Jurnal Airaha

Modelling of Tidal Currents in the Paotere Port Waters, Makassar

Mon, 01 Dec 2025 00:00:00 +0000

Paotere Port in Makassar, South Sulawesi, is one of the strategic ports that support economic and transportation activities in eastern Indonesia. With the increasing volume of ship traffic and fisheries activities, an in-depth understanding of the dynamics of tidal currents in these waters is very important. This study aims to model tidal currents in the waters of Paotere Port, Makassar, South Sulawesi conducted from Januari 17^th to February 14^th 2024, with data collection for 29 days which includes measurements of water level and current velocity. The tidal data were analyzed using the Admiralty method to determine the harmonic constant, while the current modeling was done with MIKE 21 software. The results showed that the highest tide was recorded on January 25^th with a water level of 196 cm, while the lowest tide occurred on February 6th with a water level of 53 cm. The maximum current velocity was recorded at 0.031 m/s during high tide, while the lowest velocity reached 0.0009 m/s during low tide. Correlation analysis between tides and current velocity showed a significant positive relationship with a correlation coefficient value of r = 0.09195. This study provides important insights into the current dynamics in Paotere Port waters and can be used as a basis for better management of coastal resources in the area.

The Effect of Time of Artemia Administration on the Growth and Survival of Humpback Grouper Larvae (Cromileptes altivelis)

Mon, 01 Dec 2025 00:00:00 +0000

The humpback grouper (Cromileptes altivelis) is an economically significant fish with high
demand. Efforts to breed humpback grouper have been successful, but there is a problem of
high larval mortality in mass-scale larval maintenance, especially at certain ages. The purpose
of this study was to investigate the impact of Artemia administration timing on growth and
survival in Artemia treatment on Days 15 (D₁₅), 20 (D₂₀), and 25 (D₂₅). The study obtained
the highest survival rate of 10% with Artemia D₂₅ administration treatment. The highest growth
of 3.08 ± 0.11 cm was achieved with Artemia D₁₅ administration, but this was accompanied by
low survival (7.93%). The administration of Artemia D₂₅ is the ideal Artemia administration
for survival, and it is used for the maintenance of larvae aged D₂₅.

Density and Importance Value of Echinoderms in Seagrass Beds in the Intertidal Zone of Rumaat, Southeast Maluku

Rosita Silaban, Armin Armin, Anthon Daud Kilmanun, Bernita Silaban — Sun, 30 Nov 2025 00:00:00 +0000

Kelangsungan ekosistem padang lamun memiliki dampak signifikan terhadap kehidupan biota yang bergantung padanya. Biota yang terkait dengan ekosistem lamun sangat bervariasi, mencakup berbagai jenis ikan, Moluska, Krustasea, penyu, dugong, serta Echinodermata. Echinodermata memainkan peran penting dalam jejaring makanan di ekosistem lamun dan sebagai herbivora, karnivora, omnivora atau sebagai pemakan detritus. Tujuan penelitian yaitu mengetahui kerapatan relatif , kepadatan relatif, frekuensi relatif, indeks nilai penting dari lamun dan Echinodermata. Pengambilan sampel lamun menggunakan metode line transect kuadrat dengan ukuran kuadran lamun 50x50 cm dan ukuran kuadran Echinodermata 5 x 5 m. Terdapat 8 spesies lamun yaitu Enhalus acoroides, Thalassia hempricii, Halophila decipiens, Cymodocea rotundata, Cymodocea serrulata, Halodule uninervis, Halodule pinifolia dan Syringodium isoetifolium. Sementara 9 spesies Echinodermata di perairan Rumaat yaitu Holothuria atra, Holothuria edulis, Holothuria hilla, Holothuria scabra, Synapta maculata, Protoreaster nodusus, Linckia laevigata, Echinaster luzonicus dan Tripneustes gratilla. Lamun spesies Thalassia hempricii dan Enhalus acoroides dominan membentuk vegetasi yang rapat dan mampu memanfaatkan lingkungannya dengan efektif di perairan Rumaat. Echinodermata spesies Holothuria atra lebih mendominasi di perairan Rumat dan berperan penting bagi komunitasnya. Kualitas perairan Rumaat dianggap memadai bagi pertumbuhan lamun dan kelangsungan hidup Echinodermata.

Coral Reef Rehabilitation Using The Web Spider Method to Support Ecotourism in Matahora Village, Wakatobi

Sun, 30 Nov 2025 19:35:51 +0000

Terumbu karang memainkan peran ekologis yang penting; namun, ekosistem di Desa Matahora, Wakatobi, telah terdegradasi akibat tekanan antropogenik. Penelitian ini bertujuan untuk menganalisis efektivitas metode laba-laba jaring dalam merehabilitasi terumbu karang menggunakan fragmen Acropora cervicornis yang ditransplantasikan pada dua kedalaman yang berbeda: 6 meter (Stasiun 1) dan 10 meter (Stasiun 2). Penelitian dilakukan selama empat bulan, mencakup pengamatan tentang pertumbuhan fragmen karang, tingkat kelangsungan hidup, dan keberadaan ikan karang. Hasil menunjukkan tingkat kelangsungan hidup 100% dari fragmen yang ditransplantasikan, dengan pertumbuhan rata-rata yang lebih tinggi tercatat di Stasiun 1 (0,93 cm/bulan) dibandingkan dengan Stasiun 2 (0,53 cm/bulan). Selain itu, ada peningkatan keanekaragaman hayati ikan karang, dengan tujuh spesies yang diidentifikasi dikategorikan sebagai ikan target dan utama. Stasiun 1, yang ditandai dengan perairan yang lebih dangkal, menunjukkan keanekaragaman ikan yang lebih tinggi daripada Stasiun 2. Temuan ini menunjukkan bahwa metode laba-laba jaring efektif dalam mendukung rehabilitasi terumbu karang, menciptakan habitat yang meningkatkan keanekaragaman hayati ikan karang, dan memberikan potensi yang signifikan untuk pengembangan ekowisata berbasis laut berkelanjutan di Desa Matahora.

Kata kunci: Ekowisata, Pertumbuhan karang, Rehabilitasi, Laba-laba jaring

Rancang Bangun Alat Tangkap Ramah Lingkungan Untuk Keberlanjutan Ikan Endemik Pulau Tomia Wakatobi

Amir Suruwaky, Khairudin Isman, Sepri Sepri, Nurdin Kasim, Ratu Sari Mardiah — Mon, 01 Dec 2025 00:00:00 +0000

This study aims to identify and design environmentally friendly fishing gear in accordance with the regional regulations of Wakatobi Regency to support the sustainability of ole fish in Tomia Island. A descriptive qualitative approach was employed, with data collected through in-depth interviews, participatory observation, and focus group discussions (FGDs). The results of this study are expected to provide both technical and social recommendations for the development of sustainable fishing gear based on local wisdom. Data were analyzed thematically and validated through source triangulation to enhance the study’s credibility. This research contributes to the conservation of endemic fish resources and the strengthening of community-based fisheries governance.

Mutu Organoleptik Pada Variasi Produk Kulit Lumpia Isi Abon Cakalang

Mon, 01 Dec 2025 00:00:00 +0000

Skipjack tuna is one of the potential and abundant fish in North Sulawesi. Skipjack tuna floss is one of the products diversified in the processed fishery. Utilization of skipjack tuna floss to produce nutritious and acceptable fish diversification products. This study aims to determine the level of consumer acceptance using organoleptic testing of variations of spring roll skin products filled with fresh and smoked skipjack tuna floss. Variations of spring roll skin in samples 1, 2, and 4 do not use eggs while sample 3 uses eggs. In addition, variations of fillings in samples 1 and 2 use smoked skipjack tuna floss while samples 3 and 4 use fresh skipjack tuna floss which are tested organoleptically and analyzed statistically using SPSS Statistic 24. The study results showed that spring roll products were liked and accepted by panelists with values above 7. Panelists liked samples 1 and 2 because they used smoked skipjack tuna floss filling. Panelists liked spring roll skin in sample 3 because it used eggs so it had a crispy texture. The results of the statistical analysis showed that the quality of smell and taste influenced the level of panelist preference.

Direct Use Value of Coral Reef Ecosystems in the TWAL Maumere Tourism Area

Barnabas Pablo Puente Wini Bhokaleba — Mon, 01 Dec 2025 12:58:54 +0000

The Marine Nature Tourism Park (Taman Wisata Alam Laut, TWAL) of the Maumere Gulf Island Cluster is a region characterized by its hihgly potential coral reef ecosystem. However, a significant portion of the coral reefs has been degraded due to marine tourism activities and destructive practices. To mitigate further extensive damage, this study conducted an economic valuation employing the Effect on Production and Travel Cost Method approaches. The research was carried out between August and October 2024 across several locations within the TWAL area. Utilizing a survey methodology, data were collected from 37 fishers and 40 marine tourists. The findings reveal that the economic value of capture fisheries activities amounts to IDR 8,070,197,832.83 anually, while the economic value of marine tourism activities reaches IDR 12,469,160,122,602 per year. Consequently, the combined total economic value of these activities is IDR 12,477,230,320,435.

Kewords: Effect on Production, Travel Cost Method, Coral Reef Ecosystem

Variasi Morphology of the Sorong Rainbowfish Melanotaenia fredericki (Fowler, 1939) from the Salawati Population, Sorong Regency, Indonesia

Mon, 01 Dec 2025 00:00:00 +0000

Rainbowfish (Melanotaenia) is the most specious genus wthin the Melanotaeniidae, comprising 89 species inhabiting the freshwater environments occured both two landmass of Australia and New Guinea, including Indonesian Papua. In the Bird’s Head of Papua, 39 species have been recorded, one of which is Melanotaenia fredericki (Fowler, 1939), found in Sorong and Salawati Island. This study aims to examine morphological variation of the seven populations of M. Fredericki and a nominal species using multivariate (PCA) and bivariate scatterplot analyses based on 19 morphometric characters. The PCA results indicate that most characters are non-diagnostic due to overlapping among populations. However, bivariate scatterplot analysis revealed several diagnostic characters, such as eye diameter (ED), first dorsal fin length (SLSDF), pelvic fin length (PFL), and Snout length (SNL), which distinguish specific populations. Populations from Bendungan Majaran, Fasin, Kalobo, Makotyamsa, and Kurnia Sorong exhibit unique morphological traits, while Klamono and the Tentara Klamono Site show no diagnostical characteristics.

Analysis of Water Quality in Silvofishery Ponds of SUPM Waiheru Ambon in Kairatu, West Seram Regency, Maluku

Mon, 01 Dec 2025 13:17:37 +0000

Coastal and marine natural resources are increasingly under pressure due to excessive exploitation, leading to environmental damage. One alternative to overcome this is by using a silvofishery cultivation system where mangrove forests are utilized together with fisheries cultivation activities. This study aims to determine the water quality in the SUPM Waiheru Ambon Aquaculture Installation pond in Kairatu Village as a supporting medium for freshwater fish cultivation activities. The research methods used include direct measurements on site (Insitu) and laboratory analysis. Parameters measured in situ include temperature, brightness, pH, salinity, dissolved oxygen (DO), and total dissolved solids (TDS), while laboratory parameters consist of nitrate, nitrite, phosphate, and ammonia. The results of the study showed that all water quality parameters were within the range of standard quality values recommended by national regulations such as SNI 8005:2014 and PP No. 22 of 2021. The temperature obtained ranged from 29.0–31.8°C, brightness 15–35 cm, salinity 0.2–0.5 ppt, pH 7.1–7.5, DO 4.0–4.6 mg/L, TDS 300–400 mg/L, nitrate 0.26–0.64 mg/L, nitrite 0.02–0.04 mg/L, phosphate 0.03–0.06 mg/L, and ammonia 0.02–0.03 mg/L. Based on these results, it can be concluded that the water quality in the SUPM Waiheru Ambon pond is classified as good and suitable for freshwater fish farming activities.

Seakeeping Performance Analysis of A 5 GT Fishing Vessel After Hatch Modification and Main Engine Replacement (Case Study : KM. Nelayan 2017-572)

Ahmad Yasim, Meitha Soetarjo, Mahrani Mahrani — Mon, 01 Dec 2025 00:00:00 +0000

Fishing vessels may experience operational damage, as occurred with a 5 GT fishing vessel in the Lombok Strait. The vessel sustained significant damage, requiring modification of the hatch and replacement of the main engine. This incident was triggered by an accident, but the lack of information regarding the vessel's performance was a contributing factor. Therefore, a seakeeping analysis is necessary to prevent similar accidents from reoccurring. The strip theory method was applied with four variations of sea state conditions: light sea state (Hs = 1 m, Tp = 4.82 s), moderate sea state (Hs = 2 m, Tp = 6.11 s), rough sea state (Hs = 3 m, Tp = 7.69 s), and very rough sea state (Hs = 5 m, Tp = 11.63 s), using the JONSWAP spectrum and five wave directions. A comparative analysis between condition X0 (pre-modification) and X1 (post-modification) revealed no significant differences in heave and pitch motions. While roll responses were nearly identical, the roll motion in X1 occurred at a lower encounter frequency than in X0. A more detailed seakeeping performance assessment of X1 indicated that the roll and pitch motions complied with seakeeping criteria only at wave heights of 1 to 1.5 meters. Beyond this range, the vessel failed to meet operability criteria. Based on lateral and vertical acceleration thresholds, the vessel demonstrated reasonably good performance. Consequently, the vessel is recommended to operate under slight sea state conditions (Hs = 1-1.5 m).

Analysis of Water Quality Effect on the Mapping of Seagrass Cover in Buhung Pitue Island, Sinjai Regency

Mon, 01 Dec 2025 00:00:00 +0000

The condition of seagrass beds in a water body can be determined by assessing seagrass cover. Remote sensing is a method that has been widely used to map and monitor seagrass cover. Environmental factors such as sediment characteristics and water quality have a great influence on seagrass conditions. This study aims to determine the influence of water quality on seagrass cover mapping in Buhung Pitue Island, Sinjai Regency. Seagrass cover mapping uses Landsat-8 satellite images with maximum likelihood classification, while the water quality analyzed is turbidity, TSS (Total Suspended Solid) and TDS (Total Dissolve Solid). Based on the results of the study, seagrass cover was dominated by the dense seagrass category (51-75%). The turbidity analysis results were 0.25 - 1.6 nTU, TSS was 6 - 58 mg/L and TDS was 58 - 64.5 mg/L. The three results of water quality measurements do not exceed the threshold of seawater quality standards for biota according to the Decree of the Minister of Environment No. 51 of 2004, so it does not affect the mapping of seagrass cover.

Keywords: Mapping, Seagrass Cover, TDS, TSS, Turbidity

Performance Analysis of the Main Engine Lubrication System of FV. Trans Mitramas 5

Mon, 01 Dec 2025 00:00:00 +0000

The lubrication system in diesel engines is very important in ensuring engine performance, durability, and efficiency. Without an optimised lubrication system, diesel engine components can wear out quickly, the engine can easily overheat, and its performance will decrease. Eventually, this will shorten engine life and increase maintenance and repair costs. This research aims to analyse the performance of the lubrication system in the main engine, especially at the pressure and temperature. The method used is the observation method, with data collection techniques carried out by systematically observing and recording phenomena that occur at the pressure and temperature of the lubricating oil and the lubricating oil cooling water. The engine is a Hansin diesel engine with six cylinders and 2000 HP. Data was taken at 165-200 rpm. The average temperature of the lubricating oil out of the main engine is 69oC after being cooled by the oil coller, the temperature of the lubricating oil drops to 52oC, with a lubricating oil pressure of 2.1 kg/cm². The cooling process results in the lubricating oil temperature being reduced by 17oC. Lubricating oil cooling in diesel engine operations can be considered less than optimal because ideally the temperature of lubricating oil according to the manual book ranges from 37-47ºC after being cooled by seawater. From these conditions, it is necessary to maintain the lubrication system, especially the oil cooler.

Keywords: Lubricating Oil 1; Temperature 2; Pressure 3