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Ronal Kurniawan
Department Of Aquaculture, Faculty Of Fisheries And Marine, Universitas Riau; Center For Peatland And Disaster Studies, LPPM Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Physics Social Sciences Veterinary Other

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Gejala Klinis Ikan Komet (Carassius auratus) yang Terinfeksi Bakteri Aeromonas hydrophila dan Pascapengobatan dengan Larutan Propolis M. Riswan; Lukistyowati, Iesje; Syawal, Henni; Riauwaty, Morina; Alfinda, Rudi; Kurniawan, Ronal; Putri, Mega Novia
South East Asian Aquaculture Vol. 3 No. 1 (2025): Juli
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seaqu.3.1.1-8

Abstract

Penelitian ini bertujuan untuk mengetahui gejala klinis ikan komet yang terinfeksi bakteri Aeromonas hydrophila dan pascapengobatan dengan larutan propolis. Metode yang digunakan adalah metode eksperimen dengan menerapkan rancangan acak lengkap (RAL) dengan satu faktor lima taraf perlakuan dan tiga kali ulangan perlakuan. Perlakuan tersebut adalah adalah Kn (tidak terinfeksi A.hydrophila dan tidak diobati propolis), Kp (terinfeksi A. hydrophila  tetapi tidak diobati propolis), sedangkan ikan terinfeksi A.hydrophila diobati dengan propolis dosis P1 (700 ppm), P2 (800 ppm), dan P3 (900 ppm). Pengobatan dilakukan dengan cara penyuntikan propolis pada ikan yang terinfeksi A.hydrophila di bagian intramuscular sebanyak 0,1 ml. Bahan uji yang digunakan adalah ikan komet (Carassius auratus) ukuran 8-10 cm sebanyak 150 ekor. Hasil penelitian menunjukkan bahwa ikan yang terinfeksi bakteri A.hydrophila menunjukkan gejala klinis sirip ekor gripis, bercak merah, mata menonjol (exopthalmia), perut mengembung (dropsy), sisik tubuh lepas. Setelah 14 hari pascapengobatan dengan larutan propolis perlakuan terbaik adalah perlakuan P2 dosis (800 ppm) mengalami kondisi pemulihan mendekati gejala klinis kondisi ikan normal terlihat dari warna tubuh cerah, produksi lendir normal, sirip ekor utuh, tidak terdapat mata menonjol (exopthalmia), dan perut tidak mengembung (dropsy).
Teknik Isolasi dan Identifikasi Bakteri pada Ikan Mas koki (Carassius auratus) di Stasiun Karantina Ikan Pengendalian Mutu dan Keamanan Hasil Perikanan (SKIPM) Padang, Sumatera Barat Rizvi, Fharisa Nabila; Putri, Mega Novia; Kurniawan, Ronal; Hendriyantoni, Agus
South East Asian Aquaculture Vol. 3 No. 1 (2025): Juli
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seaqu.3.1.9-15

Abstract

Ikan mas koki (Carassius auratus) merupakan ikan hias air tawar populer yang menghadapi tantangan serius berupa serangan penyakit bakteri dalam sistem budidaya. Kegiatan ini bertujuan untuk mengisolasi dan mengidentifikasi bakteri patogen pada ikan mas koki melalui praktik magang di Laboratorium Bakteri Stasiun Karantina Ikan dan Pengendalian Mutu Hasil Perikanan (SKIPM) Padang, Sumatera Barat, yang dilaksanakan pada 8 Januari hingga 7 Februari 2024. Metode yang digunakan teknik isolasi bakteri dari organ ginjal ikan sampel yang berasal dari pengguna jasa lalu lintas ekspor-impor. Identifikasi bakteri dilakukan melalui pengamatan karakteristik morfologi koloni dan serangkaian uji biokimia meliputi pewarnaan Gram, uji oksidase, katalase, dan motilitas. Berdasarkan hasil uji biokimia tersebut, bakteri yang menginfeksi ikan mas koki diidentifikasi sebagai Staphylococcus sp. Temuan ini mengonfirmasi bahwa Staphylococcus sp. merupakan patogen signifikan yang dapat menyebabkan gangguan kesehatan pada ikan mas koki, terutama melalui infeksi sistemik pada organ ginjal. Kegiatan ini memberikan kontribusi penting bagi pengembangan strategi pengendalian penyakit dalam budidaya ikan mas koki dan mendukung upaya peningkatan kesehatan ikan dalam sistem karantina.
Literatur Review: Pengembangan Kapasitas Perempuan Pesisir dalam Diversifikasi Ekonomi Lokal Kurniawan, Ronal; Wahyuni, Sri
South East Asian Management Concern Vol. 2 No. 2 (2025): May
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamac.2.2.64-70

Abstract

Wilayah pesisir memiliki potensi sumber daya alam yang besar namun sering menghadapi tantangan sosial dan ekonomi yang kompleks, termasuk kemiskinan dan keterbatasan akses layanan dasar. Dalam konteks ini, perempuan pesisir memainkan peran penting dalam mendukung ekonomi rumah tangga dan pengelolaan sumber daya lokal. Artikel ini merupakan kajian literatur yang bertujuan untuk menganalisis pengembangan kapasitas perempuan pesisir dalam mendukung diversifikasi ekonomi lokal. Studi ini mengkaji literatur yang terbit antara tahun 2020 hingga 2025, mencakup pendekatan teoritis, metodologis, serta implikasi kebijakan. Hasil kajian menunjukkan bahwa pendekatan berbasis komunitas, pelatihan kewirausahaan, literasi keuangan, dan integrasi gender dalam kebijakan publik berkontribusi signifikan dalam meningkatkan kapasitas perempuan pesisir. Namun demikian, tantangan struktural seperti akses terbatas terhadap sumber daya, pendidikan rendah, dan norma gender tradisional masih menjadi hambatan utama. Kajian ini juga menemukan kesenjangan geografis dan tematik dalam penelitian yang ada, serta minimnya studi jangka panjang yang mengevaluasi dampak program secara berkelanjutan. Oleh karena itu, diperlukan pendekatan lintas disiplin dan kolaboratif dalam merancang strategi pemberdayaan perempuan pesisir yang inklusif dan kontekstual, guna mewujudkan pembangunan ekonomi lokal yang adil dan berkelanjutan
RESPONSE IMMUNITY OF GOLDFISH (Carassius auratus) INFECTED WITH Aeromonas hydrophila BACTERIA AND POST-TREATMENT WITH PROPOLIS SOLUTION Riswan, M; Lukistyowati, Iesje; Syawal, Henni; Kurniawan, Ronal; Putri, Rianti; Putri, Mega Novia
Asian Journal of Aquatic Sciences Vol. 8 No. 2 (2025): August
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.8.2.223-229

Abstract

This study aims to determine the immunity response of  Carassius auratus infected with Aeromonas hydrophila bacteria and post-treatment with propolis solution by measuring total leukocytes and phagocytosis index. The method used is experimental by applying a completely randomized design (CRD) with five treatments and three replications. The treatments were Kn (not infected with A. hydrophila and not treated with propolis), Kp (infected with A. hydrophila but not treated with propolis), while fish infected with A. hydrophila were treated with propolis doses P1 (700 ppm), P2 (800 ppm), and P3 (900 ppm). Treatment was done by injecting 0.1 ml of propolis into fish infected with A. hydrophila intramuscularly. The test material was 150 fish of 8-10 cm in size. The results showed that propolis significantly gave an immune response to the C. auratus infected with A. hydrophila (p<0.05). The 800 ppm propolis dose was the most effective, as indicated by a total leukocyte count of 3.70×104 cells/mm3, a phagocytosis index value of 28.33%, and a survival rate of 83.33%. This study highlights that propolis has potential as a natural immunostimulatory agent in enhancing non-specific defense mechanisms in C. auratus infected with pathogenic bacteria
Strategi Pengelolaan Berkelanjutan Laut dan Pulau-Pulau Kecil: Tinjauan terhadap Pendekatan Ekologis, Sosial, dan Kebijakan Wahyuni, Sri; Mursawal, Asri; Kurniawan, Ronal
South East Asian Management Concern Vol. 2 No. 2 (2025): May
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamac.2.2.71-78

Abstract

Laut dan pulau-pulau kecil memiliki nilai ekologis, sosial, dan ekonomi yang sangat penting, terutama bagi masyarakat pesisir di negara kepulauan seperti Indonesia. Namun, kawasan ini menghadapi berbagai tantangan serius seperti degradasi ekosistem, eksploitasi berlebihan, konflik ruang, dan dampak perubahan iklim. Artikel ini merupakan kajian literatur yang bertujuan untuk mengidentifikasi dan menganalisis pendekatan pengelolaan yang efektif dalam mewujudkan keberlanjutan wilayah laut dan pulau kecil. Beberapa pendekatan yang dikaji meliputi pengelolaan berbasis masyarakat (CBM), perencanaan ruang laut atau marine spatial planning (MSP), serta kawasan konservasi laut berbasis teknologi. Selain itu, tinjauan terhadap kebijakan nasional dan peran kelembagaan menunjukkan pentingnya koordinasi lintas sektor, partisipasi lokal, serta peningkatan kapasitas sumber daya manusia. Konsep ekonomi biru juga dibahas sebagai strategi alternatif untuk menyeimbangkan pertumbuhan ekonomi dengan kelestarian lingkungan melalui ekowisata bahari, budidaya laut berkelanjutan, dan inovasi produk kelautan lokal. Kajian ini merekomendasikan sinergi antara pendekatan ekologis, sosial, dan kelembagaan sebagai dasar bagi tata kelola laut dan pulau kecil yang berkelanjutan dan inklusif
HYBRIDISATION OF FEMALE KOI (Cyprinus rubrofuscus) AND MALE KAPIAT (Barbonymus schwanenfeldii) WITH ARTIFICIAL SPAWNING IN KAMPAR DISTRICT, RIAU Nasita, Abian Surya; Rostika, Rita; Priowirjanto, Gatot Hari; Zidni, Irfan; Davinci, Leonardo; Kurniawan, Ronal; Karsih, Okta Rizal
Asian Journal of Aquatic Sciences Vol. 8 No. 2 (2025): August
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.8.2.300-309

Abstract

This study aims to evaluate the potential for hybridisation between female koi (Cyprinus rubrofuscus) and male kapiat (Barbonymus schwanenfeldii) through artificial spawning. The study was conducted at Kampar Ornamental Fish, Kampar District, Riau Province. The method used was a Completely Randomized Design (CRD) with two treatments: P1 (koi × koi) as the control, and P2 (koi × kapiat) as the hybrid treatment, each with three replicates. The parameters observed included fecundity, fertilisation rate (FR), hatching rate (HR), absolute length growth, and survival rate (SR). The results showed that hybridisation produced promising performance in terms of FR (21.99%), HR (55.02%), and SR (41.6%). In conclusion, hybridisation between koi and kapiat fish has the potential to produce superior varieties, although attention must be paid to environmental factors such as temperature and pH
Bioactive Potential of Marine Biota (Algae, Sponges, and Marine Bacteria) as a Source of Antimicrobial Compounds Wahyuni, Sri; Mursawal, Asri; Kurniawan, Ronal
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.19-26

Abstract

Antimicrobial resistance has become one of the most serious global health threats, prompting the search for new natural sources of antibiotics. Marine biota, such as algae, sponges, and bacteria, are known to produce a variety of secondary metabolites with potential biological activity, particularly as antimicrobial compounds. This review article examines the bioactive potential of these marine biota as an alternative source of natural antibacterial compounds. The study was conducted by reviewing various international and national literature related to the bioactive metabolites produced, their mechanisms of action against pathogenic bacteria, and the potential for their use in developing new antibacterial agents. The results of the review indicate that sulfated polysaccharides, terpenoids, alkaloids, and phenolic compounds from algae; alkaloids, cyclic peptides, and terpenoids from sponges; and secondary metabolites of marine symbiont bacteria have significant antibacterial activity, including against antibiotic-resistant bacteria. However, the development of marine bioactive compounds still faces various obstacles, particularly related to isolation techniques, mass production, and environmental sustainability issues. Therefore, modern biotechnological approaches, such as genomics, metabolomics, and synthetic biology, are needed to optimize the utilization of these marine resources. This article confirms that marine biota are important candidates for the development of new, sustainable antibacterial agents and have the potential to support the strengthening of the blue economy concept.
Species Inventory of Epilithic Macroalgae in Padang Unoi Coastal Waters, Simeulue Island Wahyuni, Sri; Mursawal, Asri; Usiani, Lulu; Kurniawan, Ronal
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.108-115

Abstract

Epiphytic macroalgae are phototrophic organisms that attach to rigid substrates in the intertidal zone and serve as key components of coastal ecosystem structure due to their roles in providing habitat, stabilizing substrates, and supporting nutrient cycling. This study aimed to inventory the types of epiphytic macroalgae present in the rocky intertidal zone of Padang Unoi Village, Salang District, Simeulue Regency. Observations were conducted in July 2025 along a 150-m transect, dividing the area into two tidal zones: the lower littoral and the mid-littoral. The inventory revealed seven species of epiphytic macroalgae, namely Turbinaria sp, Sargassum sp, Padina sp, Chaetomorpha aerea, Caulerpa taxifolia, C. racemosa, and Amphiroa subcylindrica. Species from the Phaeophyta division dominated the mid-littoral zone, while Chlorophyta were more abundant in the lower littoral zone, and Rhodophyta were observed on coarse-textured rocky substrates. These three major divisions indicate habitat heterogeneity that supports the growth of various types of epiphytic macroalgae. The results of this study highlight the importance of the rocky intertidal zone of Simeulue as a productive habitat and provide a basis for sustainable coastal resource management
Immunostimulant effect of Chaetomorpha sp in Tilapia infected with Aeromonas hydrophila Kurniawan, Ronal; Putri, Mega N.; Riswan, M.; Wahyuni, Sri; Mursawal, Asri
Aceh Journal of Animal Science Vol 10, No 2 (2025): June 2025
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/ajas.10.2.45364

Abstract

Chaetomorpha sp is a type of green marcoalgae that is rich in bioactive compound that function as antibacterial, anti-inflammatory and can increase fish immunity. This study aims to determine the immunostimulating effect of Chaetomorpha sp macroalgae extract on the leukocyte profile of Tilapia infected with A. hydrophila. The experimental method used a completely randomized design (CRD) with four extract dose treatments (0, 25, 50, 75 mL/kg feed) and three replicates. The test fish used were 2.63 0.26g, reared in black tanks with a size of 60x30x30 cm, a volume of 80 L with a stocking density of 1 fish/4 L, and a recirculation system. Maintenance was carried out for 60 days with a frequency of feeding three times a day, namely 08.00 AM, 01.00 PM, and 05.00 PM, as much as 5% of body weight. The parameters observed were total leukocytes, leukocyte differentiation, and phagocytosis index. The results showed that the administration of Chaetomorpha sp extract significantly increased total leukocytes, lymphocyte differentiation, and phagocytosis index (p0.05). The dose of 50 mL/kg feed is the optimal dose that affects the leukocyte profile of Tilapia. T0 (without extract) experienced 100% mortality, while the treatment group showed increased resistance to infection. Bioactive compounds such as sulfated polysaccharides and flavonoids in Chaetomorpha sp are thought to play a role in stimulating the innate immune system. This study highlights the potential of Chaetomorpha sp as an alternative to antibiotics in sustainable tilapia aquaculture.
Structure of Intestinal and Kidney Tissue of Carp (Cyprinus carpio) Maintained in Salinity Media and Feed Enriched with Guava Leaf Flour (Psidium guava) Pulungan, Amar Doli; Windarti, Windarti; Eddiwan, Eddiwan; Effendi, Irwan; Kurniawan, Ronal
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.136-143

Abstract

Carp (Cyprinus carpio) is one of the freshwater fishery commodities with high economic value. Keeping carp in saline media can affect the osmoregulation system, impacting the performance of vital organs such as the intestines and kidneys. Such disturbances can potentially reduce fish's health and survival rate. One strategy that can be used to increase the fish's immune system is through feed supplementation with natural immunostimulants, one of which is guava leaf flour (Psidium guajava), which is known to contain bioactive compounds such as flavonoids, tannins, and saponins. This study aims to evaluate the effectiveness of guava leaf flour-enriched feed on the histological structure of the intestines and kidneys of carp raised in saline media and exposed to Aeromonas hydrophila bacterial infection. The study was conducted from August to October 2024 at the Biotechnology Laboratory, Faculty of Fisheries and Marine, Universitas Riau. The method used was an experiment with a completely randomized design (CRD) consisting of five guava leaf flour dosage treatments with three replicates. The results showed that the histological structure of the intestine in all treatments was relatively normal, with neatly arranged villi and round to oval goblet cells. However, in the guava leaf powder supplementation treatment, several abnormalities were found in the kidney tissue, including inflammation, hemorrhage, and necrosis. This indicates that the salinity factor has a greater effect on kidney damage than the effect of immunostimulant administration. Nevertheless, the administration of guava leaf powder still positively improved the immune response and survival rate of fish. The optimal dose was obtained in treatment P2 (15 g/kg feed) with a survival rate of 83.33–93.33%. The water quality parameters during the study were still within the acceptable range for aquaculture, namely temperature 28–31°C, DO 3.7–7.4 mg/L, and pH 5.5–7. Thus, it can be concluded that feeding fish with guava leaf flour-enriched feed is effective in maintaining intestinal histology and increasing the survival rate of carp in saline media, although it cannot completely prevent kidney damage caused by environmental factors
Co-Authors Ahmed Al-Harbi Al Zikri, Muhammad Abdillah Alfiati Silfi Alfinda, Rudi Ali Sarong Angraika Dirta Apriliani, Elisa Armando, Fitrian Asiddiqqi, Hasby Asmika Harnalin Simarmata Asri Mursawal Asri Mursawal Atthoriq, Fawwaz AZUZ, FAIDAH Davinci, Leonardo Deni Efizon Dessy Yoswaty Diana, Fitri Dimas Gusriansyah Eddiwan Kamaruddin Efawani, Efawani Efriyani, Intan Efriyeldi, Efriyeldi Eka Lisdayanti Fakhrurozi, Fakhrurozi Fikri, Algi Fari Firmansyah, Rodhi Fitri Kurniati, Fitri Fitrian Armando Fitrian Armando Gusriansyah, Dimas Hayatun Nufus Hayatun Nufus Hayatun Nufus Hendri Kurniawan, Hendri Hendriyantoni, Agus Henni Syawal Henny Syawal Henny Syawal Hermawan, Reza Husnul Yaqin Harahap Husnul Yaqin Harahap, Husnul Yaqin Iesje Lukistyowati Ika Kusumawati Irwan Effendi Irwan Irwan Irwan Limbong Karnila, Rahman Karnila Karsih, Okta Rizal M Irsyad Nur M Irsyad Nur, M Irsyad M Rizal M. Ali Darmawan Mahdiyah, Evfi Mai Suriani Marbun, Serliana Hotmariska Mardhatila, Anisa Masjudi, Heri Mega Novia Putri Mega Novia Putri Meliana, Annisa Mohamad Gazali Mohamad Gazali Muhammad Natsir Kholis Muhammad Rizal Razman Munandar Munandar Mursawal, Asri Nabila Afifah Azuga Nabila, Nuryuni Nafisah Eka Puteri Nasita, Abian Surya Nisfi Maulidia Nasution Nur Ikhlas Syuhada Nur Ikhlas Syuhada Nur Ikhlas Syuhada, Nur Ikhlas NURLAELA NURLAELA Nursyirwani, Nursyirwani Nurul Hidayat Okta Rizal Karsih Okta Rizal Karsih Oktavia Oktavia Priowirjanto, Gatot Hari Pulungan, Amar Doli Putri, Mega N. Putri, Mega Novia Putri, Nadila Yusmi Putri, Rianti Rahmiza, Nurul Ramadhan, Azhari Ramanda, Reski Riki Saputra, Riki Riswan, M Rita Rostika Rizka Aprisanti Rizki Lestari Rizvi, Fharisa Nabila Rizvi, Fharisa Putri Rulyanti, Mairisa Rusliadi Rusliadi Sahputri, Herliza Khairani Samudra, Arung Saputri, Jumaida Sari, Mira Rahmita Saryono Saryono Shofian Nanda Adiprayoga Shorea Khaswarina Siregar, Ade Nanda Febrian Sri Endang Kornita Sri Wahyuni Sri Wahyuni Sri Wahyuni Sri Wahyuni Sri Wahyuni Sri Wahyuni Sri Wahyuni Syahputra, Tomi Syahril Nedi Syahroni, Desty Syam, Anandasya Suci Nabila Tirta Anugerah Tomi Syahputra Ulfi Laili Astika Ulfi Laili Astika Usiani, Lulu Usman Muhammad Tang Windarti Windarti Windarti Windarti Yuharmen - Yulindra, Ade Zidni, Irfan