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All Journal JURNAL HUKUM Maspari Journal Jurnal Natur Indonesia Jurnal Perikanan dan Kelautan Berkala Perikanan Terubuk Jurnal Ilmu Lingkungan Jurnal Kajian Lingkungan Bulletin of Electrical Engineering and Informatics Jurnal Ilmu Perairan (Aquatic Science) Maspari Journal Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan JURNAL BIOLOGI INDONESIA Science and Technology Indonesia IJEBA (International Journal of Economic, Business & Applications) JURNAL PHOTON Jurnal Ilmu Kedokteran dan Kesehatan Asian Journal of Aquatic Sciences ECOTONE SIMBIOSA Jurnal Zona Journal of Coastal and Ocean Sciences Devotion: Journal of Research and Community Service Journal of Rural and Urban Community Empowerment SEHATI: Jurnal Kesehatan Dinamika Lingkungan Indonesia CANANG: Jurnal Pengabdian Masyarakat Jurnal Ilmiah Multidisiplin (JUKIM) Jurnal Ilmu-Ilmu Kehutanan EcoNews Jurnal Manusia dan Lingkungan South East Asian Marine Sciences Journal Arborescent Journal Jurnal Perikanan dan Kelautan Jurnal Senpling Multidisiplin Indonesia Tropical Marine Environmental Sciences Jurnal Natur Indonesia
Yusni Ikhwan Siregar
Universitas Riau
Religion Agriculture, Biological Sciences & Forestry Arts 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 Electrical & Electronics Engineering Energy Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Nursing Physics Public Health Social Sciences Veterinary Other

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MIKROBIOLOGICAL TESTING OF CAROTENOID PIGMENT  EXTRACT AGAINST THE PATHOGENIC BACTERIUM Vibrio harveyi  IN SHRIMP PONDS Karenina Azzahra; Yusni Ikhwan Siregar; Ummi Mardhiah Batubara
Asian Journal of Aquatic Sciences Vol. 9 No. 2 (2026): August
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.9.2.118-125

Abstract

Shrimp is one of the key fishery commodities for the national economy. The main problem in shrimp farming is infection by the bacterium Vibrio harveyi, which is commonly controlled using conventional antibiotics. Uncontrolled antibiotic use can lead to bacterial resistance; therefore, it is necessary to identify alternative antibacterial compounds that are more environmentally friendly, such as carotenoid pigment extracts from marine microorganisms. This study aims to analyze the antibacterial activity and determine the Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of carotenoid pigment extracts against V. harveyi. Carotenoid pigment analysis was performed using UV-Vis spectrophotometry, while antibacterial activity was tested using the disk diffusion method (Kirby-Bauer). MIC and MBC were determined using the liquid dilution and pour plate methods. The extract concentrations used were 12,5%, 25%, 50%, and 100%. The results showed that the extract exhibited a maximum absorbance at 490 nm, with a total carotenoid content of 14.56 µg/mL. In addition, the carotenoid pigment extract from isolate LD02 inhibited the growth of V. harveyi, with inhibition zones ranging from 1.41 to 3.58 mm. The MIC was 14.56 µg/mL, while the MBC was>14.56 µg/mL, indicating that the extract exhibits bacteriostatic activity against V. harveyi.
Analysis of Surface Currents during Flood and Ebb Tides Using the LSPIV Method in the Rokan River Estuary Astio Ruelalda; Mubarak Mubarak; Yusni Ikhwan Siregar
South East Asian Marine Sciences Journal Vol. 4 No. 1 (2026): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.4.1.10-16

Abstract

The Rokan River Estuary is a transitional zone with complex hydrodynamics shaped by the interaction of river discharge, tidal forces, and bed morphology, making reliable surface current data essential for coastal management and navigation safety. This study aimed to analyze the characteristics and velocity of surface currents during flood and ebb tide conditions in the Rokan River Estuary using the Large-Scale Particle Image Velocimetry (LSPIV) method based on UAV drone video imagery, and to evaluate its agreement with current meter measurements. The research was conducted in February 2025 through a quantitative descriptive-spatial field survey; video data were processed using pyOpenRiverCam and validated via linear regression, correlation coefficient (R), coefficient of determination (R²), RMSE, and MAE. Results showed surface current velocities ranging from 0–2 m/s, flowing relatively uniformly toward the southwest–west during ebb tide following the river flow, while during flood tide the current became more variable toward the southeast–east due to seawater intrusion. Validation revealed a positive but weak relationship between LSPIV and current meter data, with better accuracy during the flood phase (R=0.362; R²=0.131; RMSE=0.309) than the ebb phase (R=0.242; R²=0.058; RMSE=0.407). The UAV-based LSPIV method proved to be a promising, efficient, and non-contact alternative for surface current measurement, supporting sustainable estuarine hydrodynamic studies.
Uji Antagonis Isolat Tunggal, Konsorsium dan Ekstrak Spray Bakteri Probiotik, Penghasil Pigmen Serta Pengurai Plastik Terhadap Bakteri Patogen Pada Kulit Najwaa Aqilah Masri; Feli Feliatra; Yusni Ikhwan Siregar
Arborescent Journal Vol 3 No 3 (2026): Juni - September
Publisher : Universitas Madako Tolitoli

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56630/arj.v3i3.1853

Abstract

Resistensi antibiotik pada bakteri patogen kulit mendorong pencarian sumber antibakteri alami sebagai alternatif antibiotik konvensional. Penelitian ini bertujuan menganalisis dan membandingkan aktivitas antibakteri isolat tunggal, konsorsium, dan ekstrak spray bakteri laut yang terdiri atas bakteri probiotik, penghasil pigmen, dan pengurai plastik terhadap Staphylococcus aureus, Cutibacterium acnes, dan Pseudomonas aeruginosa. Penelitian dilaksanakan di Laboratorium Mikrobiologi Laut, Fakultas Perikanan dan Ilmu Kelautan, Universitas Riau pada November 2025–Januari 2026. Aktivitas antibakteri diuji menggunakan metode difusi cakram dengan diameter zona hambat sebagai parameter pengamatan. Pengujian isolat tunggal menggunakan sembilan isolat bakteri laut, sedangkan konsorsium diuji pada waktu inkubasi hari ke-1, 3, 5, 7, dan 9. Ekstrak spray diuji pada konsentrasi 1,5%, 3%, dan 6%. Hasil penelitian menunjukkan bahwa zona hambat terbesar secara umum diperoleh terhadap C. acnes. Isolat Bacillus cereus SN7 menghasilkan zona hambat terbesar pada pengujian isolat tunggal terhadap C. acnes, yaitu 8,02 mm. Konsorsium menghasilkan zona hambat yang relatif rendah terhadap ketiga bakteri patogen, dengan sebagian besar nilai berada pada kategori lemah (≤5 mm). Pada ekstrak spray, kode 3 dengan konsentrasi 6% menghasilkan zona hambat terbesar terhadap C. acnes, yaitu 10,38 mm. Pola penghambatan ekstrak spray berbeda antar bakteri uji dan tidak menunjukkan hubungan yang konsisten dengan peningkatan konsentrasi. Berdasarkan hasil deskriptif, isolat tunggal dan ekstrak spray menunjukkan diameter zona hambat yang lebih besar pada beberapa perlakuan dibandingkan konsorsium. Hasil penelitian menunjukkan adanya aktivitas antagonis bakteri laut terhadap bakteri patogen kulit dalam kondisi pengujian in vitro.
Co-Authors ', Arfitrah . Zulfan A.A. Ketut Agung Cahyawan W AA Sudharmawan, AA Adel Zamri Adelina, Adelina Adiana Sulistianto Afriza, Dinny Afrizal Tanjung Agnesia Jaiyani br Barus Agnesia, Yohana Agung Dhamar Syakti Agus Mandar Agus Susanto Ahmad Faisal Daulay Ahmad Kurnain ahmad rizal Alfi Puadi Alimah Alimah Alimah, Alimah Almasdi Syahza Alvin Natali Amalia Prafitra Harman Amanda, Yossie Anak Agung Istri Sri Wiadnyani Ananta, Dio Alif Andi Yusapri Andrew ST OS Andri, Rinda Juni Andrianto, Galih Anhar Anhar Anisaldi Anisaldi Anita, Sofia Anton Akbar Nugraha Antoni Antoni Antonius ' Apdillah, Doni Aras Mulyadi Arief Mubyarso Arief Rachman. B Aristya Ardhitama Aritonang, Simon Hasintongan Astio Ruelalda Autika, Yotta Azhari, Febbi Bahtiar Denny Edison Barnes Silitonga Batubara, Ummi Mardhiah Bayhakki Bayhakki Bayu Oktavian Benny Heltonika Bintal Amin Budi Darmawan Cik Mas Edison Claudya, Sonia Glory Dahlia Dahlia Dameria Dameria Dandi Arianto Pelly Dani Ali, Nurhalim Dariono Dariono Dariono, Dariono Dariyatmo Dariyatmo Debby Febriani Dedi Afandi Defri Yoza Deni Efizon Denny Mulianto Dermawan, Ernanda Putra Desi Ariani DESI PURNAMA SARI Desis Tri Yenti Dessy Yoswaty Devid Joehari Dharma Eka Putra Dianysah, Gusti Dilla Andini Doni Apdillah Dr. Nofrizal, S.Pi, M.Si Dyonisius Hutauruk Edy T S Sihombing Efendi, Musanif Effino Panji Sudewo Efriyeldi, Efriyeldi Eko Hendi Saputra Eko Sutrisno Eko Sutrisno, Eko Elda Nazriati Elfizar, Elfizar Elizal Elizal Elizal Endang Agus Damanhuri Erfana Romauli Lumbantoruan Ernawaty Ernawaty Fabri Putra Nugraha Fadel Fadel Fadli Aulia Fajar Fajar Fajriani Ananda Fakhrurrozi Fakhrurrozi FAUZIYAH Febriana Zulmi Febrina Hanum Feli Feliatra Feliatra Fepi Yulianti Fika Yulia Rachmah Fitri Agustriani Fitri, Yuliza Fransiska, Dina Fuad, M Anwar Fuadi, Indra Ginting, Daniel Paskah Hadi Sastranegara Hadinoto Hadinoto Hafidawati, Hafidawati Hairussalam, Hairussalam Hari Handika Sektiawan Harianto Harianto Hasdi Yanti HS Helmi Putra Hendra Taufik Heni Pujiastuti Henni Elyati Henni Syawal Herli, Irwan Herli, Irwan Hidayat Pratamasari Hutomo, Ragil Tribhakti I Gusti Ngurah Antaryama Iesje Lukistyowati Ilham Ilahi Imam Pangestiansyah Putra Imran , Imran Imran Imran Indra Wariski Indra Wariski Irfan Yunus Irvina Nurachmi irvina Nurachmi Irwandy Syofyan Isjoni Isjoni Islami, Muhammad Dinul Isnaini Jhon Edward Jhon Prengky Jimmy Copriady Johanes Hutagaol Joneri, Romi Jonny Zain Juandi Juandi Karenina Azzahra Karnila, Rahman Karnila Kevin Anandika Dwi Putra Khawarizmi, Dannes M. Laura Dameshita Silalahi Lee, Seung Hun Lilis Kurnia Lilis Kurnia Lita Febriani Lubis, Abdillah Lysbetti Marpaung, Noveri M. Delpopi M. Imran Sinaga Maliki Maliki Manalu, Govinda Hendra Marpauang, EkoRinaldi Maulana Hardi Melki Meuthia Pangerani Miduk Tampubolon Mirna Ilza Miswadi Miswadi Mubarak Mubarak Mubarak Mubarak Mubarak Mubarak Mubarak Mubarak Muhammad Arif Fahrurozi Muhammad Fahrul Mulyadi Mulyadi Musrifin Galib Nabila, Amelia Nadila Nur Khotimah Nafril Yuzen Najwaa Aqilah Masri Nawari Nawari Nawari Neni Ristiani Nofrizal Nofrizal Nofrizal Nofrizal Noprianda, Renza Novi Permata Sari Nugrahani Trie Ryzzky Nurafni, Melia Nurrahmi, Febi Nursyirwani, Nursyirwani Nurul Abdiah Nasution Nur’aini, Intan Oktama R, Dhea Oktavia Dewi Oktavia Dewi, Oktavia Olfa Riyana Prameswari, Cinta Riyanda Prastya Bayu Afrian Purnama, Indra Dwi Putra Putra, Kevin Anandika Dwi Putri Kalbina Rahmadi Rahmadi Ramses Ramses Firdaus, Ramses Ramses Ramses Rasoel Hamidy Razai, Tengku Said Redho Yoga Nugroho Ridwan Manda Putra Rifardi Rika Kurniawan Rika Kurniawan Rika Kurniawan Rinaldo, Rinaldo Rinaldo, Rinaldo Riris Aryawati Risna Nofriani Ritonga, Agnesia Rivaldi Ananda Dwi Putra Roito, Martin Romi Joneri Rommie Jhonerie Ronal Yuriza Fithra Rosma, Iswadi Hasyim Rosyidin, Hidayatul Rozirwan . Salsabilla, Dila Azzahra Sania Glory Claudya Sanya Gautami Saputra, Muhammad Nasrul Septian Julifar Silaban, Tulus Gandra Saputra Simanjuntak, Ezra Yehezkiel Rumegius Siti Zahrah Siti Zahrah Situmorang, Nesi Silvia Sofia Anita Sofyan Husein Siregar Sri Indarti Sukendi Sukendi Sumanti, Susi Suwondo Suwondo Suyanto Suyanto Syafriansyah, Syafriansyah Syafruddin Nasution Syahril Nedi Syahril Syahril Syahril Syahril SYAIFUL BAHRI Syaiful Ramadhan Harahap Syarwandi David T. Edy Sabli Tengku Nurhidayah Thamrin Thamrin ' Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Tyas Handayani Uju Doi Sibarani Verid Aria Susammesin, Verid Aria Viktor Amrifo Viktor Amrivo Vivi Indriani Vivin Seygita Vivin Seygita, Vivin Wariski, Indra Wike Ayu Eka Putri Yana, Tesya Desi Yani, Indah Novi Yanti Dasrita Yanti Dasrita, Yanti Yetti Elfina S Yossie Amanda Yuhanda, Sabina Dwi Yulindra, Ade Yuwanda Ilham Zahtamal Zahtamal Zulfahmi, Sayid Zulfan Saam Zulfan Saam Zulfan Saam Zulfan Saam Zulfan Saam Zulfikar, Andi Zulhendri Zulhendri Zulkarnain Umar Zulkarnain Zulkarnain Zulkarnaini Zulkarnaini Zulkifli Zulkifli