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INDONESIA
JURNAL ILMIAH PLATAX
Published by Universitas Sam Ratulangi
ISSN : 23023589     EISSN : -     DOI : -
Core Subject : Social,
Environmental Science
Mencakup Penulisan yang berhubungan dengan pelaksanaan penelitian yang dilakukan secara mandiri, atau kelompok, dan berdasarkan Ruang Lingkup Pengelolaan Wilayah Pesisir, Konservasi, Ekowisata, dan Keanekaragaman Hayati Perairan.
Arjuna Subject : -
Articles 501 Documents
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Effect of Probiotic Lactobacillus Sp. Dosage on Growth and Survival of Vannamei Shrimp (Litopenaeus vannamei) Rajak, Nurain; Hasim; Lamadi, Arafik; Alvionita, Mita
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.63182

Abstract

This study was conducted to analyze the effect of probiotic application in water media on the growth and survival of vannamei shrimp. It also aimed to determine the optimal probiotic dosage for enhancing growth and survival. The research was carried out for 45 days using a Completely Randomized Design (CRD). The treatments included different probiotic dosages: Treatment A = addition of Lactobacillus sp. at 2.0 ml/L, Treatment B = 2.5 ml/L, and Treatment C = 3.0 ml/L. Data were analyzed using ANOVA through the SPSS application. The observed parameters during the study included length growth, weight gain, and survival rate. Based on probiotic bacteria testing conducted at the Microbiology Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Negeri Gorontalo (UNG), the probiotic developed through fermentation showed bacterial growth identified as Lactobacillus, with a total colony count of 1.23 × 10⁸ CFU/ml. The results indicated that Treatment C (Lactobacillus sp. 3.0 ml/L) provided the best growth performance, with weight gain of 0.23 g and length growth of 1.02 cm. Meanwhile, the highest survival rate was found in Treatment B (Lactobacillus sp. 2.5 ml/L), at 54%. According to the ANOVA results, different probiotic dosages of Lactobacillus sp. had a significant effect on length growth but showed no significant effect on weight gain and survival of vannamei shrimp. Keywords: Vannamei shrimp, Lactobacillus sp., growth, survival rate Abstrak.  Penelitian ini dilaksanakan bertujuan untuk menganalisis pengaruh pemberian probiotik pada media air terhadap pertumbuhan dan kelangsungan hidup udang vaname. Serta menganalisis dosis terbaik pemberian probiotik terhadap pertumbuhan dan kelangsungan hidup udang vaname. Penelitian dilakukan selama 45 hari menggunakan Rancangan Acak Lengkap (RAL). Dengan pemberian dosis yang berbeda perlakuan A = Penambahan probiotik Lactobacillus sp. 2,0 ml/l, perlakuan B = Penambahan probiotik Lactobacillussp.2,5 ml/l, Perlakuan C = Penambahan probiotik Lactobacillussp.3,0 ml/l. Analisis data yang digunakan yaitu ANOVA dengan menggunakan aplikasi SPSS. Parameter yang diamati selama penelitian yaitu pertumbuhan panjang, berat, tingkat kelangsungan hidup. Berdasarkan hasil pengujian bakteri probiotik yang dilakukan di Laboratorium Mikrobiologi, Fakultas MIPA, UNG, menunjukkan adanya bakteri yang tumbuh dari probiotik yang dibuat dengan cara fermentasi, memperoleh jenis bakteri Lactobacillus dengan perhitungan total koloni yang diperoleh yaitu 1,23 × 10^8 CFU/ml. Hasil penelitian menunjukkan perlakuan C (probiotik Lactobacillus sp.3,0 ml/l) memberikan hasil pertumbuhan yang terbaik, yaitu pertumbuhan berat = 0,23 g, pertumbuhan panjang = 1,02 cm. Sedangkan tingkat kelangsungan hidup yang terbaik terdapat pada perlakuan B (probiotik Lactobacillus sp.2,5 ml/l) yaitu 54%. Berdasarkan hasil ANOVA, pemberian probiotik Lactobacillus sp. yang berbeda memberikan pengaruh berbeda nyata terhadap pertumbuhan panjang, namun tidak berbeda nyata terhadap pertumbuhan berat dan kelangsungan hidup udang vaname. Kata Kunci: Udang vaname, lactobacillus Sp, pertumbuhan, kelangsungan hidup
Analysis of the Role and Contribution of Coastal Women to Family Income in Talise Village, West Likupang District, North Minahasa Regency Tambani, Grace O.; Rangan, Jety K.; Kotambunan, Olvie Vanda
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.64656

Abstract

The purpose of this study is to identify and carefully analyze the roles of coastal women and the types of independent businesses they engage in, not only as housewives but also as family economic supporters in Talise Village, West Likupang District, and to analyze the contribution of women's income to family income. This study was conducted in Talise Village, West Likupang District. The respondents used as samples in this study were married women who owned businesses, had activities outside the home, and resided in Talise Village. The sampling method used in this study was purposive sampling, a sampling technique based on certain considerations such as population characteristics or previously known characteristics (Notoatmodjo, 2010). Some of the respondent criteria were: married, owned businesses, had activities outside the home, and resided in Talise Village. The total number of respondents was 20. This research will contribute to the achievement of UNSRAT's 2021–2025 Strategic Plan for Maritime Excellence, focusing on the research topic of Empowering and Enhancing Women's Participation and Social Inclusion in the Maritime Environment. Keywords: Women's Roles and Contributions, Family Income, Talise Village Abstrak.  Tujuan penelitian ini adalah untuk mengidentifikasi dan menganalisis dengan cermat bentuk peran perempuan pesisir serta bentuk usaha mandiri, selain sebagai ibu rumah tangga, juga sebagai penyokong perekonomian keluarga di Desa Talise, Kecamatan Likupang Barat, serta menganalisis besarnya kontribusi pendapatan perempuan terhadap pendapatan keluarga. Penelitian ini dilakukan di Desa Talise, Kecamatan Likupang Barat. Responden yang  dijadikan sampel dalam penelitian ini yaitu perempuan yang sudah menikah, punya usaha, punya aktivitas di luar rumah dan bermukim di Desa Talise. Metode pengambilan sampel yang digunakan dalam penelitian ini adalah purposive sampling, yaitu teknik pengambilan sampel yang berdasarkan suatu pertimbangan tertentu seperti sifat-sifat populasi ataupun ciri-ciri yang sudah diketahui sebelumnya (Notoatmodjo, 2010)11. Beberapa kriteria responden yaitu : sudah menikah, punya usaha, dan punya aktivitas di luar rumah serta tinggal di Desa Talise. Jumlah responden berjumlah 20 orang. Penelitian ini akan berkontribusi pada pencapaian RENSTRA UNSRAT 2021 –2025 di Bidang Unggulan Kemaritiman yang difokuskan pada topik riset Pemberdayaan dan Peningkatan Partisipasi Perempuan dan Inklusi Sosial dalam Lingkungan Kemaritiman. Kata Kunci: Peran dan Kontribusi Perempuan, Pendapatan Keluarga, Desa Talise
Analysis of the Role of Seagrass Biodiversity in Supporting the Conservation of Marine Ecosystems in the Nias Islands, North Sumatra Zebua, Nistiarni; Zebua, Ratna Dewi; Telaumbanua, Betzy V.; Laoli, Destriman; Dawolo, Januari; Zebua, Okniel
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.65990

Abstract

Seagrass ecosystems are essential components of coastal environments and play a strategic role in maintaining the stability and sustainability of marine ecosystems. This study aimed to analyze seagrass species diversity and the role of seagrass biodiversity in supporting marine ecosystem conservation in the Nias Islands, North Sumatra. The research was conducted at three locations: La’aya Village (North Nias Regency), Fodo Waters (Gunungsitoli City), and waters near Sirombu Port (West Nias Regency), using the quadrat transect method during the lowest low tide. Data analysis included density, frequency, cover, Important Value Index (IVI), and the Shannon–Wiener diversity index (H′). The results identified five seagrass species, namely Syringodium isoetifolium, Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis, and Thalassia hemprichii. Syringodium isoetifolium was the dominant species with the highest IVI across all study sites. The seagrass diversity index values ranged from 1.55 to 1.57, indicating a moderate level of diversity and a relatively stable community structure. These findings suggest that seagrass ecosystems in the Nias Islands are still functioning effectively and play a crucial role in supporting coastal stability, marine biodiversity, and as a scientific basis for sustainable marine ecosystem management and conservation. Keywords: coastal ecosystem; marine conservation; Nias Islands; seagrass biodiversity Abstrak Ekosistem lamun merupakan salah satu komponen penting ekosistem pesisir yang memiliki peranan strategis dalam menunjang keberlanjutan dan konservasi ekosistem laut. Penelitian ini bertujuan untuk menganalisis tingkat keanekaragaman jenis lamun serta peranan biodiversitas lamun dalam mendukung upaya konservasi ekosistem laut di Kepulauan Nias, Sumatera Utara. Penelitian dilaksanakan pada tiga lokasi, yaitu Perairan Desa La’aya (Kabupaten Nias Utara), Perairan Fodo (Kota Gunungsitoli), dan Perairan dekat Pelabuhan Sirombu (Kabupaten Nias Barat). Metode yang digunakan adalah metode transek kuadrat pada saat surut terendah, dengan analisis struktur komunitas meliputi kerapatan, frekuensi, penutupan, Indeks Nilai Penting (INP), serta indeks keanekaragaman Shannon–Wiener (H′). Hasil penelitian menunjukkan bahwa terdapat lima jenis lamun, yaitu Syringodium isoetifolium, Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis, dan Thalassia hemprichii. Syringodium isoetifolium merupakan spesies dominan di seluruh lokasi dengan nilai INP tertinggi. Nilai indeks keanekaragaman lamun pada ketiga lokasi berada pada kategori sedang, dengan nilai H′ berkisar antara 1,55–1,57. Kondisi ini menunjukkan bahwa struktur komunitas lamun relatif stabil dan masih mampu menjalankan fungsi ekologisnya secara optimal. Keanekaragaman lamun yang masih terjaga berperan penting dalam mendukung stabilitas ekosistem pesisir, penyediaan habitat biota laut, serta menjadi dasar ilmiah dalam perencanaan pengelolaan dan konservasi ekosistem laut di Kepulauan Nias secara berkelanjutan. Kata kunci: Kata kunci: biodiversitas lamun; ekosistem pesisir; konservasi laut; Kepulauan Nias
Spatial Analysis of Shallow Sea Benthic Habitats Based on Sentinel-2A Imagery in the Southern Waters of Manado Bay Putra Antou, Kevin; Rondonuwu, Ari B.; Rembet, Unstain N. W. J.; Modaso, Vivanda O. J.; Manu, Lusia; Kemer, Kurniati
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66137

Abstract

The southern coastal region of Manado Bay is experiencing intensive development pressure alongside increasing tourism activities and marine space utilization. These conditions have the potential to cause degradation of shallow-water benthic habitats, which play a vital ecological role. This study aims to map and analyze the spatio-temporal changes of shallow-water benthic habitats in southern Manado Bay using Sentinel-2A satellite imagery as the primary data source. Analysis was conducted using Sentinel-2A imagery from the 2017-2023 period through stages of image pre-processing, water column correction, and unsupervised classification using the K-means algorithm. Evaluation of the classification results was performed using an error matrix to obtain overall accuracy and Kappa coefficient values. The results indicate that the overall accuracy ranged from 72-78% with Kappa coefficients between 0.60-0.71. Spatio-temporal analysis indicates a significant decline in live coral cover from 41.09% to 28.17% during the 2017-2023 period, accompanied by an increase in dead coral area and sand substrates. These findings demonstrate that Sentinel-2A imagery can be effectively utilized for monitoring the dynamics of shallow-water benthic habitats at a regional scale and has the potential to support sustainable coastal zone planning and management. Keywords: Change Detection, Coastal Management, Sentinel-2A, Benthic Habitat. Abstrak. Wilayah pesisir selatan Teluk Manado mengalami tekanan pembangunan yang intensif seiring dengan meningkatnya aktivitas pariwisata dan pemanfaatan ruang laut. Kondisi ini berpotensi menyebabkan degradasi habitat bentik perairan dangkal, yang memainkan peran ekologis vital. Studi ini bertujuan untuk memetakan dan menganalisis perubahan spasial-temporal habitat bentik perairan dangkal di selatan Teluk Manado menggunakan citra satelit Sentinel-2A sebagai sumber data utama. Analisis dilakukan menggunakan citra Sentinel-2A dari periode 2017-2023 melalui tahapan pra-pemrosesan citra, koreksi kolom air, dan klasifikasi tanpa pengawasan menggunakan algoritma K-means. Evaluasi hasil klasifikasi dilakukan menggunakan matriks kesalahan untuk mendapatkan akurasi keseluruhan dan nilai koefisien Kappa. Hasil menunjukkan bahwa akurasi keseluruhan berkisar antara 72-78% dengan koefisien Kappa antara 0,60-0,71. Analisis spasial-temporal menunjukkan penurunan signifikan pada tutupan karang hidup dari 41,09% menjadi 28,17% selama periode 2017-2023, disertai dengan peningkatan luas karang mati dan substrat pasir. Temuan ini menunjukkan bahwa citra Sentinel-2A dapat dimanfaatkan secara efektif untuk memantau dinamika habitat bentik perairan dangkal pada skala regional dan berpotensi mendukung perencanaan dan pengelolaan zona pesisir yang berkelanjutan. Kata kunci: Deteksi Perubahan, Pengelolaan Pesisir, Sentinel-2A, Habitat Bentik
The length-weight relationship of the bigeye scad (Selar crumenophthalmus) captured by purseseiner from FMA 716 of North Sulawesi seawaters: A comparative study of the target species sizes on May and August 2022 Sitanggang, Effendi P.; Budiman, Johnny; Sitanggang, Dyan F. D.; Lohoo, Anneke V.; Kalalo, Flora P.
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66508

Abstract

Bigeye scad (Selar crumenophthalmus Bloch 1793) is rich source of proteins, Omega-3 fatty acids, and various important vitamins and minerals for human body, that makes the fish has an important economic value. Additionally, because of forming an important shoal on coastal seawaters, the fish is frequently captured, notably by purseseiners in an important quantity from the FMA 716 of North Sulawesi seawaters. The intensiveness captures of the fish may affect the sustainability and continuity life of the species. The research aims at analyzing some biological reproduction aspects of species based on gender and fishing season. The 400 samples, 200 tails on May and 200 tails on August 2022, have selected by a purposive random sampling from the captures. Data analisys refers to some common formulas, such as the length and weight size structure, sex and weight ratio, W-L relationship (W = aLb, W = weight, g), L = length (cmFL), a and b constants, condition factor (K), length at first capture (Lc50%). The legal size is determined by comparing the length at first capture (Lc50%) observed and at first maturity (Lm50%) reference. On May, the sample weight is 33,439 g (51.8% of 400 samples), the sex and weight ratios are 1:1.08 and 1:1.36 respectively with the conversion factor (cf) of 1.26. The average length and weight sizes are 21.62 ± 0.17 cm and 167.20 ± 5.15 g respectively, where the average weight per 1 cmFL is 7.67 ± 0.18 g. The L-W relationship follows W = 0.1492 L 3.0785 (r = 0.86) for male, W = 0.0566 L 3.8088 (r = 0.90) for female, and W = 0.0864 L 3.4940 (r = 0.91) for all, with K average of 1.60 ± 0.02 for male, 1.66 ± 0.03 for female, and 1.63 ± 0.02 for 200 samples. On August, the sample weight is 31,115 g (48.2% of 400 samples), the sex and weight ratios are 1:1.50 and 1:1.82 respectively, with cf of 1.21. The average length and weight sizes are 21.49 ± 0.16 cm and 155.58 ± 4.71 g respectively, where the average weight per 1 cmFL is 7.19 ± 0.17 g. The L-W relationship follows W = 0.1515 L 3.047 (r = 0.88) for male, W = 0.0789 L 3.5485 (r = 0.88) for female, and W = 0.0836 L 3.5023 (r = 0.90) for all samples, with K average of 1.50 ± 0.02 for male, 1.58 ± 0.03for female, and K of 1.55 ± 0.02 for 200 samples. On both fishing seasons, all captures are categorized a positive allometry (b>3) and 96.75% of captures has a legal size. All females have passed their first maturity stage. For this reason, the fishermen must consider carefully when they catch the fishes, outside of the two months. Considering the intensiveness of fishing activities to such species, it is indispensable since early for all stakeholders designing a regulation to limitate captutes by gender size and fishing seasons, for all species of high potential and economic value of high density of shoals. Key words: bigeye scad, biological reproduction aspects, FMA 716, North Sulawesi, fish conservationn
Coral and Reef Fish Biodiversity in the Waters of Bangka Island, North Sulawesi Mantiri, Rose O. S. E.; Septianto, Andarum; Ridwan, Moh.; Suputri, Putu Ayu; Podung, Thania Theresia; Kalmareuro, Vennda Uno; Sumilat, Deiske A.
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66620

Abstract

This study documents and identifies the diversity of coral reefs and reef fish species in the waters of Bangka Island, North Sulawesi, a coastal area rich in marine biodiversity and ecologically and economically important to the local community. The Underwater Visual Census (UVC) method was used through snorkeling and diving at depths of less than 18 meters at three locations (Coral Eye house reef, Tanjung Husi, and Linggua) from March 14 to April 4, 2025. Visual data were collected and identified in the Coral Eye Library. The results indicate that the coral reef ecosystem around Coral Eye is dominated by branching corals (Acropora) and stony corals (massive), which are important habitats for reef fish. The reef fish community is dominated by the families Pomacentridae and Chaetodontidae at depths of less than 20 meters. Fish were grouped into indicator fish (family Chaetodontidae with 6 species), target fish (5 families with 10 species, including Serranidae, Mullidae, Siganidae, Labridae, and Scaridae), and major groups (14 families with 34 species). This study provides strategic recommendations for maintaining and preserving coral reef ecosystems and reef fish diversity on Bangka Island. Keywords: Coral reefs; Reef fish; Bangka Island Abstrak.  Penelitian ini mendokumentasikan dan mengidentifikasi keanekaragaman terumbu karang dan spesies ikan karang di perairan Pulau Bangka, Sulawesi Utara, sebuah kawasan pesisir yang kaya akan keanekaragaman hayati laut dan penting secara ekologis serta ekonomis bagi masyarakat setempat. Menggunakan metode Underwater Visual Census (UVC) melalui snorkeling dan penyelaman pada kedalaman kurang dari 18 meter di tiga lokasi (Coral Eye house reef, Tanjung Husi, dan Linggua) dari 14 Maret hingga 4 April 2025. Data visual dikumpulkan dan diidentifikasi di Perpustakaan Coral Eye. Hasil penelitian menunjukkan bahwa ekosistem terumbu karang di sekitar Coral Eye didominasi oleh terumbu karang bercabang (Acropora) dan terumbu karang batu (massive), yang merupakan habitat penting bagi ikan karang. Komunitas ikan karang didominasi oleh famili Pomacentridae dan Chaetodontidae pada kedalaman kurang dari 20 meter. Ikan dikelompokkan menjadi ikan indikator (famili Chaetodontidae dengan 6 spesies), ikan target (5 famili dengan 10 spesies seperti Serranidae, Mullidae, Siganidae, Labridae, dan Scaridae), dan kelompok major group (14 famili dengan 34 spesies). Penelitian ini memberikan rekomendasi strategis untuk menjaga dan melestarikan ekosistem terumbu karang dan keanekaragaman ikan karang di Pulau Bangka. Kata kunci: Terumbu karang; Ikan karang; Pulau Bangka
Optimasi Berat Awal dan Kedalaman pada Vertikultur Caulerpa lentillifera Menggunakan Tali Nilon Monofilamen Ngangi, M.Si, Edwin L. A.; Wantasen, Adnan S.; Longdong, Sammy N. J.; Rembet, Unstain N.W.J.; Mudeng, Joppy D.
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66721

Abstract

This study aimed to analyze the effects of initial seed weight and cultivation depth on the growth of Caulerpa lentillifera in a vertical culture system using monofilament nylon rope as the planting medium in the coastal waters of Bahoi Village, North Minahasa. A 3×3 factorial design was applied, consisting of three initial weights (50 g, 100 g, and 150 g) and three depths (20 cm, 70 cm, and 120 cm), each with three replications. Observed parameters included absolute growth and specific growth rate (SGR) over a 28-day cultivation period. The results indicated that initial weight significantly affected growth, whereas depth had no significant effect and no interaction was detected between the two factors. The 50 g treatment produced the highest growth performance with an SGR of 1.39 ± 0.08% day⁻¹, which falls within the productivity range of tropical open-sea farming systems. These findings highlight that optimizing seed weight plays a more critical role than shallow depth variation in improving the cultivation efficiency of C. lentillifera under a monofilament nylon-based vertical culture system. Keywords: initial weight; marine aquaculture; C. lentillifera; monofilament nylon; vertical culture system. Abstrak.  Penelitian ini bertujuan menganalisis pengaruh berat awal bibit dan kedalaman pemeliharaan terhadap pertumbuhan Caulerpa lentillifera pada sistem vertikultur menggunakan tali nilon monofilamen sebagai media tanam di perairan Desa Bahoi, Minahasa Utara. Percobaan menggunakan rancangan faktorial 3×3 dengan tiga taraf berat awal (50 g, 100 g, dan 150 g) serta tiga taraf kedalaman (20 cm, 70 cm, dan 120 cm), masing-masing tiga ulangan. Parameter yang diamati meliputi pertumbuhan mutlak dan laju pertumbuhan harian (SGR) selama 28 hari. Hasil analisis menunjukkan bahwa berat awal berpengaruh signifikan terhadap pertumbuhan, sedangkan kedalaman tidak berpengaruh nyata dan tidak terdapat interaksi antara kedua faktor. Perlakuan 50 g menghasilkan pertumbuhan tertinggi dengan nilai SGR 1,39 ± 0,08% per hari. Nilai tersebut berada dalam kisaran produktivitas sistem budidaya laut terbuka tropis. Hasil penelitian ini menegaskan bahwa optimasi ukuran bibit lebih menentukan dibandingkan variasi kedalaman dangkal dalam meningkatkan efisiensi budidaya C. lentillifera pada sistem vertikultur berbasis tali nilon monofilamen. Kata kunci: berat bibit; budidaya laut; C. lentillifera; nilon monofilamen; sistem vertikal
Trade Agreements and Agribusiness Export Performance: Ppml Gravity Evidence From Indonesian Palm Oil Hs 1511 (2015–2023) Tumiwa, Johan Reineer; Tuegeh, Octavia Diana Monica; Paat, Franda Benedicta
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66808

Abstract

This study examines Indonesia’s export performance in an agribusiness product at the HS 6-digit level (HS 1511) over 2015-2023 by combining revealed competitiveness indicators and structural gravity estimation. First, we compute the Revealed Comparative Advantage (RCA) index to assess Indonesia’s export specialization relative to world trade. Second, we estimate a Poisson pseudo-maximum likelihood (PPML) gravity model with year fixed effects to identify the roles of destination market size, trade costs, and trade agreement coverage. Bilateral exports are constructed from UN Comtrade, macroeconomic controls are drawn from the World Development Indicators, bilateral distance and dyadic controls are obtained from CEPII, and trade agreement status is coded from DESTA at the dyad–year level using an in-force rule. Results indicate that Indonesia retains a strong revealed comparative advantage (RCA > 1 in all years), although the average RCA declines between early and late sub-periods. Gravity estimates show that destination market size (particularly population) positively predicts exports, while distance reduces expected export values. Importantly, in-force regional trade agreements are associated with significantly higher bilateral exports, approximately 48% larger export values, ceteris paribus, highlighting the relevance of policy-enabled market access alongside traditional gravity fundamentals. These findings emphasize the joint importance of competitiveness, trade-cost reduction, and effective utilization of trade agreements for sustaining and expanding Indonesia’s agribusiness exports. Keywords: comparative advantage, gravity model, PPML, trade agreements
Architectural and Infrastructure Intervention Priorities for Community Based Ecotourism Villages Using A 4a Moora Model: North Sulawesi, Indonesia Rompas, Leidy Magrid; Misik, Tamas
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66810

Abstract

Public programs supporting community-based ecotourism frequently face the problem of allocating limited budgets across multiple candidate villages that differ in attraction quality, service readiness, accessibility, and community capacity. This study develops a transparent decision support approach to prioritize government assistance for five community-based ecotourism villages in North Sulawesi Province, Indonesia, assessed during September to October 2025. The 4A destination framework was operationalized into 12 criteria representing Attraction, Amenity, Access, and Activity, and criterion weights were elicited through expert judgment averaging from an eight-member multistakeholder panel. The Multi Objective Optimization on the basis of Ratio Analysis method was applied to normalize the decision matrix, incorporate weights, and compute optimization scores. The resulting priority ranking was Budo (A3) with a MOORA score of 0.4036, Kakaskasen II (A4) with 0.3928, Bahoi (A1) with 0.3744, Pulisan (A2) with 0.3279, and Poopo (A5) with 0.2564. Dimension level interpretation indicates that Budo’s leading position is driven by strong amenity readiness and the most favorable access contribution, while Kakaskasen II performs strongly through activity diversity and homestay capacity but requires strengthened environmental management. Bahoi emerges as a conservation-oriented option constrained mainly by access and connectivity, whereas Pulisan and Poopo are primarily limited by minimum service readiness and travel time. A sensitivity check on the travel time weight shows stable ranks under plausible weight shifts, supporting the robustness of the prioritization. The study contributes an auditable ranking tool and criterion level development levers to guide staged, evidence-based allocation of government support for community-based ecotourism. Keywords: accessibility, community-based ecotourism, decision support system, moora, tourism village
Preliminary Study on the Reproduction of Three Rabbitfish Species (Siganidae) in Sopura Bay, Kolaka Regency : Muhammad Gazali; Sanjaya, M Din Hamdan; , Juhardin; Simanjuntak, Melati Octapian
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.64920

Abstract

This preliminary study investigated the reproductive biology of three rabbitfish species Siganus doliatus, Siganus canaliculatus, and Siganus puellus collected from Sopura Bay, Kolaka Regency, Southeast Sulawesi. A total of 351 individuals were analyzed between September and November 2025 to determine sex ratio, gonad maturity stages, gonadosomatic index (GSI), and length at first gonad maturity (Lₘ). The results showed male-biased populations in S. puellus (1.53:1) and S. doliatus (1.82:1), while S. canaliculatus exhibited a balanced sex ratio (1.01:1). Most individuals were at gonad maturity stages III–IV, indicating active gonadal development during the sampling period, with the spawning peak estimated in late October to November. The Lₘ values differed between species and sexes, suggesting adaptive reproductive strategies, where males generally matured at smaller sizes than females. The highest GSI values were recorded in S. puellus, indicating higher reproductive activity. These findings provide essential baseline data for understanding reproductive patterns and support sustainable management of rabbitfish resources in Sopura Bay

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