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Efriyeldi, Efriyeldi
Fakultas Perikanan Dan Kelautan, Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Public Health Social Sciences Other

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Kandungan Logam Berat Pb, Cu, Zn Pada Daging Dan Cangkang Kerang Hijau (Perna Viridis) Di Perairan Tanjung Balai Asahan Andrew ST OS; Yusni Ikhwan Siregar2; Efriyeldi '
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

Penelitian ini dilaksanakan pada bulan Januari 2014. Metode yang digunakan adalah metode survei, dimana perairan Tanjung Balai Asahan dijadikan lokasi pengamatan dan pengambilan sampel kerang hijau. Penelitian ini bertujuan untuk menganalisis kandungan logam berat Pb, Cu, Zn pada daging dan cangkang kerang hijau (P. viridis) berdasarkan ukurannya, mengetahui perbedaan kandungan logam berat Pb, Cu, Zn antara daging dan cangkang, mengetahui hubungan kandungan logam berat Pb, Cu, Zn pada daging dan cangkang dengan ukuran kerang hijau dan mengetahui tingkat kelayakan konsumsi kerang hijau dari perairan Tanjung Balai Asahan. Kandungan logam berat berdasarkan bagian tubuh diketahui bahwa kadar Pb, Cu, Zn lebih tinggi terdapat pada cangkang dibandingkan daging. Kandungan Pb yang terdapat pada daging berbeda menurut ukuran tubuh tertinggi terdapat pada daging ukuran kecil (1,17 μg/g), Cu pada daging ukuran sedang (8,72 μg/g) dan Zn terdapat pada daging ukuran besar (295,93 μg/g). Kandungan Pb cangkang lebih tinggi pada ukuran sedang (10,10 μg/g), Cu tinggi pada ukuran kecil (17,90 μg/g) dan Zn tinggi pada ukuran besar (680,85 μg/g). Berdasarkan perhitungan PTWI yang didapat maka kerang hijau dari perairan Tanjung Balai Asahan masih dapat dikonsumsi selama tidak melampaui batas yang talah ditetapkan.Kata kunci: Logam Berat Pb, Cu, Zn; P. viridis; Tanjung Balai Asahan
ABUDANCE AND DISTRIBUSION PATTERN OF GASTROPOD AT INTERTIDAL ZONE KALANGAN COAST TAPANULI TENGAH SUMATERA UTARA PROVINCE Judika Nursiani Sipahutar; Efriyeldi Efriyeldi; Aras Mulyadi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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ABSTRACTCoastal ecosystems are the confluence of land and sea that are still influenced by sea characteristics such as tides, sea breezes and salt intrusion and sedimentation processes.The intertidal zone is part of a coastal ecosystem in which many marine biota live such as the gastropods of the mollusk phylum. The purpose of this study was to determine the type and abundance as well as the distribution pattern of gastropods in the intertidal zone of Kalangan Beach in Central Tapanuli, North Sumatra. This research was conducted in April 2019. From the results of the study it was found that in the intertidal zone of the Kalangan Beach 10 gastropods were found, namely Clypeomorus sp, Littorina sp, Polinices, Clypeomorus bifascita, Nassa francolinus, Morula granulata, Phasianella solida, Clypeomorus batillariaeformis, Cerithiium sp,and Faunus ater. At station I with an abundance of 5 ind / m2 which is relatively low. At station II with an abundance value of 2 ind / m2 classified as very low, and at station III with an abundance value of 43 ind / m2 classified as abundant. The distribution pattern of gastropods in the intertidal zone of Kalangan Beach at each station is clustered. Keywords:gastropods, abundance, distribution pattern 
SHORELINE CHANGEBY USING SATELLITELANDSAT IMAGEATRANGSANG BARAT DISTRICT OF MERANTI REGENCY RIAU PROVINCE Putri Rifdayati; Musrifin Galib; Efriyeldi Efriyeldi
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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                                                 AbstrakShoreline changes isprocesses of accretion and abration, triggered due to natural and human activities factors in coastal areas.This research wasconductedat April 2018 in the coastal district of West Rangsang District of Meranti Islands.This research was aimed to determinewide and rate of shoreline changeby using satellite landsat imageat 2002 until 2018 with DSAS 4.3 (Digital Shoreline Analysis System). The research used surveymethod  and determination of sampling location by purposive sampling. Measurement of physical parameters is done in situ. The analysis of shoreline changes using 4 Landsat images (2002, 2007, 2015 and 2018) at DSAS approachs with the NSM (Net Shoreline Movement) for distance change and EPR (End Point Rate)for the rate of change. Shoreline changes in West Rangsang district are influenced by strong wave of Malacca Strait, during the last 16 years there has been accretion in seigomeng, melai, part of bantar andanak setatah village, with the highest average accretion rate of 8.88 m / year, mean distance change 138.1 m and the area of change 108 Hecktar and abrasion in the village of Permai, part of Bantar village and children setatah with average highest abrasion rate 4,93 m / year with mean distance change 76,6 m and area 1101 Hecktar. The wave energy is 2.94 until 4.9 Nm / m2 and the current velocity is 0.40 until 0.50 m/s with the flat beach tipe.Keyword: Shoreline Changes, Rangsang Barat, Accretion, Abration, Landsat image, DSAS
CHARACTERISTICS NESTING BEACH OF GREEN TURTLE (Chelonia mydas) IN CHAGAR HUTANG REDANG ISLAND TERENGGANU MALAYSIA Muhammad Rizky Rinaldi; Efriyeldi Efriyeldi; Syafruddin Nasution
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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ABSTRACT Green turtle (Chelonia mydas) is one type of reptile that is protected because endangered. This research was conducted in March-April 2018 in the Chagar Hutang of Redang Island, Terengganu, Malaysia. The purpose of this study is to determine the characteristics of the nesting beach of green turtle(C. mydas). The method used in this study is the survey method. There are 3 observation stations, station 1 located in a location that has little vegetation and there is a tide pool around the station. Station 2 is located in a dense vegetation and has a gentle slope category. While station 3 is located in an area near the less and the has less dense vegetation. The slope of the beach at each station were measured. Characteristics of nesting beaches include the slope, width,flora and fauna, the type of substrate, air temperature and sea water temperature. The  results of the study showed that the slope of these coast ranged from 3.65 to 5.35˚ classified as sloping. The width of the beaches were quite wide, ranged 26.47-36.46 meters. The common vegetation consist includes ketapang (Terminalia cattapa), sea pandanus (Pandanus tectorius) and babakoan (Scaevola raccada). While the common fauna includes ghost crab (Ocypodinae), monitor lizards (Varanus), fire ants (Solenopsis), hermit crabs (Paguroidea), and various types of corals (Coral). The type of substrate was gravel sand with air temperature in the range of 27-29ºC, while the sea water temperature was in the range of 28-29ºC. Keyword: Cheloniamydas, Characteristics Nesting Beach, Chagar Hutang
C-ORGANIC CONTENT IN THE SEAGRASS LEAF ON DIFFERENT KINDS SEAGRASS OF ISLAND PONCAN IN SIBOLGA, NORTH SUMATERA PROVINCE Yohanna Siagian; Zulkifli '; Efriyeldi '
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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This research was conducted from March to May 2017, at Poncan Island. This study aims to determine the content of organic carbon in the leaf seagrass on different species in the waters of Poncan Island, Sibolga, North Sumatera. Tools and materials used in the field are transect rope, thermometer, pH Indicator, secci disk. The tools used in the laboratory are alluminium foil, oven, furnace, analytical scales and materials used in the laboratory is seagrass, sediment and H2O2 samples. This method uses the Survey method. The organic carbon content was analyzed by the method of sampling and the data was processed using the t-test. The results show the dock area and the area affected by the highest C-organic waste waste in the H. unninervis species. In mangrove areas and areas where there is no highest C-organic human activity is found in C. rotundata speciesKeywords : C-Organic Content, Poncan Island
STUDY OF MARINE ECOTOURISM POTENTIAL IN TURELOTO BEACH REGENCY NORTH NIAS NORTH SUMATERA PROVINCE Angelia E Bernike Zebua; Dessy Yoswaty; Efriyeldi '
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Ecotourism is a tourist trip to a natural region in order to conserve or save the environment and provide welfare to the local population. This research was conducted in February-March 2017 at Tureloto beach, North Nias, North Sumatera Province. The study aims to determine the potential of marine ecotourism and aspects of the strength of Tureloto beach to be developed as a marine ecotourism area. The method used in this research is survey method and station point determination by purposive sampling. Mainland coastal Tureloto is the result of removal of the seabed one to three meters above sea level due to the earthquake that occurred in 2005. Value of Travel Assessment Index that is on Station I, II, III and IV is 79.5%, 89.1%, 76.3% and 64.1% respectively. Assessment of strengths, weaknesses, opportunities, and threats, the development of Tureloto's coastal potential is assessed from observations at research sites, interviews and questionnaires. Tureloto Beach has the potential as a marine ecotourism area such as pristine, natural and exotic natural beauty, marine biota and various coral reefs, history of coastal geology, waters conservation zonation system as well as research resources. Aspects of Tureloto's coastal strengths are, empowerment of local communities and on the coastal can be added a place to relax.Keyword: Potential, Marine Ecotourism, Tureloto Beach
Analysis of bacteria clostridium perfringens on Tembakul (periopthalmodon schlosseri) in the coastal Waters of the district of west dumai Indra Bayu Pratama; Dessy Yoswaty; Efriyeldi '
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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The experiment was conducted in November 2013 in the coastal waters ofthe Western District of Dumai. The method used in this study is a survey method,with the observation, measurement and sampling in the field. This study aims toanalyze the distribution of C. perfringens bacteria on tembakul in coastal watersof the District of West Dumai. Tembakul obtained around the mangrove forest inthe Purnama Village, which is divided into 3 stations namely Masjid estuary,mangrove forest on the Dermaga Street and Surrounding Fish Auction (TPI).Observations quality of coastal waters such as temperature, acidity (pH), andsalinity were measured directly at each sampling location. The results of thecalculation of C. perfringens bacteria analysis on tembakul (Periopthalmodonschlosseri) at three stations in the coastal waters of the District of West Dumairanged from 4.0 x 104 to 2.0 x 106 cfu / ml. Coastal waters of the District of WestDumai is still below the bacteriological contamination threshold, where theaverage total C. perfringens bacteria on fish that pass tembakul no threshold106 cfu/ml, which can lead to illness or poisoning the marine fishery products inDumai.Keywords : Dumai,Clostridium perfringens,Periopthalmodon schlosseri,Analysis
POPULATION STRUCTURE AND HABITATCHARACTERISTICS OF HARD CLAM (Meretrix meretrix)IN INTERTIDAL ZONE OF SUNGAI CINGAM VILLAGE OF RUPAT SUB DISTRICT OF BENGKALIS REGENCY Kristoper Aritonang; Syafruddin Nasution; Efriyeldi Efriyeldi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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ABSTRACTHard clam (M. meretrix) is bivalve that lives in the bottom of a water substrate that is a filter feeder. This research was conducted in July 2018 in the intertidal zone of Sungai Cingam Village, Rupat District. This research aims to knowhabitat characteristics, abundance, distribution patterns and size distribution of M. meretrix. The method used in this study was the survey method and determination of sampling location by purposive sampling. Measurements of water quality parameters weredone in situ, namely temperature, salinity and pH. The results showed that the type of substratewas muddy sand and organic mattersare classified as low. Suspended solids have not exceeded sea water quality standards. Water quality parameters were still supported for the life of aquatic organisms. The abundance of M. meretrix population was low, which was1.38 ind/m2. The distribution pattern was random and uniform which is dominated by classes measuring 54.6-63.6 mm from 6 size classes.Keywords: Meretrix meretrix, Abundance, Distribution, Size.
MAPPING OF MANGROVES CHANGE AREA AND THE DENSITY OF MANGROVE IN ANAK SETATAH VILLAGE SUB-DISTRIC OF RANGSANG BARAT DISTRICT OF KEPULAUAN MERANTI RIAU PROVINCE Halida Sisda Harahap; Elizal Elizal; Efriyeldi Efriyeldi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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ABSTRACT This research was conducted in February 2019 in Anak Setatah village, Sub-distric of West Rangsang, District of Kepulauan Meranti, Riau Province and was aimed to find out the change of area and the density of mangrove this time. The research was conducted by survey method. The quantitative method was used on the change of mangrove forest area observation. The result of image data processing showed that mangroves area in Anak Setatah Village had decrease of area in 2006-2011 about 3.77 ha and there was an increase of area in 2011-2016 about 116.88 ha. The density of mangrove in Anak Setatah Village has the tight and medium density type. According to Mangrove Quality Standards, the density are still in Good category.  Key words : Mangrove, Change of Area, Density, Anak Setatah
Comparative Morphometric Rhizophora Apiculata Leaf And Fruit In Two Areas With Anthropogenic Activities Different In Pesisir Dumai Barat Kota Dumai ProvinsiRiau David Raymond Sianturi; Efriyeldi Efriyeldi; Aras Mulyadi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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ABSTRACTMorphometrics is a field that deals with variations and changes in the form (size and shape) of an organism or object. Anthropogenic is a human activity not only limited to the use or utilization of coastal resources, but also can be restorative and protective, thus causing complex disruption. The purpose of this study was to determine the morphometric differences of the leaves and fruits of R. apiculata mangroves in two regions with different anthropogenic activities in the mangrove ecosystem of Dumai City. This research was carried out in May 2019. From the results of the study it was found that in areas polluted by anthropogenic activity the average morphometrics of fruit (length and width) and leaves (length, width and length of the stems) Rhizophora apiculata were lower than those in the area not polluted by anthropogenic activity. At station I the oil content ranged from 1162.11 to 1934.2 ppm classified as polluted and at station II ranged from 672.81 – 1082.30 ppm classified as not polluted. The content of organic matter at station I ranged from 11.03 to 13.73%, which was classified as low, while at station II it ranged from 19.95 to 23.77% which was classified as moderate. Keywords:Dumai, Anthropogenic, Mangrove, Morphometric
Co-Authors ', Zefendra ', Zulkifli AA Sudharmawan, AA Abdullah, Ikhlas Abiyu Rohid Adani Fatahilal Arifin Adila, Melin Adiyatma, Patwa Afrizal Tanjung Agnesia, Yohana Agus Mandar, Agus Agus Sutikno Agusti, Dianda Roaana Agusti, Dinda Roanna Ahmad Pasmuji Ahmadryadi_ahmadryadi Ahmadryadi_ahmadryadi Akmal Hawari Alfiana, Dewi Alghani, Muhammad Roif Alpian Alya, Alya Ananda, Nahdya Nasri Andreas Situmorang Andrew ST OS Andri Hendrizal Andrito, Wahyudi Angelia E Bernike Zebua Anggina, Viona Novi ani ani Anugrah, Muhammad Dea Aprizon Putra Aras Mulyadi Arbianti, Purnama Ardiana, Eka Ariaz, Panji Ahmad Arif Rahman Hakim Arifin, Adani Fatahilal Arlius Arlius, Arlius Arniati, Dina Asma Husna Putri Asma Ul Husna Putri Ayuni, Putri Bagas Ariya Pambudi Bahari, Sandy Batubara, Ummi Mardhiah Bintal Amin Bona Juandi Bonawi Sihombing Bonita Tiolina Exaudi Budijono, Budijono Burhan Marbun Cahyo, Bintang Dwi Cut Shifa Nedi Dame, Jupparoh Caisar Van Dandi Arianto Pelly David Raymond Sianturi Dedi Afandi Defri Yoza Dela Haryani Dermawan, Ernanda Putra Desmarina, Y. Despela, Despela Dessy Yosswaty Dessy Yoswaty Dessyka Febria, Dessyka Destriana Destriana Dewi Alfiana Dewi, Delviana Dianda Roanna Agusti Dietriech Geoffrey Bengen Doni Gunawan Tampubolon Dwigantara, M. Fadhol Eko Prianto, Eko Elfind Laoli Elfis Suanto Elizal, Elizal Endi Setiadi Eni Sumiarsih Enny Herawaty Simamora Erick Palatema Esti Nur Rahayu Esti Nur Rahayu Exaudi, Bonita Tiolina Fachry Abda El Rahman Fajriani Ananda Fajriani, Annisa Farona, Fella Fazli Pasha Amri Febrianto Roby Mukhti Fernando, Muhammad Zebi Fia Novianty Fitria Roza Fitriani, Ersa Friska Maulidah Fuadi, Indra Gavion Roston Sitepu Ginting, Dya Indriati Br Ginting, T.B. Gita Purnama Sari, Gita Purnama Gusfi, Melly Hadi Sastranegara Hadiyatma, Patwa Halida Sisda Harahap Hanryani, Putri Hapzi Ali Harahap, Anugrah Setiadari Hardianto Andita Harry Leonardo Barutu Hasan, Masyhuda Hasanah, Siti Umiyatul Hasyim, Ardhan Fadhlani Hendra Taufik Herrys V Silalahi Hersa, Tania Hesty Widyaningsih Homsatun, Nuning Hutomo, Ragil Tribhakti Ida Ayu Putu Sri Widnyani Ikhsan Setiawan Ilham hidayat Ilham Ilahi Imanuel, Andrean Nggara Imran , Imran Imran Imran Indra Bayu Pratama Indradewa, Rhian Inel Vivi Elvia Inka Wahyuni Intan, Selpia Irvina Nurachmi Irwan Effendi Iskan Fami Jumaidi Isnaini, Siti Joko Samiaji Josua Simanjuntak, Josua Judika Nursiani Sipahutar Jufri Jufri Jufri Jufri Junika Cecelia Putri Jupri, Tahany Nur Fadhilah Jupri, Tahany Nur Fadhillah Kaharudin, Zakaria Karnila, Rahman Karnila Kartina ' Khairunnisa Khairunnisa Khawarizmi, Dannes M. Kholida, Azzahra Kristoper Aritonang Laila Langsana Laksono Trisnantoro Langsana, Laila Laoli, Elfind Lee, Seung Hun Lianov, Dea Lieng, Lieng Lubis, Abdillah Lucky Syarif M, Ridwan Rafsyanjani. M. Fadhol Dwigantara M. Subkhan Riza Maria Erna Martha, Rezky Dwi Matondang, Ridwan Rafsyanjani Maulana, Agung A. Mayrany, Sri Eva Meitasuri, Gevi Mia Fatma R Miswadi Miswadi Mubarak Mubarak Mubarak Mubarak Muhammad Aulia Rahman Muhammad Farhan Muhammad Rafsan Zain Muhammad Rizki Fadly Muhammad Rizky Rinaldi Muhammad Rusdi Muhammad Sabirin Muhammad Syarif Muhammad Zebi Fernando Muhammad Zebi Fernando Muhammad Zulkifli, Muhammad Mukhlis Alfarys Musrifin Galib Musrifin Ghalib Musrifin Musrifin Nababan, Sitty Mey Nabila, Chici Nabilah Jauharah Nadeak, Paulinus Nadida, Putri Nadiyatus Sholihat Nadratul Jamila Nasution, Fadli Ripai Nasution, Muhammad Rasid Naufal Sidqi Nawari Nawari Nawari Nawari, Nawari Noel GM Situmorang Novia Suci Yanti Novri Ditama Syafni Nuning Homsatun Nurafni, Melia Nurmalahayati, Yasinta Nursyirwani, Nursyirwani Oktari, Mela Oktaria, Rusiani Pambudi, Bagas Ariya Panggabean, Iis Panggabean, Iis Apriati Panji Ahmad Ariaz Patwa Hadiyatma Paul Rozeki Sinaga Pohan, Rizal Suardiman Pramita, Wisnu Pratama, Muhammad Dandy Syifa Prayitno, Betari Erlinda Putri Ayuni Putri Rifdayati Putri, Dinda Maharani Putri, Rahmi Putri, Rahmi Delima Putrianfi, Nadhifah Asilah Rafsyanjani M, Ridwan Rahma Eka Putri Rahmadhani, Tami Fitri Rahmi Susanti Rahmita, R. Raja Rahmita Ramadani Safitri Ramadhan, A.R Ramadhan, A.R. Ramadhan, Muhammad Farizqy Rangga Wardana Rasoel Hamidy Razid, Muhamad Renata, Vivien Reny Cristina Naibaho RIDWAN AFFANDI Ridwan Manda Putra Rifaldi Rifaldi, Rifaldi Rifardi Rifda Syofiana R Rifdayati, Putri Rini, Yulia Sapta Rivaldi, Rahmat Rizki Dwi Yezelkiel Rizki, A. Romie Jhonnerie Ronal Kurniawan Rosiana, Kenny S. Pane, Rolis Sabirin, Muhammad Safatriani Safatriani Safitri, Winda Santi Maya Sari Saputra, Rengki Sari, D.J. Sari, Dwi Julita Sari, Lita Sari, Nova Iman Savita, Dinda Sihombing, Kelvin Simamora, Enny Herawati Siregar, , Yusni Ikhwan Siregar, Ali Mora Hadamean Siregar, Rifa Ghina Aulia Siti Anisah Siti Fatonah Siti Hasanah Siti Umiyatul Hasanah Sitorus, Tiroy Sofyan H. Siregar Sofyan Husein Siregar Sonya Marunjung P.Hsb Sri Murtin Sufaidah, Siti Nur Sujianto Sujianto Sujianto Sujianto Sukendi Sukendi Sulistio, Hendra Tri Suparno . Suzila ' Syafrhani, Wan Nabila Syafrizal Syafrizal Syafruddin Nasution Syahril Nedi Syamsiar, Syamsiar Syawfy Luthfiandra Taat Mujaid Arifin Tania Hersa Tanjung, Lismawati Tengku Mutia Smita Dwivayana Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Tri Lestari Tri Prartono Triatama, Putri Zulfa Trisla Warningsih Uswatun Hasanah Vichi Apridianti Vivien Renata Wahyu Novra Wanda Wahyudi Wahyudi Wanda Syahrian Wardana, Rangga Wulan Cempaka Sari.S Yahya Benardus Sihombing Yanti, D.H. Yehezkiel, Rizki Dwi Yeli Hartuti Yetti Elfina Yohanna Siagian Yona, Fitria Mai Yosua Afrianus P Yulinda, Emelda Yusni Ikhwan Siregar Zain, Rahmita Firda Zakaria Kaharudin Zaki, Raihan Zientika, Zientika Zulhendri Zulhendri Zulkifli ' Zulkifli Zulkifli Zulkifli Zulkifli