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Pertumbuhan Rumput Laut Kappaphycus alvarezii (Doty, 1985) dengan Metode Lepas Dasar Prayudha, Muhammad Rifky; Pramesti, Rini; Susanto, AB
JURNAL ENGGANO Vol. 9 No. 2 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.9.2.208-215

Environmental factors have affected seaweed cultivation. Productivity can be increased by using the right method. Seaweed production is related to brightness and photosynthetic processes which are affected by planting depth. This study aims to examine the effect of differences in depth on the growth rate of K. alvarezii with the off-bottom cultivation method in the waters of Lontar Village, Serang Regency, Banten Province. Randomized Block Design was used as the experimental design in this study. Cultivation depth of 30 cm, 50 cm and 70 cm were used as different treatments, each with three groups and 5 replications. The growth of sample weight was observed every week for six weeks as the main parameter. Water quality (temperature, salinity, brightness, pH, current velocity, nitrate, phosphate and dissolved oxygen) was observed as another parameter. The results showed that weight growth is influenced by the depth of cultivation. The 30 cm depth has the highest growth rate with an absolute growth of 890 grams and a specific growth rate of 2.85% per day. Keywords : Kappaphycus alvarezii, depth, growth rate

Variasi Musiman Sea Level Anomaly di Wilayah Perairan Indonesia Haryo, Julis Dani; Lizalidiawati, Lizalidiawati; Irkhos, Irkhos; Suhendra, Suhendra
JURNAL ENGGANO Vol. 9 No. 2 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.9.2.200-207

Indonesia's territory is located between two vast oceans, namely the Pacific and Indian Oceans as well as the two continents of Australia and the continent of Asia. As a result, Indonesia's regional climate is directly influenced by these geographical conditions. As is known, Indonesia experiences the Northwest Monsoon and Southeast Monsoon. The seasonal variations that occur include part of the aim of this research, namely to identify seasonal variations in sea surface anomalies (SLA) in three regions of Indonesia representing western, central and eastern waters using altimetry satellite image data. The coordinates of these three areas, namely, represent parts of the West Sumatra Sea (1°S – 3°S, 95°E – 100°E), Makassar Strait (5°S- 8°S, 119°E- 25°E), and the Banda Sea (5°S – 8°S, 125°E – 109°E). The data used for 30 years (1993-2022) is in the form of monthly average SLA data and processed using Panoply software to display the SLA distribution in each area as well as the SLA Time Series in the three regions. The research results show that the highest sea level rise occurred in area A (Western waters of Sumatra) with an SLA of 1.4 m with a rate of increase ranging from 0.5-1.4 m/year. In area B (Banda Sea), the SLA obtained is 1.2 m with an increase rate ranging from 0.7-1.2 m/year. Meanwhile in Area C (Makassar Strait) it is 1.3 m with an increase rate ranging from 0.7-1.3 m/year. Keywords: Sea Surfalce Height, Season variation, west, east, and middle region.

Desain Hydrolic System With Twin Brush Kart Sebagai Sarana Penunjang Percepatan Project Ship Maintenence Angga, Anauta Lungiding A.R.; Retno, Retno Syahriawati Dewi; Sessy, Arisessy Maharani Mulananda
JURNAL ENGGANO Vol. 9 No. 2 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.9.2.216-225

ABSTRACT One of the tools that can assist in the maintenance process of a ship before it enters a dry dock is an underwater ship hull cleaner. The existing tools currently used are not yet widely available across Indonesia. Therefore, this research aims to plan the development of an underwater ship hull cleaner named the Twin Brush Kart. The objective is to determine an efficient system and design. The methodology involves collecting data on the number of shipyards and ships in Indonesia, as well as existing underwater ship hull cleaners. From the available hull cleaner data, this research adopts a hydraulic system. The hydraulic system offers advantages such as flexibility, versatility, and efficiency. The resulting design is user-friendly, with dimensions of 70 cm length, 55 cm width, and 16.7 cm height, and includes a control interface for the user. Additionally, the planned system is straightforward for users to understand, allowing for quick learning of the Twin Brush Kart. Based on the planning results, the specifications include a diesel engine with 14.55 kW of power, a hydraulic pump with a flow rate of 40.1 lpm and a working pressure of 185 bar, and a rotary actuator with a displacement of 19.9 cc and a rotational speed of 1000 RPM. Keywords: Hull, underwater cleaner, hydraulic system

Pola Pertumbuhan Kerang Lokan Geloina erosa, Solander 1786 di Muara Jenggalu Kota Bengkulu Nella Tri Agustini; Nisa Nurul Suci, An; Iresta Wardani, Firdha; Dono Wilopo, Mukti; Putri Sari , Yenni; Abdurrahman Mahfudz, Akbar
JURNAL ENGGANO Vol. 9 No. 2 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.9.2.226-233

Kerang lokan Geloina erosa merupakan salah satu kelompok Bivalvia yang hidup dan berkembang di Ekosistem Mangrove. Kerang ini telah dimanfaatkan oleh penduduk sekitar sebagai biota konsumsi dan memiliki kandungan gizi yang tinggi. Salah satu daerah penghasil kerang lokan di Kota Bengkulu adalah Muara Jenggalu, terletak di Jalan Jenggalu Kelurahan Lingkar Barat Kota Bengkulu. Permintaan masyarakat yang cenderung meningkat setiap tahun menyebabkan meningkatnya eksploitasi terhadap kerang lokan. Pemanfaatan kerang lokan dieksploitasi secara langsung di ekosistemnya yaitu ekosistem mangrove. Pengambilan kerang lokan secara terus menerus dan banyaknya aktivitas manusia di sekitar kawasan Muara Jenggalu dikhawatirkan dapat mengakibatkan terjadinya penurunan ketersediaan stok kerang lokan di ekosistem mangrove Muara Jenggalu. Penelitian ini bertujuan untuk menganalisis hubungan panjang berat dan nisbah kelamin kerang lokan di Muara Jenggalu Kota Bengkulu. Pertumbuhan kerang lokan di Muara Jenggalu bersifat allometric negative (<3) dimana pertumbuhan panjang cangkang lebih dominan daripada pertumbuhan berat. Persentase jumlah kerang lokan berjenis kelamin jantan yaitu 61,96% dan berjenis kelamin betina 38,04%.

Variasi Musiman Tinggi Gelombang Laut di Perairan Pulau Enggano Provinsi Bengkulu Chinci, Jeniu; Lizalidiawati, Lizalidiawati; Suhendra, Suhendra; Anjasman, Anjasman
JURNAL ENGGANO Vol. 9 No. 2 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.9.2.233-246

Enggano Island is one of Indonesia's outermost islands located in the waters west of Sumatra. Enggano Island is directly adjacent to the vast and deep Indian Ocean so that the waters are very dynamic. One of them is known that the sea waves in these waters are very volatile. This study aims to find out the seasonal variation of sea wave height in the waters of Enggano Island, Bengkulu Province. This study uses primary data in the form of sea wave height measured at Kaana Beach and secondary data for 3 years (2021-2023) in the form of monthly average wind direction and speed, temperature and density data obtained from https://data.marine. copernicus.eu/viewer/expert?view=layers&dataset=GLOBAL_ANALYSISFORECAST_PHY_001_024, sea wave height data obtained from https://data.marine.copernicus. eu/viewer/expert?view=layers&dataset=GLOBAL_ANALYSISFORECAST_WAV_001_027. Data processing uses Python Anaconda 3 software for 2D display and Microsoft Excel for time series display. The methods used in this study are descriptive and quantitative methods. The results of the study show that the sea wave height in the waters of Enggano Island varies seasonally, it can be seen that the maximum sea wave height occurs in the eastern season in August with a value of 1.5-3 m with a wind direction and speed of 5-6 m/s and 7 m/s in the southern area of the island, while the minimum wave height occurs in the western season in December with a value of 1-2 m with a wind direction and speed of 1-2 m/s blowing towards the North and West of the island. Keywords : Enggano Island, seasonal variation, high sea waves, wind speed

Pupulation Density Of (Tenualosa ilisha) During The Peak Spawning Season In The Down Stream Barumun River
JURNAL ENGGANO Vol. 10 No. 1 (2025)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.10.1.1-7

The aim of this study was to explore the population density of (Tenualosa. Ilisha) during its peak spawning season. This understanding is crucial for effective management and conservation of the species, which is critical to fisheries and local ecosystems. The study was conducted from January to April 2023. This period was chosen to capture data during the peak spawning season of Hilsa fish, which is critical for understanding its population dynamics. The study was conducted in the lower reaches of the Barumun River. The study site was divided into three sampling points, which were determined based on information provided by local fishermen. This strategic selection of sampling points was critical to accurately assess the population density of (T. Ilisha) in the river environment. Data analysis in this study utilised SPSS software, Pearson correlation analysis, and focused on key water quality parameters to assess their impact on (T. Ilisha) population density. The population density of (T. Ilisha) was observed to range from 0.11 to 0.14 fish per 100 m² at the station. Correlation analysis showed a strong correlation between salinity and population (0.723). This shows that salinity has the most influence on population density. Based on this it can be concluded that the density of (T.ilisha) fish populations in the lower reaches of the Barumun River is influenced by salinity.

Variabilitas Suhu di Samudera India Pada Saat Indian Ocean Dipole Positif Tahun 2006 Johan, Septi
JURNAL ENGGANO Vol. 10 No. 1 (2025)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.10.1.20-27

The Indian Ocean Dipole (IOD) is a phenomenon of ocean and atmosphere interaction characterized by differences in sea surface temperature between the eastern (90oE-110oE and 10oS-0oN) and western (50oE-70oE and 10oS-10oN) of Indian Ocean. This study examines the variability of the temperature of the Indian Ocean during the positive evolution of the Indian Ocean Dipole (IOD) in 2006. The data used in this research are Sea Surface Temperature (SST) data, wind data, monthly Sea Surface Height (SSH) data and current velocity data. zonal. These data were then analyzed using a low-pass filter with a 13-month cut-off period to observe the IOD phenomenon. The results of this study indicate that positive IOD evolution in 2006 was identified through the IOD Index, this is also supported by the results of temperature data analysis. Based on temperature data, there is a pattern of temperature differences between the eastern and western regions of the Indian Ocean. In May, the surface temperature begins to decrease, indicating the start of the IOD evolutionary phase. IOD began to occur in May with a temperature of -0.5oC. Over time, IOD evolution reaches a peak in September-October with a temperature of -1.8oC and begins to experience evolutionary decay in November-December with a temperature of -0.2oC. IOD evolution that occurs on the surface is influenced by zone currents and surface wind movements that move to the left. The positive IOD movement to the west also affects the decrease in sea level in the west coast of Sumatra which is marked by a negative value of SSHA. Keywords: Indian Ocean Dipole, Lowpass Filter, Temperature

Proyeksi Kenaikan Muka Air Laut dan Dampaknya berdasarkan skenario Shared Socioeconomic Pathways di Pulau Enggano tahun 2020-2150 Anwar, Iwan Pramesti; Suci, An Nisa Nurul; Wilopo, Mukti Dono; Atmojo, Aulia Try; Khadami, Faruq
JURNAL ENGGANO Vol. 10 No. 2 (2025)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.10.2.49-61

Global climate change is causing significant impacts across various regions of the world, one of which is the rise in sea level in Pulau Enggano. Utilizing The NASA Sea Level Projection Tool and The Coastal Risk Screening Tools, this research successfully analyzes the projections of sea level rise and coastal inundation areas in Pulau Enggano. Seven Shared Socioeconomic Pathways (SSP) scenarios for the years 2050, 2100, and 2150 are analyzed. The analysis results indicate significant risks: by 2050, the rise in sea level is expected to range from 0.05 m to 0.2 m, with inundated areas remaining limited, primarily affecting a small part of the Tanjung Laksaha nature reserve. The average rate of sea level increase during this period varies between 4 mm/year and 12 mm/year. In 2100, projections show that the inundated areas will expand, with optimistic scenarios like SSP1-1.9 estimating a rise of about 0.4 m, while pessimistic scenarios such as SSP5-8.5 could reach 0.89 m. This sea level rise indicates an increased risk of damage to infrastructure. Meanwhile, by 2150, nearly the entire northern and eastern coast of the island is expected to be submerged, with optimistic scenarios showing lower increases compared to pessimistic scenarios, which could exceed 2.5 m. These findings underscore the urgent need for adaptation and mitigation strategies to ensure the sustainability of Pulau Enggano in the future. Keywords: Sea level rise, Climate Change, inundation map, Enggano Island

Isolasi Senyawa Saponin dari Mangrove Rhizophora Mucronata dan Pemanfaatannya sebagai Pestisida Nabati Pada Larva Nyamuk Purnama, Dewi; Rizky Suryaman Simbolon; Bertoka Fajar SP Negara; Maya Anggraini Fajar Utami; Lita Astini; Firdha Iresta Wardani; Nurlaila Ervina Herliany; Anggini Fuji Astuti
JURNAL ENGGANO Vol. 10 No. 1 (2025)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.10.1.8-19

Senyawa saponin merupakan metabolit sekunder tumbuhan yang berperan dalam mekanisme pertahanan terhadap tekanan lingkungan serta memiliki potensi aplikasi sebagai antikanker, antijamur, antibakteri, dan pestisida nabati. Salah satu jenis mangrove yang diketahui mengandung saponin adalah Rhizophora mucronata. Penelitian ini bertujuan untuk mengkaji kandungan saponin pada ekstrak daun, akar, dan kulit batang R. mucronata serta mengevaluasi potensi toksisitasnya sebagai pestisida nabati terhadap larva nyamuk. Penelitian dilakukan menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan bagian tumbuhan dan tiga ulangan. Parameter yang diamati meliputi rendemen ekstrak, identifikasi saponin menggunakan uji busa, serta uji toksisitas terhadap larva nyamuk selama 24 jam pada beberapa konsentrasi ekstrak. Data uji toksisitas dianalisis menggunakan analisis ragam (ANOVA) pada tingkat kepercayaan 95%. Hasil penelitian menunjukkan bahwa saponin terdeteksi pada ekstrak daun, akar, dan kulit batang R. mucronata, namun saponin pada ekstrak daun bersifat kurang stabil. Ekstrak akar dan kulit batang menunjukkan karakteristik busa yang lebih stabil serta persentase kematian larva yang lebih tinggi dibandingkan ekstrak daun. Meskipun demikian, hasil analisis ANOVA menunjukkan bahwa pemberian berbagai ekstrak saponin dari daun, akar, dan kulit batang R. mucronata tidak memberikan pengaruh yang berbeda nyata terhadap tingkat kematian larva nyamuk. Hasil ini mengindikasikan bahwa ekstrak kulit batang dan akar R. mucronata memiliki potensi sebagai sumber saponin, namun efektivitasnya sebagai pestisida nabati masih memerlukan optimasi metode ekstraksi dan pengujian lanjutan.

Analisis Kesesuaian dan Daya Dukung Kawasan Ekowisata Pantai Kategori Rekreasi di Pantai Sekunyit Kabupaten Kaur Agustin, Nara; Johan, Yar; Dono Wilopo, Mukti
JURNAL ENGGANO Vol. 10 No. 1 (2025)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar

Beach ecotourism is an ecotourism activity conducted in coastal areas in general by utilizing coastal resources and water levels. Sekunyit Beach is one of the beaches located in South Kaur District which is directly adjacent to the Indian Ocean. South Kaur district has an area of land area reaching 92.75 km2. This study aims to analyze the carrying capacity of recreational category coastal ecotourism area in Sekunyit Beach, Kaur Regency. The method performed in this study is the survey method. The results of the research on recreational category beach ecotourism in Sekunyit Beach obtained the results of the appropriate category (S2) and very appropriate (S1) with the Ecotourism Conformity Index (IKE) of 80,86% - 85,15%. While the value of the carrying capacity of sekunyit beach area ranges from 97 - 124 (people / day). Keywords: Area support capacity, Coastal ecotourism, Regional suitability, Scenic Beauty Estimation, Sekunyit Beach

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Journal Mail Official
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Kota bengkulu,

Bengkulu

INDONESIA