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Journal of Coastal and Ocean Sciences
Published by Universitas Riau
ISSN : 27454355     EISSN : 27464512     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Physics
Journal of Coastal and Ocean Sciences is a journal publishes scientific articles from research by lecturers and other researchers in the marine sector. Covers aspects of biology, physics and chemistry, both for brackish waters (mangrove swamps, river estuaries) and marine waters (coastal and offshore seas).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 10 Documents
 1 
Search results for , issue "Vol. 6 No. 2 (2025): May" : 10 Documents clear
Structure of Macrozoobenthos Community in the Coastal Intertidal Zone, Marapalam South Coast Regency, West Sumatra Asmawi, Dandi; Tanjung, Afrizal; Nasution, Syafrudin
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.84-93

Abstract

Macrobenthos is a community of organisms that spend part or all of their life cycle on the bottom of the waters, either crawling, sessile, or digging holes. This study aims to analyze the structure of the macrobenthos community in the intertidal zone of Marapalam Beach, South Coast Regency, West Sumatra Province. Sampling was carried out at three stations. Station I (mangrove), Station II (tourist spot), and Station III (fishing boat). Macrobenthos sampling used the purposive sampling method. Macrobenthos sampling at the bottom of the waters using a shovel, the substrate was filtered using a 1 mm2 mesh size sieve to separate the organism samples from the substrate. The results showed that the macrobenthos found on Marapalam Beach consisted of 2 classes and five families, five genera, and nine species of macrobenthos. The highest abundance of macrobenthos was found in the species Clypeomorus batillariaeformis. Diversity of research locations (H' 1.19), Dominance (C 0.17), Diversity (E 0.87), Clustered distribution patterns (Id 5.51), and similarity indexes of 71-100% are categorized as high species similarity
Abundance and Diversity of Sponges in the Waters of Pasumpahan Island, West Sumatra Rusdi, Muhammad; Efriyeldi, Efriyeldi; Thamrin, Thamrin
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.119-124

Abstract

Sponges are the most primitive multicellular animals that live in various types of waters, ranging from fresh to brackish and marine. Sponges live at the bottom of the water, usually embedding themselves in rigid substrates such as rocks or corals and competing with other attached organisms for food space. This study aimed to analyse the abundance and diversity and determine the differences in sponge abundance at different depths. This research was conducted in March 2024 in Pasumpahan Island, West Sumatra. This research used the survey method and the belt transect method. The sampling location was divided into three stations consisting of 3 sampling points. Station I is located in the tourist area, Station II is in the dock area, and Station III is in the area facing the open sea. The results showed that the highest abundance based on depth was found at station I with a depth of 5 m, namely 1071.4 ind / ha and the lowest abundance at station II with a depth of 7 m, 714.286 ind / ha. The t-test results obtained a significant value of less than 0.05, namely 0.048, which means that the abundance of sponges at different depths is significantly different. The diversity index ranges from 1.930 to 2.013, indicating that the sponge diversity level in Pasumpahan Island waters is classified as moderate. The T-test results show a significant value of more than 0.05, namely 0.795, which means the abundance of sponges at two depths is significantly different
The Effect of Moon Phases on Gill Net Fishing Results in Penampi and Kelebuk Villages of Bengkalis Regency Sofian, Alifa Khansa; Nofrizal, Nofrizal; Jhonnerie, Romie; Fatmawati, Riska
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.125-131

Abstract

This study aims to examine the differences in gill net catch results with the lunar phase in Penampi Village and Kelebuk Village, Bengkalis Regency. Data were collected from January 5 to April 5, 2024, involving 15 fishermen (eight from Penampi Village and seven from Kelebuk Village). Global Positioning System (GPS) technology was used to record the route of the boats, the number of catches (tails), and the total weight (kg) during fishing activities. Statistical analysis using an independent t-test was conducted to evaluate the effect of the lunar phase on catch results. The study found that the lunar phase did not significantly affect the number of catches (fish). However, catch weight was significantly influenced by the dark lunar phase (173.9 kg) and the semi-dark phase (30.5 kg). This study provides important insights into gill net fishing practices in the region. Fishermen are advised to focus on fishing during the dark moon phase, as this period yields the highest catch weight. During the semi-dark phase, fishermen are advised to consider alternative strategies, such as adjusting fishing locations and times to improve catch outcomes. Additionally, weather and sea conditions should be monitored to support the success of fishing activities.
Identification of Microplastics Types and Abundance in Mussels (Glauconome virens) from Tanah Merah Coastal Waters Meranti Island, Riau Alwi, Ahmad; Amin, Bintal; Mubarak, Mubarak
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.78-83

Abstract

This study aims to analyze the types and abundance of microplastics in mussels (Glauconome virens) and differences in the abundance of microplastics between research stations in the coastal waters of Tanah Merah Village, Meranti Islands. Samples were taken from three different locations: residential areas, fishing ports, and mangrove areas. The number of mussel samples from the three stations was 54 individuals, with three size groups. Water quality parameters such as temperature, salinity, pH, and current speed were measured to determine the condition of the aquatic environment. Microplastics were analyzed using a microscope after going through a process of dissolving the mussel meat with a 10% KOH solution. The results showed that three types of microplastics were found, namely fiber, fragments, and films, with an average value of 46.50 particles/ind. Fiber type was the highest type found, followed by fragments and films. The highest abundance of microplastics was found in the mangrove area with an average value of 54.11 particles/ind, while the lowest was in the fishing port with 37.61 particles/ind. The abundance of microplastics in mussels showed significant differences (p<0.05) within the station. Possible causes of the difference were discussed
Effect of Detergent Concentration and Exposure Duration on the Growth of Heterotrophic Bacteria in Seawater Hafizh, Muhammad; Effendi, Irwan; Zulkifli, Zulkifli
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.71-77

Abstract

This research was conducted from June to July 2024 at the estuary of the Selat Morong River, Rupat District, Bengkalis Regency, Riau Province. This study aimed to examine the effect of different detergent concentrations on the growth of heterotrophic bacteria, as well as to investigate the influence of varying detergent exposure durations on their growth. The experimental method employed a two-factor completely randomized design (CRD) consisting of different detergent concentrations (Factor A) with five levels: A1 (0 ppm) as the control, A2 (3000 ppm), A3 (6000 ppm), A4 (9000 ppm), and A5 (12,000 ppm), and varying exposure durations (Factor B): 1 day, 6 days, 11 days, 16 days, and 21 days. The results showed that the logarithmic values of heterotrophic bacterial growth over the 21 days indicated the highest growth occurred on day 1 at a concentration of 0 ppm, with a value of 7.09 CFU/mL. However, bacterial growth declined over time, reaching its lowest point on day 11 at a concentration of 3000 ppm, with a value of 6.95 CFU/mL. Statistical analysis revealed that different concentrations and exposure durations had no statistically significant effect on the growth of heterotrophic bacteria (P>0.05), meaning that variations in detergent concentration and exposure time did not cause meaningful differences in bacterial growth under the experimental conditions. This study highlights the potential resistance of heterotrophic bacteria to detergent exposure. It provides a basis for further research into the resilience of microbial communities in marine environments affected by pollution.
Sensitivity Test of Pedada (Sonneratia alba) Leaf Extract Against the Growth of Staphylococcus aureus, Escherichia coli, and Aeromonas hydrophila Bacteria Wiya, Siti Ada; Wahyuni, Sri; Mursawal, Asri; Nursyirwani, Nursyirwani
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.114-118

Abstract

Sonneratia alba (Pedada) is one of the potential mangroves as a natural antibacterial because it contains secondary metabolites, such as flavonoids, saponins, steroids, tannins, and terpenoids. This study aimed to determine the inhibitory power of Pedada leaf extract in inhibiting the growth of Staphylococcus aureus, Escherichia coli, and Aeromonas hydrophila. The research method used is experimental, including sample preparation, extraction, and sensitivity tests using the Kirby-Bauer disc method. This study used 100%, 50%, 25%, and 12.5% extract doses, positive control (Oxytetracycline), and negative control (a quade). The results showed that Pedada leaf extract could inhibit the growth of pathogenic bacteria; 100% concentration was the concentration with the widest inhibition zone diameter of S. aureus 15.48 mm, E. coli 13.37 mm, and A. hydrophila 13.88 mm. Based on this study's results, the best extract concentration for inhibiting bacterial growth is 100% concentration
Types and Abundance of Beach Litter on the East Coast of Karimun Island, Riau Islands Ranti, Putri; Amin, Bintal; Mubarak, Mubarak
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.65-70

Abstract

This research was conducted in January 2025 on the East Coast of Karimun Island, Riau Islands Province. This study aimed to determine the type and abundance of Beach Litter on the East Coast of Karimun Island, Riau Islands Province. The method used in this research is a survey method with direct observation and data collection at the research location. The waste data obtained was analyzed statistically, and then the results were presented descriptively, referring to the supporting literature. The most dominant type of waste is plastic-type at Station I (Coastal Area), and the last type of waste obtained is rubber-type at Station II (Ketam Beach), for the results of the highest abundance between stations is found at Station I, namely 7,12 units/m² and the lowest abundance at station II, namely 0,84 units/m². In comparison, the abundance results between sampling times obtained the highest abundance during the Weekend of 19,48 units/m² and the lowest abundance during Weekday of 11,88 units/m². Based on the difference test of abundance between stations and between sampling times, there is a real or significant difference (P <0,05)
Abundance of Chaetodontidae Family Reef Fish and Coral Reef Condition in the Sikuai Island Area, West Sumatra Yosefa, Bella; Thamrin, Thamrin; Tanjung, Afrizal
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.108-113

Abstract

Coral reefs are massive piles of sediment from calcium carbonate produced by the phylum cnidaria, class Anthozoa, and order Madreporaria, with the addition of calcareous algae and other organisms that produce calcium carbonate. One group of biota that lives in association with coral reefs and plays a vital role in the coral reef ecosystem is the Chaetodontidae fish. The taking of the Chaetodontidae family as research material is because the coral fish of the Chaetodontidae family are indicator fish for coral reef health that can assess, monitor and predict the condition of coral reefs. Given the importance of the function and the existence of coral reefs. This study aimed to determine the condition of coral reef cover, analyze the abundance of reef fish in the Chaetodotidae family, and determine the relationship between coral reef cover and the abundance of reef fish in the Chaetodotidae family. This study was conducted in December 2024 in Sikuai Island, West Sumatra. This study used survey methods, such as UVC (underwater visual census) and UPT (underwater photo transect). The research location was divided into three stations in the southern part of Sikuai Island because the southern part is relatively protected from large waves during the west wind season. Station I is next to Sirandah Island, Station II is in the harbour area, and Station III is in the abandoned ship area. The analysis showed that the highest percentage of coral cover was found at Station III, namely 45.13%, and the lowest rate was found at Station I, 6.47%. The calculation of reef fish abundance showed that the highest abundance of reef fish was found at station III, namely 5000 ind / ha and the abundance of reef fish at station I was 6.47%.
Analysis of Environmental Conditions in Red-Eyed Snail Silvofishery in Buruk Bakul Village Simangunsong, Gusnar; Budijono, Budijono; Fauzi, Muhammad
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.102-107

Abstract

Buruk Bakul Village has a mangrove distribution covering approximately 168 hectares. However, coastal abrasion, which reaches an average of 4 meters per year, directly impacts biodiversity, including a decline in gastropod populations due to loss of shelter and food sources. One affected species is the red-eyed snail (Cerithidea obtusa), which plays a vital role in the food chain of coastal ecosystems. This study aims to determine the practice of silvofishery on C. obtusa and environmental quality, as well as changes in environmental quality due to silvofishery practices. Sampling technique: Sampling was done using the stratified random sampling method. The results showed that Silvofishery practices integrating mangrove conservation with red-eyed snail cultivation in Buruk Bakul Village showed varying results depending on environmental conditions. Plot 3 recorded the best growth with a length of 1.22 cm and a weight of 1.91 g, which was supported by the fine mud substrate and high organic matter content. In contrast, plot 1 showed the lowest results with a length of 0.77 cm and a weight of 0.48 g. Environmental conditions such as soil pH, temperature, and organic matter significantly influence snail growth, with soil pH and temperature as the dominant factors.
Organic Carbon Stock in Sediment of the Rehabilitated Mangrove Ecosystem in Kedabu Rapat Village, Meranti Islands Regency Cahyo, Bintang Dwi; Efriyeldi, Efriyeldi; Amin, Bintal
Journal of Coastal and Ocean Sciences Vol. 6 No. 2 (2025): 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/jocos.6.2.94-101

Abstract

Global climate change caused by increasing atmospheric CO₂ emissions threatens coastal ecosystems, including mangrove forests that function as carbon sinks. Kedabu Rapat Village in Meranti Islands Regency has implemented a mangrove rehabilitation program since 2017 to overcome coastal abrasion and restore the ecosystem. This study examines mangrove density, organic carbon stock in sediment, the relationship between density and carbon stock, and variations in carbon stock between sediment depths. The study was conducted at three stations according to the year of rehabilitation using a survey method with sediment sampling as deep as 30 cm, Organic carbon was analyzed using the LOI method. The study's results identified one mangrove species, Avicennia alba, from the Acanthaceae family, which dominated all observation stations. Vegetation density is classified as very dense, averaging 7,911 ind/ha, with the highest density at Station 1 (8,935 ind/ha). All stations' average sediment carbon stock reached 117.23 tons/ha, with the highest value at Station 3 (135.19 tons/ha) and the lowest at Station 1 (96.97 tons/ha). Statistical analysis revealed a weak correlation (r = 0.218; p > 0.05) between mangrove density and sediment carbon stock, indicating that other environmental factors, such as sedimentation and sediment input, play a more significant role. The distribution of carbon stock by depth was relatively uniform, ranging from 38.25 to 40.58 tons/ha. These results indicate that external factors are also determinants of carbon absorption rates

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