Article Per Year (5 Year)
p-Index From 2021 - 2026
1.295
P-Index
This Author published in this journals
All Journal Jurnal Natur Indonesia Asian Journal of Aquatic Sciences South East Asian Marine Sciences Journal South East Asian Management Concern Journal Tropical Marine Environmental Sciences
Okta Rizal Karsih
Department of Aquaculture, Faculty of Fisheries and Marine, Universitas Riau
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science Physics

Published : 8 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 8 Documents
Search

 1 
Supplementation of Fermented Moringa Leaves in Feed on Blood Glucose of Striped Catfish (Pangasianodon hypophthalmus) Infected with Aeromonas hydrophila Windarti Windarti; Irwan Effendi; Ronal Kurniawan; Mega Novia Putri; Dimas Gusriansyah; Okta Rizal Karsih
Jurnal Natur Indonesia Vol. 22 No. 2 (2024): October
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.2.92-99

Abstract

Moringa leaves can be used as an herbal plant in fish growth to prevent and treat bacterial infections. This study aims to determine the effect of fermented moringa leaves through feed on blood glucose in striped catfish (Pangasianodon hypophthalmus). This research was conducted from September to November 2023 at the Marine Biotechnology Laboratory, Faculty of Fisheries and Marine Sciences, Riau University. The method used is an experimental method using a completely randomized design with 4 (four) treatments and 3 (three) replicates; the treatment dose of fermented moringa leaves is T0 (control), T1 (10 g/kg feed), T2 (15 g/kg feed), and P3 (20 g/kg feed). The catfish measured 5.00 ± 1.00 cm and weighed 4.00 ± 0.50 g, reared in an 80 L tank at a stocking density of 1 fish / 4 L water. The maintenance was carried out for 60 days, and blood glucose observations were made at the beginning (H-1), day 30 (H-30), day 60 (H-60), and post-challenge test (H-75). The results showed that adding fermented moringa leaves to the diet did not affect the blood glucose of the catfish (p>0.05). This indicates that moringa leaves can keep the fish in normal condition after being challenged with Aeromonas hydrophila bacteria
THE POTENTIAL OF BANDOTAN LEAVES (Ageratum conyzoides L.) AS AN IMMUNOSTIMULANT AND ANTIBACTERIAL AGENT IN AQUACULTURE: A REVIEW Nur Ikhlas Syuhada; Ronal Kurniawan; Okta Rizal Karsih; M Irsyad Nur
Asian Journal of Aquatic Sciences Vol. 9 No. 1 (2026): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.9.1.1-8

Abstract

Aquaculture intensification increases fish susceptibility to infectious diseases, prompting the search for natural alternatives to reduce dependence on synthetic chemicals. Bandotan leaves (Ageratum conyzoides L.) of the Asteraceae family contain secondary metabolites, including flavonoids, alkaloids, terpenoids, and saponins, with antibacterial, antioxidant, and immunomodulatory activities. This literature review aims to analyze the potential of bandotan leaves as a natural immunostimulant and antibacterial agent in aquaculture, focusing on their phytochemical content, mechanism of action, and safety. This study used a literature review method, conducting searches across national and international journal databases, university repositories, and research institute publications. The inclusion criteria included articles discussing the biological aspects, phytochemical content, antibacterial activity, immunomodulatory effects, physiological parameters, histology, and safety of bandotan leaves in the context of aquaculture. The results of the study showed that bandotan leaf extract effectively inhibited the growth of pathogenic bacteria in fish by disrupting cell membrane integrity and inhibiting bacterial enzymes. Its bioactive compounds enhance immune response, antioxidant activity, and reduce metabolic stress in fish. However, its application faces challenges in determining the optimal dosage, assessing histopathological effects, and managing potential respiratory distress at high concentrations. Further research is needed to optimize the formulation, understand the molecular mechanisms, and ensure the long-term safety of bandotan leaf use in sustainable fish farming systems.
Analysis of Oceanographic Physical Parameters at Sako Bungus Beach Athiyyah Salwaa Andini; Nabila Afifah Azuga; Okta Rizal Karsih; Ronal Kurniawan; Fharisa Nabila Rizvi
Tropical Marine Environmental Sciences Vol. 4 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/tromes.4.2.55-59

Abstract

This study was conducted at Sako Beach, Bungus Teluk Kabung District, Padang City, West Sumatra, to analyze the physical parameters of the water and examine changes in the shoreline occurring in the area. Data collection was conducted in November 2024 at five observation stations located using GPS. The measured parameters included water temperature, salinity, current velocity, and beach slope. The results showed that water temperatures ranged from 34 to 35°C, which is relatively high for tropical coastal waters. Salinity values ranged from 15 to 22 ppt, indicating brackish water characteristics and the influence of freshwater runoff from the land. Current velocity ranged from 0.1 to 0.25 m/s, falling into the category of weak to moderate currents, while the beach slope ranged from 0.744° to 2.919°, indicating a gently sloping beach. These physical conditions are interrelated and play a role in coastal dynamics, particularly in sediment distribution. Analysis of shoreline changes indicates that Sako Beach is undergoing accretion, or land gain, driven by sedimentation. The gentle slope influences this process, as does relatively low wave energy and the potential contribution of terrestrial runoff. The results of this study show that the dynamics of physical water parameters play a significant role in shaping changes in coastal morphology; therefore, periodic monitoring is necessary to support sustainable coastal zone management
Bathymetric Mapping Techniques for Shallow Marine Waters Using Satellite Image Data at the Oceanographic Research Center (P2O)-LIPI in Jakarta Nabila Afifah Azuga; Fharisa Nabila Rizvi; Okta Rizal Karsih; Ronal Kurniawan
Tropical Marine Environmental Sciences Vol. 4 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/tromes.4.2.50-54

Abstract

An application is a subclass of computer software that utilizes the computer’s capabilities directly to perform a task desired by the user. The purpose of this study was to investigate bathymetric mapping techniques using Planet Scope satellite imagery and methods for processing data collected in the field. The research was conducted from January to February 2019 at the Remote Sensing Laboratory of the Oceanography Research Center, Indonesian Institute of Sciences (P2O-LIPI), East Ancol, North Jakarta. The methods used during this internship included active participation and literature review. To this context, the author processed satellite image data and analyzed the data using a laptop equipped with ArcGIS 10.5, Microsoft Excel, and ENVI 5.3. The results from data processed manually to determine absolute depth exhibited a higher level of accuracy ompared to data processed automatically
Tsunami Ready Community Facilitator Certified Internship at the Banjarnegara Geophysical Station Fawwaz Atthoriq; Fharisa Nabila Rizvi; Ronal Kurniawan; Okta Rizal Karsih
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.62-66

Abstract

Cilacap Regency is one of the regencies that serves as a disaster supermarket/laboratory. This means that Cilacap is at risk of disasters, including earthquakes, floods, landslides, and tsunamis. The objective is to assess community preparedness, specifically in the villages of Banjarsari and Nusawungu, and to prepare for earthquakes and tsunamis involving all components of society, both the government and the community itself, to achieve zero victims. This research was conducted from August to December 2023. Observations were made at the Banjarnegara Geophysical Station on Jalan Raya Banjarmangu Km. 12, Kalilunjar Village, Banjarmangu District, Banjarnegara Regency, Central Java. The method used in model the earthquake source mechanism was the P-wave first-impulse. The input to this system was waveform data from the InaTEWS network, which was entered via the internet using the Seedlink Protocol and then processed to enable automatic picking. The results were then used as input to determine the earthquake parameters and source mechanism in just a few seconds. Lightning observations are conducted using real-time recordings of atmospheric electrical events by the Lightning/2000 software, which are recorded in the format of atmospheric electrical event reports for one day, calculated from 00:00 to 24:00 local time. This is used to archive lightning event data for further processing in lightning mapping. The Tsunami Ready Community is a program to enhance community capacity in facing tsunami threats based on 12 indicators established by UNESCO-IOC. The hope is that the community will always be prepared and not be caught off guard in facing earthquake and tsunami threats
THE EFFECTIVENESS OF Cosmos caudatus IN PREVENTING HYPERGLYCEMIA DUE TO Aeromonas hydrophila INFECTION IN Pangasianodon hypophthalmus Ronal Kurniawan; Windarti Windarti; Irwan Effendi; Asmika Harnalin Simarmata; Efawani Efawani; Rodhi Firmansyah; Nur Ikhlas Syuhada; Okta Rizal Karsih
Asian Journal of Aquatic Sciences Vol. 8 No. 3 (2025): December
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.8.3.319-326

Abstract

Cosmos caudatus is a herb that benefits overall health. This study aimed to determine the effect of C. caudatus leaf supplementation in feed on blood glucose levels in catfish (Pangasianodon hypophthalmus) challenged with Aeromonas hydrophila. This study was conducted from March to August 2024 at the Marine Microbiology Laboratory, Faculty of Fisheries and Marine Sciences, Universitas Riau. The method used was an experimental design employing a completely randomized design (CRD) with four treatments and three replications: negative control (NC, no supplementation, no infection), positive control (PC, no supplementation, with A. hydrophila bacterial infection), supplementation with C. caudatus at doses of 10 g/kg (T1), 15 g/kg (T2), and 20 g/kg (T3) of feed, all tested against A. hydrophila. The fish fry used weighed 5.00 ± 1.00 g and were reared for 75 days in 100-L tanks integrated with an aquaponics system. The fish were fed the experimental feed for 60 days before challenge with A. hydrophila bacteria (10⁸ CFU/mL, intramuscular injection) and continued for 14 days after challenge. Blood glucose levels were measured at the beginning (day 1), day 30, pre-challenge (day 60), and post-challenge (day 75). The results showed that adding basil leaves to the feed affected blood glucose (P<0.05). The addition of C. Caudatus leaves maintained glucose homeostasis within the range of 68.33±10.59-79.67±7.77 mg/dL. These findings indicate that C. Caudatus supplementation effectively prevents hyperglycemia caused by A. hydrohila infection in striped catfish and suggest its potential as a natural immunostimulant and metabolic modulator in aquaculture
The Effect of Work Discipline on Employee Performance at the Regional Disaster Management Agency (BPBD) of Pekanbaru City Ade Nanda Febrian Siregar; Annisa Meliana; Okta Rizal Karsih; Fharisa Nabila Rizvi; Ronal Kurniawan
South East Asian Management Concern Vol. 3 No. 2 (2026): May
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamac.3.2.36-39

Abstract

Human resources play a crucial role in realizing the company's established vision, mission, and objectives, and can significantly determine the company's actual achievements, given the available resources. Work discipline plays a crucial role in realizing the company's established vision, mission, and objectives, and can significantly determine the company's actual achievements given the available resources. The work discipline instilled by an organization or company in its employees greatly influences employees' dedication to their work. Employee performance is the tangible behavior of each individual regarding the results of their work for the company, so that each employee's work results differ from those of others. An individual's performance, whether good or poor, will significantly impact an organization's ability to achieve its goals. High performance fosters greater employee loyalty to the organization, increases motivation, and allows employees to enjoy the work they perform; however, it can sometimes leave individuals unable to escape the pressures of their work.  The research method employed uses questionnaires or interviews for data collection; thus, the data sources are referred to as respondents. Work discipline has a positive and significant influence on employee performance at the Regional Disaster Management Agency (BPBD) office in Pekanbaru City, as evidenced by the t-test, which indicates that the calculated t-value is greater than the critical t-value (7.038).
Analysis of Distributive, Procedural and Interactional Service Recovery and Its Impact on Customer Satisfaction of J&T Courier Services in Pekanbaru City Nuryuni Nabila; Annisa Meliana; Fharisa Nabila Rizvi; Ronal Kurniawan; Okta Rizal Karsih
South East Asian Management Concern Vol. 3 No. 2 (2026): May
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamac.3.2.40-43

Abstract

The courier industry in Indonesia has experienced significant growth in recent years, driven by the rapid expansion of e-commerce and increased online shopping activity. This study is based on the fact that many customer complaints regarding J&T services, such as late deliveries, damaged goods, and difficulties communicating with couriers, remain, despite J&T being one of the courier service companies with the highest market share in Indonesia. This study aims to analyze the effects of service recovery on distributive, procedural, and interactional justice. The study was conducted from August to September 2025. The method used was quantitative, with a descriptive approach. Data were collected through questionnaires administered to 100 residents of Pekanbaru City who had used J&T services and experienced delivery-related complaints. The analysis technique used was multiple linear regression in SPSS. The results show that, both partially and simultaneously, distributive, procedural, and interactional service recovery have a positive and significant influence on customer satisfaction. This implies that the better the company handles complaints using an appropriate justice approach, the higher the customer satisfaction
Co-Authors Ade Nanda Febrian Siregar Annisa Meliana Asmika Harnalin Simarmata Athiyyah Salwaa Andini Dimas Gusriansyah Efawani Efawani Fawwaz Atthoriq Fharisa Nabila Rizvi Irwan Effendi M Irsyad Nur Mega Novia Putri Nabila Afifah Azuga Nur Ikhlas Syuhada Nur Ikhlas Syuhada Nuryuni Nabila Rodhi Firmansyah Ronal Kurniawan Ronal Kurniawan Windarti Windarti