533– 13,277 cells /cm2.Keywords: Sago River, Periphyton, Glass Substrates
Carrying Capacity for Extensive Fishing Based on Chlorophyll-a in The Tuok Tonga Lake, Buluh Cina Village, Siak Hulu Sub District, Kampar District, Riau Province Yeni Handayani; Madju Siagian; Asmika Harnalin Simarmata
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 7, No 1 (2020): Edisi 1 Januari - Juni 2020
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AbstractCarrying capacity is defined as the ability of aquatic environment to support the life of organism in that area. A study aimed to assess the aquatic carrying capacity based on chlorophyll-a for extensive fishing in the Tuok Tonga Lake, Buluh China Village,Siak Hulu Sub District, Kampar District, Riau Province.The carrying capacity was determined based on primary productivity using chlorophyll-a concentration, which is indicating the existence of phytoplankton in the water. This research was conducted in June-July 2019. There were 3 stations, namely Station 1 (inlet area), Station 2 (in the middle of the lake) and Station 3 (in the end of the lake). In each stations, there were two sampling point, in the surface and in 2 Secchi depth. Sampling was done three times once/week. Water quality parameters measured were chlorophyll-a, temperature, transparency, depth, pH, dissolve oxygen, CO2, nitrate and phosphate. Results shown that chlorophyll-a: 14.03-17.07 μg/L, transparency: 61.7-62.3 cm, temperature: 29.3-31oC, depth: 125-284 cm, pH: 5, dissolved oxygen:  3.37-4.94mg/L, CO2:5.32-11.98mg/L, nitrate: 0.02-0.08 mg/L and phosphate: 0.04-0.1mg/L. Based on concentration of chlorophyll-a indicates that the carrying capacity of the Tuok Tonga Lake for extensive fishing was 0.85 tons/year.Keywords: Oxbow lake, Primary productivity, Water quality
Co-Authors ', Edduardo Abdi Doly Tarigan Adithia Netanyahu Purba Agung Prabowo Agustri Minggu Samosir Minggu Samosir Ali Akbar Navis Amat M. Siregar Amat Marustar Siregar Andri Hendrizal Arico Candra Tambunan Astria, Katarina Gita Ayunanda Mustika Sari Azmudin ' Bennawaty Bennawaty Berton Panjaitan Beta Posmarito Pardede Bibiana W. Lay Br Sitorus, Chrisna Heni Nozelina Br. Allagan, Desima Kristina Buala Ziduhu Laia Budijono, Budijono Christin M. Saragih Cindy Fantika Sari Clara Novicasari Br Surbakti Clemen Sihotang Clemens Sihotang Cristy Artha D Sinurat D Kusumawati, Yuliana Dameyana S.C Lumban Tobing Darwinda Darwinda Dasti Janarko Putra, Dasti Janarko Defi Fitriya Dalimunthe Deni Efizon Desi, Ria Irawan Dewi, Afrila Diah Sari Ninggrum Dimas Dwi Nugroho Santoso Dio M Silalahi Dumaria, Roma Efredy Tamba Eka Dwinata Nopitasari Eko Purwanto Eko Simatupang Ella Dabella Manja Enan M. Adiwilaga Erwin David Sianipar Esmi Yanti br Sinaga Fadilah, Nisa Wangi Tresna Fahrezzy, Reggi Farida Sri Indah Ginting, Dinda Julianti Gultom, Zogi Tri Harjoyudanto, Yudho Hendra Saputra Henni Syawal Hidayati Hasibuan Hidayatunnisah, Putry Hikma, Murbeni Hosianna Sitorus Indra R. Simangunsong, Indra R. Indradewa, Rhian Irfan Anggriawan Irwan Nababan Isma Mulyani Jerima, Raihan Jiboro, Mega Rani Joko Samiaji Juliana Ivana Siregar Julianti ' July Prenky Purba Krismanto Viade Nababan Libra Trio Situmorang, Libra Trio Lubis, Helfrida M Silalahi, Dio M. Arifan Fadhilla M Madju Siagian Madju Siagian Madju Siagian Madju Siagian Madju Siagian2 Magdalena Fitriani Daeli Maju Siagian Mandasari, Ayu Defi Manurung, Dostiarni Minsa Karolina Maria Virgita Sihaloho, Maria Virgita Merlin Evan Olivia Hutauruk Miranda Wahyuni Raja Gukguk Muhammad Edom Rifai Muhammad Zaki Mulyani, Isma Munthe, Ayaki Tomala Nadia Putri Julita Nadira, Ismi Nainggolan, Dorma Abigail Natasya Margareth Pasaribu Nia Anggraini Nugroho, Rio Cahyo Nuraini El Fajri Nurrina, Haura Olivia, Reyka Kristin Petrus Juandatua Sirait, Petrus Juandatua Prakoso, Dodo Prian Mintaito Simangunsong Putra, Aldo Pratama Radieka Febyando, Radieka Rahmi Hidayana Hasibuan Raihan Jerima Rancelia Kristina Simanjuntak Rati Muspa Rekha Mutiara Manurung Renny Sibuea Ricki Meno P Sinurat Ricky Christoper P. S Rina D’rita Sibagariang Rina Maria Rini Sinaga Rodo Sinatra Nababan, Rodo Sinatra Roma Dumaria S Sinaga, Jefri Daniel Santo Rio Pakpahan Santoso, Dimas Dwi Nugroho Santun Tua Siburian Satria Yunda Sembiring, Rinawati Septriza Radella Shinta Permata Sari Siahaan, Oloan Sibagariang, Rina D'rita Sibagariang, Rina D’rita Sibuea, Renny Sihombing, Djob Fernadi Sihombing, Evi Stevani Sihombing, Susi Silaen, William Fransisco Simangunsong, Perdinan Simanjuntak, Taruli Septiana Sistim Wehalo Sitohang, Dohar Sitorus, Rike Yance Sofyan Husein Siregar Sovianti, Yona Syada Nopriadi Akbar Tamba, Niger Efafras Tengku Dahril, Tengku Theresia Tifany Saragih Tiara Priskila Tri Prartono Tri Wahyudi Triani, Mike Tuti Maisarah Br. Siregar Valentina Manurung Walmon Sinaga Windarti Windarti Windarti Windarti Yeni Handayani Yona Sovianti Yudho Harjoyudanto Yudi Asriansyah Yuli Suciati Yuni Piratih, Yuni Yunita, Sarah Amelia Yuris Fiestaria Naibaho Yusmidar Yusmidar Zaini Hafiz Zein Lubis, Solat Adawiyah