Henky Irawan
@umrah.ac.id
Aquaculture
Universitas Maritim Raja Ali Haji (UMRAH)
RESEARCH, TEACHING, or OTHER INTERESTS
Agricultural and Biological Sciences, Aquatic Science, Biotechnology
Scopus Publications
Scopus Publications
Mirza Ayunda Pratiwi, Henky Irawan, Nola Ritha, Dony Apdillah, and Myrna Sofia
IOP Publishing
Abstract This study explores the role of Knowledge Management (KM) in supporting coastal conservation through local youth empowerment in the Riau Islands, Indonesia, where 98% of the territory consists of marine areas. While coastal conservation has traditionally focused on ecological and biological aspects, this research emphasizes its human dimension by framing conservation as both an ecological practice and an informal learning process. The main objective of this study is to document and analyze the process and flow of Knowledge Management applied in coastal conservation activities, particularly those involving Generation Z (GenZ) who are engaged in conservation efforts. Using an exploratory qualitative approach, data were collected through focus group discussions with experts and GenZ participants involved in conservation programs, semi-structured interviews with conservation academics, NGOs, and practitioners, field observations, and document analysis. The data were thematically analyzed using NVivo software. The findings reveal that the KM process operates through five interrelated stages: capture (digital documentation of field experiences), sharing (exchange of insights through workshops and social media), application (implementation of eco innovation practices), retention (archiving of knowledge and mentoring of new volunteers), and evaluation (assessment of ecological and learning outcomes). Through KM, conservation activities extend beyond planting and monitoring to systematically transforming tacit knowledge into explicit, shareable forms, thereby increasing their long-term impact on environmental sustainability. Moreover, active youth participants serve as change agents who inspire wider community awareness and foster pro-environmental behavior. The adoption KM processes in their conservation programs, they can achieve greater effectiveness, continuity, and overall success in sustaining coastal ecosystems.
Nola Ritha, Nurul Hayaty, Dony Apdillah, Henky Irawan, Sahra Fatimah Yasir, and Silvia Indah Maharani
IOP Publishing
Abstract Seagrass meadows play vital ecological roles by supporting biodiversity, stabilizing sediments, and maintaining coastal productivity. However, species-level monitoring in tropical waters remains difficult due to high turbidity, uneven illumination, and overlapping morphology that hinder visual identification. Traditional field surveys are time-consuming and inconsistent, underscoring the need for automated and scalable approaches. Deep learning–based object detection offers promising solutions but remains underexplored in tropical seagrass ecosystems. This study employs Faster R-CNN and Single Shot MultiBox Detector (SSD) on a unique in-situ underwater dataset from the Riau Islands, Indonesia, to establish baseline detection performance under real environmental conditions. A total of 1,480 images were enhanced using CLAHE, LAB color correction, and sharpening, then divided into training and validation sets. Model performance was assessed using mAP at IoU thresholds 0.50 and 0.75, precision, recall, and inference time. Faster R-CNN achieved higher mAP (38.69%) than SSD (31.35%) but required longer processing. These findings highlight trade-offs between accuracy and speed and form the first baseline for automated seagrass detection in Indonesia.
Muzahar Muzahar, Rika Wulandari, Dwi Septiani Putri, Tri Yulianto, Henky Irawan, and Okto Rimandi Bakkara
EDP Sciences
This study aimed to determine the successive level of fission technique on several sea cucumbers (Holothuroidea) in littoral zone of Madong Bay, Tanjungpinang. The fission technique was performed by tying the middle part of the sea cucumber’s body using a rubber band. Parameters observed were composed of: (a) the occurrence of autotomy on pre- and post-treatment period, (b) successive rate of fission technique (%), (c) fission duration, (d) survival rate on post-treatment period. All data were analyzed descriptively. The results showed that: (1) Only gold sea cucumber Stichopus chloronotus that could perform autotomy on post- treatment period, (2) The successive rate of fission technique on Stichopus chloronotus and Holothuria atra was 83.33% and 33.33%, respectively, while fission was absent on Holothuria scabra and Holothuria sp. (0%), (3) The fastest fission process was found on Stichopus chloronotus at 1.2 hours, after applying the fission technique at 24±2 hours and Holothuria atra was at 24-48 hours, (4) The survival rate on post-treatment period was 66.67% in Stichopus chloronotus and 41.67% in Holothuria atra, while Holothuria scabra was 66.67% and Holothuria sp. was 11.11%. Fission technique is more suitable for Stichopus chloronotus as an alternative method for seed supply in grow-out culture activities.
Dwi Septiani Putri, Shavika Miranti, Rika Wulandari, Muzahar Muzahar, Tri Yulianto, Okto Rimandi Bakkara, Henky Irawan, and Zubandi Zubandi
EDP Sciences
Fish silage is a liquid product produced from whole or part of a fish processed by fermentation utilizing the activity of enzymes produced by microba. The fermentation process can be carried out chemically or biological. The purpose of this research is to determine the nutritional content of fish silage fermented using Sorbic Acid and EM4. This research uses an experimental method by mixing cleaned fish with 3% Sorbic Acid and 20% EM4. The highest protein content is found in fish silage fermented with Sorbic Acid, that is 55.05% followed by fat and carbohydrate content of 22.01% and 19.61%. Meanwhile the protein content of fish silage fermented with EM4 is 26.55%. Research results show that fish silage fermented with Sorbic Acid has the best performance by increasing the protein content of the silage.
Raihan Syahrul Maurid, Rika Wulandari, Shavika Miranti, Dwi Septiani Putri, Muzahar Muzahar, Tri Yulianto, Okto Rimandi Bakkara, and Henky Irawan
EDP Sciences
Grouper is a mainstay commodity for mariculture in Indonesia. One of the obstacles in cultivating grouper fish in floating net cages is the infection of the hirudinea sea leech Zeylanicobdella sp. Leech infection causes fish growth to be stunted and they may not even be sold. The aim of this research is to determine the effect of adding moringa leaf extract (Moringa oleifera) and its effective dose which can kill sea leeches. This research was carried out in November – December 2023 for 30 days located at the Pengujan Fish Seed Center (BBI), Bintan Regency, Riau Islands Province. This research includes making extracts using 96% ethanol solvent, qualitatively testing the active content of simplicia, probit analysis of extracts on Artemia salina test animals and testing extracts on the leech Zeylanicobdella sp. The graded extract doses used for the LC-50 test on Artemia salina are 20 ppm, 40 ppm and 60 ppm. Meanwhile, the dose for testing on the leech Zeylanicobdella sp. namely 10 ppm, 20 ppm and 30 ppm. Determination of dosage for leeches is based on the LC50-24 value. The research results showed that the percentage of water content was 81,73% and the total yield was 9.25%. The results of the phytochemical test showed that 96% ethanol was successful in attracting bioactive compounds such as alkaloids, flavonoids, saponins and tannins. The LC50-24 hour value shows that the dose of Moringa leaf extract that can cause 50% death of test animals is 30,549 ppm and the best dose that can kill Zeylanicobdella sp. leeches namely a concentration of 30,549 ppm.
Heriyanti Heriyanti, Yunika Eka Putri, Hengky Irawan, Tengku Said Raza'i, Indra Lasmana Tarigan, Elis Kartika, Budiyati Ichwan, and Madyawati Latief
Lembaga Penelitian dan Pengabdian masyarakat Universitas Jambi
— Perepat (Sonneratia alba) is a plant widely reported to have potential as a natural medicine. Encapsulation technology was developed to prevent damage to bioactive compounds in medicinal plant extracts. This study aimed to analyze the physical and chemical properties of ethanol extract of ( S. alba ) leaves and encapsulants of ethanol extract of perepat leaves with maltodextrin coating material as an antioxidant supplement and analyze the encapsule bioavailability. Characterization was carried out using the Fourier Transform Infrared Spectroscopy (FT-IR) method and UV-Vis Spectrophotometer. The results showed that the highest percentage of extract and encapsulation yield was PKL 39.812% and 59.54% respectively. The highest total phenol and flavonoid content of S. alba leaf ethanol extract was PKL at 171.88 mgGAE/g and 25.473 mgQE/g, respectively, with the highest antioxidant activity of ethanol extract PKL IC 50 3.544 μg/mL. In addition, the solubility level of encapsulated S. alba leaf ethanol extract in water was the highest PKL at 97.950%. The highest total phenol and flavonoid encapsulation was PKL 44.63 (mgGAE/g) and 6.357 (mgQE/g) respectively, with an antioxidant value of IC 50 54.608 μg/mL. Furthermore, the IR spectrum also shows the presence of typical functional groups such as C-H Alkane, C-H Alkene functional group, C-H aromatic ring functional group, O-H functional group, hydrogen bond alcohol/phenol, C=C alkene C=O Carbonyl, single C-OH/C-OR and others confirm the formation of cross-linking in the encapsulation process. This research has shown that the encapsulation of ethanol extract alba leaves had good potential for a functional food candidate.
Aminatul Zahra, Okto Rimandi Bakkara, Shavika Miranti, Henky Irawan, Rika Wulandari, Muzahar Muzahar, and Tri Yulianto
EDP Sciences
One common disease that attacks hybrid grouper is marine leech (Zeylanicobdella sp.). Therefore, it is necessary to take safe and environmentally friendly treatment steps, namely bathing fish infected with marine leeches with rosemary solution. This research examined the application of rosemary solution with different concentrations and bathing times to decrease the intensity of marine leech infections in “cantang” hybrid grouper (Epinephelus fuscoguttatus x Epinephelus lanceolatus). The experimental design of this research was a randomized factorial design (rosemary solution concentration factor and bathing time factor) with three replications. This experimental’s treatments were a combination of rosemary solution concentrations (0, 7.5, and 15 mL/L) and bathing times (20, 40, and 60 minutes). The experiment showed that the interaction of concentration and bathing time of rosemary significantly eliminate the number of leeches in “cantang” hybrid grouper. The rosemary solution at concentrations of 15 mL/L and 7.5 mL/L significantly differed from the control; 15 mL/L was the best concentration for reducing leeches intensity, with an average intensity reduction of 29.91%. The best duration of bathing rosemary to decrease the intensity of leeches in “cantang” hybrid grouper is 60 minutes, with an average reduction in intensity of 19.21%. However, the concentration and duration of bathing in rosemary solution could not decrease the prevalence of leeches in “cantang” hybrid grouper. Bathing grouper fish in rosemary solution at a dose of 15 mL/L for 60 minutes is the best treatment to decrease the intensity of leech attacks on grouper fish by 44.85%. Bathing hybrid grouper with rosemary solution is one solution to decrease the intensity of marine leech attacks on fish farming.
Henky Irawan, Ery Subhiyanti, and Daffa Alfathin Erkyawan
EDP Sciences
This research aims to evaluate the effectiveness and efficiency of planting mangroves Rhizophora sp using hydroponic saplings compared to conventional polybag saplings. The hydroponic method was tested to increase the efficiency of mangrove planting through effective effectiveness that is lighter and easier to carry in large quantities. This research involves planting mangrove seedlings on a field scale using both methods. The results showed that hydroponic saplings had better effectiveness and efficiency performance than polybag saplings. The advantages of hydroponic saplings in terms of portability and the ability to plant in large quantities can be an attractive alternative in conservation and rehabilitation efforts for mangrove ecosystems. The results of this research indicate that the use of hydroponic saplings in planting can increase effectiveness by 4,512-5,869%, where 1 person can carry 294-385 saplings compared to saplings in small size polybags where 1 person can only carry 7 saplings and can achieve efficiency by 2 %, where 1 Ha only requires 7-9 people compared to saplings in large polybags where 382-384 people have to carry them people, which means it can reduce the number of people 98 % that perform significantly improve from polybag saplings.
Muzahar Muzahar, Rika Wulandari, Dwi Septiani Putri, Tri Yulianto, and Henky Irawan
EDP Sciences
The seaweed culture activities are relatively new and only few people perform them in Lingga District. Specifically, Kappaphycus striatum has recently been cultured for the last three culture periods. This condition causes the seaweed culturists have no appropriate data associated with a proper culture method, following the water characteristics around the culture area. A study regarding the different culture methods on the growth performance of K. striatum in Pelakak Village waters, Lingga District, Riau Islands has never been reported. This study aimed to determine the effect of different culture methods on the growth performance of Kappaphycus striatum seaweed. This study used a completely randomized block design with three treatments and three replications, namely bottom method (P1), off-bottom (P2), and longline method (P3). There were 351 seaweed seeds with 100 g weight per each seed, that are placed in nine culture plots. The culture plot was constructed as a 4 m × 1.5 m square with wooden stakes at both ends and polyethylene ropes installed at a distance of 0.5 m. Each rope stretch was tied at 0.3 m distance for seed planting. Parameters observed in this study were absolute growth rate, specific growth rate, and production rate of the seaweed. The results showed that the absolute growth rate, specific growth rate, and production rate were affected by the culture method (p<0.05). The seaweed group reared in a longline method (P3) obtained the best results, compared to other methods, at 2.34% per day for specific growth rate and 245.7 g/m2 for production rate. Therefore, the longline method can be applied in the Pelakak Village waters, Lingga District.
Aurigha Haidar Brabo, Indri Addini, and Henky Irawan
IOP Publishing
Abstract The increase of the organic carbon in the environment that was not followed by carbon adsorbents will trigger climate change that contributes to global warming. The mangrove forest is the ecosystem that can absorb carbon emission from the environment and reserve it in its leaves, stems, and sediment. This research aimed to show the information related to the estimated organic carbon value stored in the mangrove forest’s sediments on Dompak Island. This research was conducted in December 2020 at Dompak Island, Riau Islands. Carbon stock data was evaluated using the LOI (Loss On Ignition) method. The sediment specimens were collected from 5 stations. The result showed that the north station has the highest carbon content, 443.1 tons C/ha, and the south station has the lowest carbon content, 223.65 tons C/ha. The result from the statistic analysis using a one-way ANOVA test between the locations showed that the organic value carbon content in Dompak Island with the significance value of 0.05 stated that there is no real difference.
Sintana Tri Yuniar, Anasha Nugrahaini Virizki, Dilla Sahilla, Jumari, Muhammad Fajri, Mhd Habib Praditya, Pajri Febriansyah, Raquel Manalu, Zefri Khalik Kurniadi, Iqbal Maulana Yusuf Sanjaya,et al.
IOP Publishing
Abstract Rhizophora sp has a single root. The shape of the roots, which are like anchors, is what makes mangroves wave absorbers, sediment binder, and so on. One of the functions of mangrove roots is to prevent the release of garbage into the open sea. This is due to the shape of the roots that make garbage snagged (caught) on the sidelines of the roots. The purpose of this study was to analyze the capture of marine debris in the mangrove roots of Rhizophora sp in the Sengarang Besar ecosystem. This research was conducted in December 2021 in the mangrove forest of Senggarang Besar. The method used is the line transect method with 10 Rhizophora sp mangrove trees located on the coast. Then, data analysis on the density of waste caught in the mangrove roots of Rhizophora sp. The results showed that the inorganic waste found in the mangrove roots of Rhizophora sp were plastic waste, metal waste, glass waste, rubber waste, and cloth waste. Plastic waste is the highest waste catch in the mangrove ecosystem of the Great Senggarang beach. Then the data that has been taken is analyzed using Pearson correlation to prove whether there is a relationship between the circumference and the type of garbage caught. The results of the Pearson correlation between cloth and plastic with root circumference were -0.30 and -0.04 (no correlation between the two variables); Pearson glass correlation with root circumference was 0.45 (sufficient correlation); Pearson rubber correlation with circumference is 0.71 (strong correlation). It can be concluded that there are other factors such as geographical influences, ocean currents, and others in the catch of garbage at mangrove roots.
Sintana Tri Yuniar, Anasha Nugrahaini Virizki, Dilla Sahilla, Jumari, Muhammad Fajri, Mhd Habib Praditya, Pajri Febriansyah, Raquel Manalu, Zefri Khalik Kurniadi, Iqbal Maulana Yusuf Sanjaya,et al.
IOP Publishing
Abstract Rhizopora sp has a single root. The shape of the roots, which are like anchors, is what makes mangroves a wave absorber, sediment binder, and so on. One of the functions of mangrove roots is to prevent the release of garbage into the open sea. This is due to the shape of the roots that make garbage snagged (caught) on the sidelines of the roots. The purpose of this study was to analyze the capture of marine debris in the mangrove roots of Rhizopora sp in the Sengarang Besar ecosystem. This research was conducted in December 2021 in the mangrove forest of Senggarang Besar. The method used is the line transect method with 10 Rhizopora sp mangrove trees located on the coast. Then, data analysis on the density of waste caught in the mangrove roots of Rhizopora sp. The results showed that the inorganic waste found in the mangrove roots of Rhizopora sp were plastic waste, metal waste, glass waste, rubber waste, and cloth waste. Plastic waste is the highest waste catch in the mangrove ecosystem of the Great Senggarang beach. Then the data that has been taken is analyzed using Pearson correlation to prove whether there is a relationship between the circumference and the type of garbage caught. The results of the Pearson correlation between cloth and plastic with root circumference were -0.30 and -0.04 (no correlation between the two variables); Pearson glass correlation with root circumference was 0.45 (sufficient correlation); Pearson rubber correlation with circumference is 0.71 (strong correlation). It can be concluded that there are other factors such as geographical influences, ocean currents and others in the catch of garbage at mangrove roots.
Henky Irawan
EDP Sciences
Floating cages are the technology used for aquaculture activities. The dynamic factors of the sea will affect the floating cage, one factor is the waves. The waves cause a change in the position of the floating cage that affects the stability of the floating cage. The floating cage needs should have a balancing unit for stability. The model of a floating cage with a vacuum balancing unit is for a function to perform a stable position when exposed to sea waves. This research was executed by comparing models of the floating cages without a vacuum balancing unit with the floating cages installed with a vacuum balancing unit. The stability in each model is tested by comparing the two models of floating cages, exposed to the naturally wavy sea, for the changing in position was measured with the accelerometer data logger installed on each floating cage model. The sorted data of each data logger of the two models with identical sequences on the X and Y axes for comparison purposes. The results show that the value of the change in position is smaller for the floating cage installed in the vacuum balancing unit to perform more stability.
R Pramana, Akhirman, and H Irawan
IOP Publishing
Abstract The small islands are suitable as Aquaculture location for Sandfishes Holothuria scabra, because of the pristine water conditions. The harvested Sandfishes sometimes marketed dried, but most of it marketed fresh because the drying process took a long time using the sun heat, and needs fully standby if use heat from firewood. Both methods have conditions that depend on nature; if in rainy weather, the sun heat is unavailable and firewood becomes wet, that makes fire unavailable so that the drying process should stop. The alternative energy sources on the small island potentially used for drying the Sandfishes are the communal electricity, which commonly operates for 12 hours, and the Liquid Petroleum Gas (LPG) 3 Kg that is regularly using for daily cooking purposes. Using electric energy and LPG for drying can apply to an oven. Drying experiment results at a temperature of 50 °C for 12 hours in an electric oven gained average weight shrinkage of 83.9%, and LPG gained an average weight loss of 87.8% were significantly different based on the Independent Samples t-Test. Cost for 12 hours of electricity consumption is IDR 3,960 lower than the LPG consumption, which is IDR 5,833. Oven production capacity is 32 fresh Sandfishes weight of 500 g, which produces Sandfishes dry weight around 2 kg within the selling price class of IDR 2.2 million/kg.
H Irawan, R Yude, M P Suhana, A Suryanti, D Kurniawan, A Zahra, R D Putra, T S Razai, A H Yunianto, and A D Syakti
IOP Publishing
Abstract Corals are cultured as a multiplication effort to conserve the recovery of coral reef ecosystems in natural habitat or sold as ornamental biota for saltwater aquariums. Coral cultured requires a substrate for the enlargement of transplanted coral tillers, where the substrate must be in accordance with the needs and conditions of the aquatic environment. This assembled concrete reefs as a stand is designed to be resistant to the conditions of the monsoon season sea waters. Artificial reefs made of concrete designed with concrete beam where each beam has a dimension of 1 m in length, 10 cm in width and 10 cm in height are arranged in specific form so that it is easy to assemble to place on the seabed. The test results shown that this structure for 12 months on the seabed is still intact, the position of the structure has not shifted, the transplanted coral has remained attached, natural epiphytes already attached after 1 month and are attached until next 11 months.
R. D. Putra, M. P. Suhana, D. Kurniawn, M. Abrar, R. M. Siringoringo, N. W. P. Sari, H. Irawan, E. Prayetno, T. Apriadi, and A. Suryanti
Author(s)
Satellite monitoring thermal stress on the coral reef is of fundamental importance to understand coral bleaching phenomenon. The new phenomenon of global coral bleaching events is caused highly vis...
Risandi Dwirama Putra, Tri Apriadi, Ani Suryanti, Henky Irawan, Tengku Said Raja'I, Try Yulianto, Wiwin Kusuma Atmadja, and Chandra Joei Koenawan
EDP Sciences
Bauxite production and exploration give negative impact environmental modification and increasing concern pollution of heavy metals. One of an alternative to reduce the negative impact of bauxite post-mining production is by re-utilizing the abandoned bauxite land and necessary exploratory study to obtain the current environmental conditions primarily related to heavy metals in bauxite mining area. Soil and water quality samples from 5 (five) sites based on post-mining activities were used to determine concentration heavy metals of As, Cd, Pb, Zn, Cr, Cu from different soil level. They were also collected for grain size analysis including those of sand and mud percentages along with the mean, and sorting analysis. The mean grain size post-mining bauxite ranged between very fine sand to medium sand and had heterogeneous texture. The coarse grain size percentage increased towards the bottom of the soil. Total heavy metal contents for post-mining bauxite soils are 0,081 ppm, 0,245 to 0,471 ppm and 0,007 ppm for As, Pb and Cd respectively. Heavy metals for Cd, uniformly at every depth from soil level. On the other hand, Pb showed significance pattern, it was indicated every depth from soil level, the concentration of Pb was different.
Risandi Dwirama Putra, Ani Suryanti, Dedi Kurniawan, Arif Pratomo, Henky Irawan, Tengku Said Raja'I, Rika Kurniawan, Ginanjar Pratama, and Jumsurizal
EDP Sciences
Coral reefs are one of the most highly productive marine ecosystems, with the largest transfer of energy attributed to the trophic interaction between herbivores and algae. Rapid demographic growth, leading to transmigration to small islands such as Natuna Island where located on outer Island Indonesia.The aim of the present study is to test for significant associations between herbivore fish species traits and Habitat complexity was derived from coral reef cover. Method to record each observed herbivore fish species with UVC (Underwater Visual Census) using SCUBA diving equipment along modification line transects. A total of 39 different fish species belonging to 3 families‟ herbivore fish were identified. Total biomass of herbivorous fish correlated with Dead Coral Algae (DCA). Biplot of the first two axes for the nonmetric multidimensional a scaling (NMDS) analysis for family and grazer showed the dominance of herbivore fish grazer.
Henky Irawan, Verapong Vuthiphandchai, and Subuntith Nimrat
Elsevier BV