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THE DOMESTICATION EFFORT OF POTENTIAL CULTIVATION OF LOCAL ORNAMENTAL FISH GERMPLASM IN WATERS AROUND THE CAMPUS OF BANGKA BELITUNG UNIVERSITY Robin Robin; Endang Bidayani; Eva Prasetiyono; Ahmad Fahrul Syarif; Denny Syaputra
Akuatik: Jurnal Sumberdaya Perairan Vol 13 No 2 (2019): AKUATIK : Jurnal Sumberdaya Perairan
Publisher : Department of Aquatic Resources Management, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/akuatik.v13i2.1501

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The aims of this research were to inventorize fish species and their spatial distribution in river of UBB and to domesticate local fish of Bangka Island that have high economic value, especially those that live around the campus of Bangka Belitung University. This research have done on July to September 2019. Test material used in this study were fish and water from river in the campus of Bangka Belitung University. The research methods were survey methods and descriptive (sampling) methods. Data in this research were the form of fish and water quality. Data of fish included of length, body weight and sex with the size of sample fish separated by the length : seed fish (10-20 mm), juvenile fish (21-40 mm) and adult fish (41-50 mm). Data of water quality taken by observate the parameters, included of temperature, dissolved oxygen (DO), pH, turbidity, brightness, hardness, current speed, and water deep. Data of fish samples were analyzed by simple linear regression analysis method, while data of water quality parameter were analyzed descriptively
KERAGAAN PERTUMBUHAN DAN SINTASAN IKAN KELI LOKAL (CLARIAS NIEUHOFII) ASAL PULAU BANGKA YANG DIPELIHARA PADA SUMBER AIR BERBEDA DI TAHAP AWAL DOMESTIKASI Ahmad Fahrul Syarif; Andi Gustomi; Achmad Sigid Purnomo Aji
JFMR (Journal of Fisheries and Marine Research) Vol 4, No 1 (2020): JFMR VOL 4 NO 1
Publisher : JFMR (Journal of Fisheries and Marine Research)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (211.196 KB) | DOI: 10.21776/ub.jfmr.2020.004.01.10

Abstract

Ikan Keli Lokal (Clarias nieuhofii) memiliki nilai ekonomis yang tinggi khususnya di Kepulauan Bangka Belitung. Ikan ini berpotensi dikembangkan sebagai suatu komoditas ikan khas Bangka Belitung. Tujuan penelitian ini adalah mengevaluasi pemeliharaan ikan Keli Lokal pada sumber air yang berbeda. Penelitian ini dilaksankan pada bulan Agustus-November 2019 di Laboratorium Budidaya Perairan, Universitas Bangka Belitung dengan lama pemeliharaan 60 hari. Rancangan penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan perbedaan sumber air yang berasal dari air sumur (air bening), air alami dan campuran keduanya dilakukan sebagai perlakuan dengan masing-masing ulangan sebanyak 3 kali. Parameter yang diamati adalah keragaan pertumbuhan meliputi (panjang dan bobot) mutlak, laju pertumbuhan spesifik dan sintasan. Hasil penelitian menunjukkan bahwa ikan Keli Lokal merespon baik pada setiap sumber air yang berbeda dengan pertumbuhan bobot dan panjang mutlak yang tidak berbeda nyata (P>0,5), pada laju pertumbuhan spesifik ikan Keli Lokal merespon baik pada sumber air berasal dari air bening dan air alami, sintasan terbaik pada penelitian ini terlihat pada perlakuan air alami yaitu sebesar 67%, secara umum ikan Keli Lokal merespon positif di wadah budidaya pada tahap awal domestikasi.The Walking Slander Catfish (Clarias nieuhofii) had a hgh economic value especially on Bangka Belitung Island. This fish was potential to be developed for local comodity from Bangka Belitung. This research aimed to evaluate a Walking Slander Catfish cultured on different sources of water. This research conducted on August-November 2019 in Laboratory of Aquaculture, University of Bangka Beiltung. This research arranged by Compeletely Randomzed Design (CRD) with the different water sources as the teratments from well (clear water), natural water and mixed of (clear water x natural water). The parameter which was to observed are growth performance (weight and length) absolute, specific growth rate and surival rates. The result showed the Walking Slander Catfish had a positively response for different water sources in growth of absolute weight and length with had no significantly different (P>0,5), for specific growth rate the Walking Slander Catfish had better response on clear and natural water as the source, a good survival rate showed on natural water with value 67%, naturally the Walking Slender Catfish had a positively response cultured on early stage of domestication.
Ikan Kepait Dari Selatan Pulau Bangka Sebagai Kandidat Spesies Baru Berdasarkan Meristik Dan Gen Sitokrom b Ardiansyah Kurniawan; Ahmad Fahrul Syarif
Jurnal Media Akuatika Vol 7, No 2 (2022): April
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/jma.v7i2.24929

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AbstrakIkan Kepait merupakan salah satu ikhtiofauna yang ditemukan keberadaannya di Pulau Bangka. Ikan lokal yang juga ditemukan di selatan Pulau Bangka ini memerlukan diidentifikasi secara morfologi dan molekuler untuk memastikan taksonominya. Eksplorasi sampel ikan dilakukan di Desa Bencah, Kecamatan Air Gegas, Kabupaten Bangka Selatan. Pengamatan karakter morfologi meliputi ciri fisik dan meristik, sementara identifikasi molekuler menggunakan gen sitokrom b. Morfologi ikan menunjukkan kemiripan dengan Osteochilus spilurus pada terdapatnya bulatan besar pada pangkal ekor, linealateralis pada 29 -31 sisik, predorsal scale pada sisik ke 8-9, formula sirip dorsal D iii.12-13 dan sirip anal A.6. Namun terdapat perbedaan pada membran sirip berwarna kemerahan dan jumlah sisik linealateralis. Karakterisasi DNA gen sitokrom b menghasilkan nukleotida dengan panjang  1136 bp menunjukkan perbedaan cabang dengan Osteochilus spilurus dari  pulau yang sama pada konstruksi pohon filogenetik dengan jarak genetik lebih dari 20%. Kondisi ini memungkinkan sampel ikan dari selatan Pulau Bangka ini menjadi kandidat spesies baru dalam genus Osteochilus.Kata kunci : Osteochilus spilurus, spesies baru, Bangka Selatan, Sitokrom b.
Performa Pertumbuhan Hibrida Antara Ikan Kerapu Batik Betina (Epinephelus microdon) Dengan Ikan Kerapu Kertang Jantan (E. lanceolatus) yang Dipelihara Pada Salinitas Berbeda Ahmad Fahrul Syarif; Dinar Tri Seolistyowati; Harton Arfah
Journal of Tropical Marine Science Vol 2 No 1 (2019): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.745 KB) | DOI: 10.33019/jour.trop.mar.sci.v2i1.986

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Hibridisasi antara spesies ikan kerapu batik (Epinephelus microdon) betina dan ikan kerapu kertang (E. lanceolatus) jantan terus dikembangkan untuk memperoleh strain baru dengan performa unggul. Penelitian ini bertujuan untuk mengevaluasi performa pertumbuhan hibrida ikan kerapu “TIKTANG” (hibridisasi antara ikan kerapu batik betina x ikan kerapu kertang jantan) terhadap perbedaan salinitas 10, 20 dan 30 ppt pada beberapa parameter pertumbuhan panjang dan bobot. Percobaan dirancang menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan perbedaan salinitas dan masing-masing diulang tiga kali. Pemeliharaan dilakukan selama 21 hari dengan metode pemberian pakan at satiation. Hasil penelitian menunjukkan bahwa derajat kelangsungan hidup ikan kerapu hibrid “TIKTANG” selama pemeliharaan sebesar 100%, sedangkan performa pertumbuhan baik panjang maupun bobot menunjukan perlakuan 10 ppt lebih rendah dibandingkan 20 dan 30 ppt (p<0,05). Hibridisasi antara spesies ikan kerapu batik (Epinephelus microdon) betina dan ikan kerapu kertang (E. lanceolatus) jantan terus dikembangkan untuk memperoleh strain baru dengan performa unggul. Penelitian ini bertujuan untuk mengevaluasi performa pertumbuhan hibrida ikan kerapu “TIKTANG” (hibridisasi antara ikan kerapu batik betina x ikan kerapu kertang jantan) terhadap perbedaan salinitas 10, 20 dan 30 ppt pada beberapa parameter pertumbuhan panjang dan bobot. Percobaan dirancang menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan perbedaan salinitas dan masing-masing diulang sebanyak tiga kali. Pemeliharaan dilakukan selama 21 hari dengan metode pemberian pakan secara at satiation. Hasil penelitian menunjukkan bahwa derajat kelangsungan hidup ikan kerapu hibrid “TIKTANG” selama pemeliharaan sebesar 100%, sedangkan performa pertumbuhan baik panjang maupun bobot menunjukan perlakuan 10 ppt lebih rendah dibandingkan 20 dan 30 ppt (p<0,05)
Performa Pertumbuhan dan Kelangsungan Hidup Kepiting Bakau (Scylla serrata) dengan Pemberian Kombinasi Pakan Keong Mas dan Ikan Rucah Lo Ode Muhammad Harisud; Endang Bidayani; Ahmad Fahrul Syarif
Journal of Tropical Marine Science Vol 2 No 2 (2019): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (435.094 KB) | DOI: 10.33019/jour.trop.mar.sci.v2i2.1378

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Mud crab (Scylla serrata) is the one of the commodities that have high economic value and potential to be cultivated. This research aimed to evaluate the growth performance of mud crab feeding with combinations of golden snail and trash fishes. The test material used was mud crab with an average weight of 111.16 grams as number of 36 individuals. The method used in this research was experimental method using a Completely Randomized Design (CRD). The treatment was golden snail as a feed, a combination of golden snail and trash fishes and trash fishes as feed. The results showed that combination feeding did not significantly affect of the growth and survival of mud crabs. The absolute weight in the treatment of golden snail feed was 24.30 ± 4.69 grams, the combination of golden snail and trash fishes was 19.34 ± 4.54 grams and the treatment of trash fishes as feed was 26.03 ± 8.11 grams. The absolute length of the treatment of golden snail feeding was 0.26 ± 0.08 cm, the combination of golden snail and trash fishes was 0.24 ± 0.05 cm and the treatment of trash fishes as feed was 0.36 ± 0.11 cm. The avrages percentage of survival for each treatment was 83.33%.
Daya Tetas Telur Cumi-Cumi (Uroteuthis chinensis) pada Salinitas yang Berbeda Jaya Samputra Pirmansa; Eva Prasetiyono; Suci Puspita Sari; Dwi Febrianti; Ahmad Fahrul Syarif
Journal of Tropical Marine Science Vol 3 No 1 (2020): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (219.408 KB) | DOI: 10.33019/jour.trop.mar.sci.v3i1.1702

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Aquatic environment influences squid hatching rates. Hatching eggs is purpose to keep the availability stock squid. The research has been done in March – April 2017. This research aims to evaluate the effect of salinity for squid eggs hatching rate. The method used in this research was experiment. The research was in Aquaculture Hatchery, Faculty of Agriculture, Fishery and Biology of TheUniversity of Bangka Belitung. The squid eggs was from the the Sea of Riau Silip (Tuing village). The squid eggs data and hatching time were analyzed descriptively. Hatching Rate, mortality, increase of squid eggs and water quality were analyzed with ANOVA. The result showed that the fastest hatching time on the salinity was 32 g/l and the lowest salinity was 24 g/l . The Results of best hatching rate on the salinity was 28 g/l and 32 g/lwith the value of each salinity were 96 % ± 6,10 and 92,67 % ± 6,89. The squid larva mortality was highest at salinity 24 g/l with the value was 77,1 % ± 16,26 and The lowest on the salinity was 28 g/l with the value was 4,1 % ± 2,88.
EFFECTIVITY OF CANBAT HERB FROM PT. MEDDIA HERBAL TO Aeromonas hydrophilla INFECTION ON NILE FISH (Oreochromis sp.) andri kurniawan; Reza Hermawan; ahmad fahrul syarif
Journal of Aquatropica Asia Vol 7 No 1 (2022): Journal of Aquatropica Asia
Publisher : Jurusan Akuakultur, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/joaa.v7i1.3299

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Tilapia (Oreochromis sp.) is a consumption fish inhabiting freshwater and likeability by society. Tilapia’s benefits can attract breeders to cultivate in mass-producing with very high market demand. Every mistake that occurs in aquaculture activities is usually the feeding management which can cause various problems, such as damage to water quality that can trigger growth—diseases, including Motile Aeromonas Septicemia (MAS) caused by Aeromonas hydrophila. The use of Canbat assumed there are contain some antioxidants that can be used as immunostimulators to increase the survival of tilapia. This research aimed to find out the concentration of Canbat product PT. Meddia herbal is effective for the treatment of tilapia (Oreochromis sp.) infected by Aeromonas hydrophila bacteria. The method used in this research was experimental. The size of tilapia used is 10-11 cm with a density of 10 fish/container. The treatment doses used were P1 (40 ppm), P2 (60 ppm), P3 (80 ppm), Positive control (Amoxicillin), and Negative control (0 ppm), with 2-hour immersion. The parameters observed were clinical symptoms, fish survival, fish response to feed, and absolute weight growth. The results indicated that herbal Canbat with concentration (80 ppm) was effective in treating tilapia infected with Aeromonas hydrophila bacteria; it produces the fastest recovery of clinical symptoms on the 12th day and the highest survival rate of 90%.
Short Communication: Utilization of Vegetables Waste as Carbon Source in Cultivation Medium for Daphnia sp. Reni Anggraini; Andri Kurniawan; Ahmad Fahrul Syarif
BERITA BIOLOGI Vol 21, No 2 (2022): Berita Biologi
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v21i2.4235

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Daphnia sp. is one of the most important natural feeds in freshwater fish farming sector. Daphnia contain considerably high protein, easy to be cultivated, short harvest time, the size is appropriate to the fish's mouth size, its movement can stimulate fish larvae to eat it, does not pollute the aquatic environment or larval rearing media and can be enriched with certain ingredients. Carbon is a source of energy for the growth of Daphnia directly or through microorganisms that become feed for Daphnia. This study aimed to analyze the effect of providing vegetable waste as a carbon source on the abundance of Daphnia and determine the best type of vegetable waste for the cultivation of Daphnia. The research method was an experimental method using 3 (three) different vegetables, namely spinach, mustard greens, and cabbage. The study was conducted using a completely randomized design with 4 (four) treatments in the form of different vegetables and control and the test sample was repeated 3 (three) times. The growth of Daphnia was observed for 16 days of cultivation time. The results showed that the provision of vegetables affected the population growth of Daphnia. Spinach (P3) was the treatment with the highest growth value, which average growth was sebanyak 96,67 individual (ind) of Daphnia with a specific growth rate of 0.055%. The temperature in Daphnia culture media generally ranged from 25-27℃, while the pH in Daphnia culture media showed a value of 7.4-9.5. The results of PCA analysis showed that water temperature was a variable that was strongly correlated with the growth of Daphnia.
IDENTIFIKASI IKAN SELANGAT BERDASARKAN KARAKTER MORFOLOGI DAN MOLEKULER DI PERAIRAN KABUPATEN BANGKA SELATAN (Selangat Fish Identification Based on Morphological and Molecular Characters at the Waters of South Bangka) Siti Aisyah; Ahmad Fahrul Syarif; Ayuningtyas Indrawati
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 18, No 2 (2022): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.18.2.67-72

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Ikan Selangat merupakan salah satu jenis ikan bernilai ekonomis dan menjadi kuliner utama dalam festival tahunan budaya dari masyarakat pesisir di wilayah Kecamatan Tukak Sadai, Kabupaten Bangka Selatan. Penelitian mengenai identifikasi karakter morfologi dan molekuler Ikan Selangat di Pulau Bangka dilakukan untuk mengkaji spesies Ikan Selangat yang ditangkap di perairan Kabupaten Bangka Selatan. Pengambilan sampel menggunakan metode random sampling di lokasi pendaratan potensial di sekitar Perairan Kabupaten Bangka Selatan pada bulan Juli 2018- Maret 2019. Sampel Ikan Selangat diidentifikasi secara morfologi dan molekuler menggunakan gen mitokondria Cytochrome C Oxydase Subunit I (COI). Hasil pengukuran morfometrik Ikan Selangat yang tertangkap di Perairan Kabupaten Bangka Selatan memiliki kisaran panjang total antara 13.0 – 15.4 cm dan panjang standar antara 10,5 – 11,8 cm, sedangkan hasil perhitungan karakter meristik sirip punggung (dorsal) memiliki jumlah jari-jari keras sebanyak 7 – 8 dan jari-jari lemah 8 – 9. Identifikasi molekuler gen COI spesies Ikan Selangat adalah Anodontostoma chacunda. Informasi ini dapat digunakan sebagai basis data potensi sumberdaya ikan di Pulau Bangka. Selangat fish is one of the species with economic value and is the main culinary in the annual festival part of cultural coastal communities in the area of Tukak Sadai District, South Bangka Regency. Study on the identification of morphological and molecular characters of Selangat fish was conducted to determine the species of Selangat fish caught in the waters of the South Bangka Regency. Sampling used a random sampling method at landing sites around the waters of South Bangka Regency in July 2018 – March 2019. Samples of Selangat fish were identified morphologically and molecularly using mitochondrial Cytochrome C Oxydase Subunit I (COI) gene. The results of morphometric measurements Selangat fish have a total length range 13.0 – 15.4 cm and standard length 10.5 – 11.8 cm, while the results of the meristic character calculation the dorsal fin which consists of 7 - 8 hard fingers and 8 – 9 weak fingers. Molecular identification the COI gene of the Selangat fish species is Anodontostoma chacunda. This information can be used as a database of potential fish resources in Bangka Island.
Karakteristik Biometrik, Morfologi Telur, dan Habitat Ikan Padi Oryzias javanicus (Beloniformes, Adrianichthyidae) Asal Desa Linduk, Pesisir Teluk Banten Muh. Herjayanto; Mas Bayu Syamsunarno; Ahmad Fahrul Syarif; Edo Ahmad Solahudin; Novita Rahmayanti; Exel Muhamad Rizki; Akhsan Fikrillah Paricahya; Kamaludin Ahmadi; Abdul Gani; Esa Rama Widiyawan; Adi Susanto; Muta Ali Khalifa
Bioscientist : Jurnal Ilmiah Biologi Vol 10, No 2 (2022): December
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v10i2.4361

Abstract

Information on the biometric characteristics, egg morphology, and habitat of O. javanicus are very important for its use as model fish in the laboratory, ornamental fish, and environmental bioindicators. Therefore, research is needed to analyze the biometric character, egg morphology, and habitat of ricefish O. javanicus in the brackish water pond of Banten Bay. This research was conducted non-eperimentally by observing biometric characters to examine meristic, morphometric, and sex dimorphism characteristics. Observations of egg morphology were macroscopic and microscopic characteristics. Habitat characteristics were observed by measuring water quality in situ. The results showed that O. javanicus from Linduk had meristic characteristics D.6–7; A.21–22; P.9-10; V.5–6 and sex dimorphism in the shape and size of the dorsal and anal fins. Blue metallic color pattern on the head and yellow color on the fins are potentially ornamental fish. O. javanicus eggs have a diameter of 1.08 ± 0.02 mm, are equipped with attaching filaments and non-attaching. The non-attaching filaments are 0.14 ± 0.03 mm in length. The percentage of yolk area was 73.7 ± 4.85%, and the oil droplet area was 8.3 ± 0.54% of O. javanicus at the gastrula stage with egg yolk volume 0.349 ± 0.048 mm3. Water quality in this study is a reference for rearing O. javanicus in the laboratory.
Co-Authors Abdul Gani Achmad Sigid Purnomo Aji Adi Susanto Adibrata, Sudirman Aditya Pamungkas Agung Priyambada Aji, Achmad Sigid Purnomo Akhsan Fikrillah Paricahya Almagribi, Siti P N I K Althaaf, Yafsar Murfid Alya Maisan Safitri Andi Gustomi Andini, Anisah Meiga ANDRI KURNIAWAN Anggraeni Anggraeni Anggraeni Anggraeni Anjani, Tiara Puspa Apriyani, Rina Ardiansyah Kurniawan Ayuningtyas Indrawati Budi Afriansyah Cintia, Vidi Damayanti, Tiara Dendi Hidayatullah, Dendi Dendy Winardi Denny Syaputra Denny Syaputra Destra Ramadhanu Dinar Tri Seolistyowati Dinar Tri Soelistyowati Dinda Rinanda Dobi Irawan Dwi Febrianti Dwi Friska Anindyta Putri Edo Ahmad Solahudin Endang Bidayani Esa Rama Widiyawan Eva Lestari Eva Prasetiyono Eva Prasetiyono Eva Prasetiyono Eva Utami Exel Muhamad Rizki Fika Dewi Pratiwi Fitri Sil Valen Friyuanita, Friyuanita Gulo, Cania Putri Nimalasari Hafidz, Agus M Hafidz, Agus Miftahudin Hafizhotur Rohmaniah Harton Arfah Hedi Sanjaya Herjayanto, Muh. Hidawati, Risna Ichsan, Muhamad Indra Ambalika Syari Irma Akhrianti Jaya Samputra Pirmansa Jeanne Darc. N. Manik Kamaludin Ahmadi Kanaah, Akhlakul Khanati, Olivia KHOIRUL MUSLIH Kurniawati, Febi Kusumah, Wanda La Ode Wahidin Lestari, Bebbi Lindiantika, Lindiantika Lindiatika, Lindiatika Lista, Dona Lo Ode Muhammad Harisud M.A. Hari Fitriyanto ma'ruf, muhammad masrur Madyastuti, Eka Putri Maftuch Maftuch Mas Bayu Syamsunarno Muhamad Amin Muhammad Arif Nasution Muhammad Arif Nasution muhammad masrur ma'ruf Muhammad Zambawi Mustobi Prananda Muta Ali Khalifa Mu’alimah Hudatwi Mu’alimah Hudatwi Nopitasari, Indah Novi Santia Novita Rahmayanti Nur Rahmadina Nurcahyono, Eka Okto Supratman Patmawati Patmawati Permatasari, Sheny Prananda, Mustobi Prayoga, Ajie Putri, Zakia A Rahmansyah, Nurditya Ramadhanu, Destra Reni Anggraini Reza Hermawan RIDWAN AFFANDI Rina Apriyanti Risna Hidawati Robin Robin Robin Robin Robin Robin Robin, Robin S, Merin Safitri, Alya M Samsuddin, M. Afdal Samuki, Khairul Sanjaya, Hedi Sapto Andriyono Silaen, Johannes OH Siti Aisyah Siti Aisyah Siti Puan NIK Almaghribi Suci Puspita Sari Suci Puspita Sari Suci Puspita Sari Teguh Firnanda Thania Thania Ulfa Dwinda Icas Umroh Umroh Verry Andre Fabiani Vidi Cintia Wijaya, Imam Wijayanti, Amalia Winardi, Dendy Wulandari, Ufi Ayu Yuant Tiandho Yusnandar, Firman Zambawi, Muhammad Zulfadhli Zulfadhli Zulfadhli Zulfadhli