Jurnal Ilmiah Platax
https://ejournal.unsrat.ac.id/v3/index.php/platax
<div class="intro" style="width: 500px;"> <p><strong>The Aquatic Resources Management Study Program, the Faculty of Fisheries and Marine Sciences, Sam Ratulangi University, publishes the Platax Scientific Journal</strong>. The Ministry of Research, Technology, and Higher Education accredits it.</p> <p><strong>Platax Scientific Journal</strong> aims to disseminate knowledge and insights from research results, innovations, and reviews on Water Resources Management.</p> <p>This journal publishes research in Coastal area management, Conservation, ecotourism, Biology, ecology, Environmental Health, marine molecular, and Marine Resources.</p> <ul> <li><strong title="p-issn gulawentah">ISSN: <a href="https://portal.issn.org/resource/ISSN/2302-3589" target="_blank" rel="noopener">2302-3589</a>(online)</strong></li> <li><strong>Accreditation Number: <a href="https://sinta.kemdikbud.go.id/journals/profile/2155" target="_blank" rel="noopener">(SINTA 4)</a></strong></li> <li><strong>URL: <a href="https://ejournal.unsrat.ac.id/v3" target="_blank" rel="noopener">E-Journal Universitas Sam Ratulangi (unsrat.ac.id)</a></strong></li> </ul> </div> <p> </p>Sam Ratulangi Universityen-USJurnal Ilmiah Platax2302-3589<p>COPYRIGHT</p> <p>Authors who publish with this journal agree to the following terms:</p> <p>Authors hold their copyright and grant this journal the privilege of first publication, with the work simultaneously licensed under a <a href="https://creativecommons.org/licenses/by-nc/4.0/">Creative Commons Attribution License</a> that permits others to impart the work with an acknowledgment of the work's origin and initial publication by this journal.</p> <p>Authors can enter into separate or additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (for example, post it to an institutional repository or publish it in a book), with an acknowledgment of its underlying publication in this journal.</p> <p>Authors are permitted and encouraged to post their work online (for example, in institutional repositories or on their website) as it can lead to productive exchanges, as well as earlier and greater citation of the published work (<a href="http://opcit.eprints.org/oacitation-biblio.html">See The Effect of Open Access</a>).</p> Isolation and Potential of Plastic-Degrading Bacteria from Plastic Waste
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/58358
<p>Plastic waste is an environmental issue, including in marine environments. One method of managing plastic waste is through biodegradation using bacteria. This study aims to isolate bacteria from plastic waste in Malalayang, and North Sulawesi waters, and test their potential to degrade plastic using laboratory experimental methods. Bacteria were isolated using a Nutrient Agar (NA) medium and then tested for their ability to degrade plastic using a Nutrient Broth (NB) medium containing plastic fragments. The NB medium with plastic fragments was incubated using an orbital shaker at room temperature with agitation at 130 rpm for 30 days. Five bacterial isolates were successfully obtained from plastic waste: isolates C1, C2, C3, C4, and C5. Four of the bacterial isolates were found to be capable of degrading plastic, as indicated by the reduction in the dry weight of the plastic after 30 days of incubation. The highest plastic weight reduction was shown in isolate C2, with a decrease of 2.95%, while the lowest reduction was observed in isolate C4, with a decrease of 2%.</p> <p><strong>Keywords</strong>: Bacteria, Isolation, Biodegradation, Plastic.</p> <p><strong>Abstrak</strong></p> <p>Sampah plastik merupakan masalah lingkungan termasuk lingkungan laut. Salah satu pengelolaan sampah plastik adalah melalui biodegradasi menggunakan bakteri. Penelitian ini bertujuan mengisolasi bakteri dari sampah plastik Perairan Malalayang, Sulawesi Utara dan melakukan uji potensi bakteri tersebut dalam mendegradasi plastik menggunakan metode eksperimen laboratorium. Bakteri diisolasi menggunakan medium <em>Nutr</em><em>ie</em><em>n</em><em>t </em><em>Agar</em> (NA), kemudian diuji kemampuan mendegradasi plastik dengan menggunakan medium <em>Nutrient Broth</em> (NB) yang berisi potongan plastik. Medium NB berisi potongan plastik diinkubasi menggunakan <em>orbital shaker</em> pada suhu ruang dengan agitasi 130 rpm selama 30 hari. Lima isolat bakteri berhasil diisolasi dari sampah plastik, yaitu isolat C<sub>1</sub>, C<sub>2</sub>, C<sub>3</sub>, C<sub>4</sub> dan C<sub>5</sub>. Didapatkan empat isolat bakteri yang mampu mendegradasi plastik, yang ditunjukkan dengan pengurangan berat kering plastik setelah diinkubasi selama 30 hari. Pengurangan berat plastik tertinggi ditunjukkan oleh isolat C<sub>2 </sub>sebesar 2,95 %, sedangkan pengurangan berat terendah oleh isolat C<sub>4</sub> sebesar 2 %.</p> <p><strong>Kata kunci</strong>: Bakteri, Isolasi, Biodegradasi, Plastik.</p>Clara FattiNatalie Detty C. RumampukGrevo Soleman GerungStenly WullurJane Marianne MamuajaElvy Like Ginting
Copyright (c) 2025 Clara Fatti, Natalie Detty C. Rumampuk, Grevo Soleman Gerung, Stenly Wullur, Jane Marianne Mamuaja, Elvy Like Ginting
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2025-01-292025-01-291311710.35800/jip.v13i1.58358Variability Of Chlorophyll-A and Sea Surface Temperature in The Maluku Sea During El Nino Period 2023
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/57199
<p>Oceanographic factors such as Sea Surface Temperature (SST) and Chlorophyll-a (Chl-a) during El Nino can make fishing easier. The research aims to analyze the variability of SST and Chl-a in the Maluku Sea during El Nino 2023 and determine the influence of El Nino on upwelling in the Maluku Sea. The method used uses SST from Remote Sensing data which has been validated using observation and Chl-a data. Rainfall data is used to ascertain the climatic conditions of the North and South Maluku Sea regions. Validation of remote sensing SST data with observations has a correlation coefficient of 0.677. The research results show that in the West Monsoon of North Maluku, the SST was 29.1ºC and Chl-a 0.24 mg/m<sup>3</sup> due to the influence of La Nina 2022 as shown by the rainfall in February of 199 mm. During the transition monsoon, the SST in the North Maluku Sea is 29.3 ºC higher than the South 29.8ºC. The East Monsoon SST in the Southern Maluku Sea experiences a decrease in temperature reaching 27.9 ºC and Chl-a of 075 mg/m<sup>3</sup>. Transition Monsoon II SST is 30ºC and Chl-a 0.21 mg/m<sup>3</sup>. The research concludes that the El Nino phenomenon that will occur in 2023 will affect upwelling in the Maluku Sea by 84%. There is a mismatch between the Chl-a peak in August SST and the SPL peak that occurred in September. When El Nino 2023 occurs, Chl-a is higher in the southern part of the Maluku Sea compared to the northern part, as is the SST.</p> <p>Keywords: SST, Chl-a, East monsoon, El Nino, Upwelling</p> <p>Abstrak</p> <p>Mengetahui faktor oseanografi seperti Suhu Permukaan Laut (SPL) dan Klorofil-a (Chl-a) saat El Nino dapat mempermudah penangkapan ikan. Tujuan penelitian untuk menganalisis variabilitas SPL dan Chl-a di Laut Maluku saat terjadi El Nino 2023 dan mengetahui pengaruh El Nino terhadap upwelling di Laut Maluku. Metode yang digunakan menggunakan data Penginderaan Jauh SPL yang telah di validasi menggunakan data obsevasi dan Chl-a. data curah hujan digunakan untuk memastikan kondisi iklim wilayah Laut Mauluku bagian Utara dan Selatan. Validasi data SPL penginderaan jauh dengan observasi memiliki korefisien korelasi sebesar 0.677. Hasil penelitian menunjukan bahwa pada Musim Barat Laut Maluku bagian Utara dengan SPL 29.1ºC dan Chl-a 0.24 mg/m<sup>3</sup> dikarenakan pengaruh La Nina 2022 yang ditunjukkan dari curah hujan bulan Februari sebesar 199 mm. Saat Musim peralihan SPL di Laut Maluku bagian Utara 29.3 ºC lebih tinggi dari bagian Selatan 29.8ºC. Musim Timur SPL di Laut Maluku bagian Selatan mengalami penurunan suhu mencapai 27.9 ºC dan Chl-a sebesar 075 mg/m<sup>3</sup>. Musim Peralihan II SPl sebesar 30ºC dan Chl-a 0.21 mg/m<sup>3</sup>. Kesempulan penelitain adalah ini Fenomena El Nino yang terjadi pada tahun 2023 mempengaruhi upwelling di laut maluku sebasar 84%. Terjadi ketidak seuaian antara puncak Chl-a bulan Agustus SPL dengan puncak SPL yang terjadi bulan September. Saat terjadi El Nino 2023 Chl-a lebih tinggi di Laut Maluku bagian Selatan jika dibandingkan bagian Utara, begitu pula dengan SPL.</p> <p><em>Kata kunci: SPL, Chl-a, Musim Timur, El Nino, Upwelling</em></p>Anindito LeksonoWilhelmina PattyLusia ManuInneke Fenny Melke RumenganJohny BudimanFrans Lumuindong
Copyright (c) 2025 Anindito Leksono, Wilhelmina Patty, Lusia Manu, Inneke Fenny Melke Rumengan, Johny Budiman, Frans Lumuindong
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2025-01-292025-01-2913181610.35800/jip.v13i1.57199Study on the Role and Contribution of Women to the Income of Fishing Families
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/60648
<p>The purpose of this research is to carefully analyze the role of women in contributing to the income of fishing families in Tambun Village, Likupang Barat District. The research will be conducted in Tambun Village, Likupang Barat District, using the Purposive Sampling research method. The criteria for the respondents are: married, have a fisherman husband, and reside in Tambun Village. The total number of respondents is 20 people. Based on the research findings, there are two roles of women in Tambun Village: Public Role and Domestic Role. Furthermore, the research shows that women residing in Tambun Village, Likupang Barat District, North Minahasa Regency, contribute 49% to the total family income. This figure indicates that the income of women as fishermen's wives has not yet become a primary source of family income. This research will contribute to achieving the UNSRAT 2021-2025 Strategic Plan in the Maritime Excellence sector, focusing on the research topic of Empowerment and Increasing Women’s Participation and Social Inclusion in the Maritime Environment.</p> <p>Keywords: Women's roles, family income, Tambun Village, tourism.</p> <p><strong>Abstrak</strong></p> <p>Tujuan penelitian ini adalah untuk menganalisis dengan cermat berapa besar peran perempuan dalam berkontribusi terhadapat pendapatan keluarga nelayan di Desa Tambun Kecamatan Likupang Barat. Lokasi penelitian akan dilaksanakan di Desa Tambun Kecamatan Likupang Barat dengan menggunakan metode penelitian <em>Purposive Sampling</em>, kriteria responden yaitu : sudah berumah tangga dan bersuamikan seorang nelayan dan tinggal di Desa Tambun. Jumlah responden berjumlah 20 orang. Berdasarkan hasil penelitian terdapat 2 Peran Perempuan didesa Tambun yaitu Peran Publik dan Peran Domestik selain itu berdasarkan penelitian terlihat bahwa perempuan yang bermukim Desa Tambun Kecamatan Likupang Barat Kabupaten Minahasa Utara berkonrtibusi sebesar 49 % terhadap total pendapatan keluarga. Nilai ini menunjukkan bahwa pendapatan perempuan sebagai isteri nelayan belum menjadi tumpuan pendapatan keluarga. 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. </p> <p>Kata kunci : Peran perempuan, pendapatan keluarga, Desa Tambun, Pariwisata<strong>.</strong></p>Grace O. TambaniChristian Ronald DienOlvie Vanda Kotambunan
Copyright (c) 2025 Grace O. Tambani, Christian Ronald Dien, Olvie Vanda Kotambunan
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2025-01-292025-01-29131172210.35800/jip.v13i1.60648Analysis of the Living Standards of Fishing Families in the Hook-and-Line Fishing Industry Based on Women's Empowerment in Tateli Village
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/60649
<p>The specific objectives of this study are: Identifying and carefully explaining the standard of living of fishing families based on women's empowerment/housewives in Tateli Dua Village, Mandolang District, Minahasa Regency. 1. The method used in this study is the census method. 2 Data Collection Techniques Data collected through two sources, namely primary data and secondary data. Primary data is data that is directly obtained through direct interviews at the research location, filling out questionnaires. 3 Data Analysis Methods Analysis of research data results is divided into two types, namely quantitative analysis and qualitative analysis. Engel Index Analysis, because the Engel index is one way to reflect the standard of living of a person or group of people. The results of the analysis using the Engel Index obtained a figure of 28.52%, this means that the total income of fishermen who own fishing rods is not much, even less than half of their income is used for food needs only. It can be concluded that the level of welfare of fishermen who own fishing rods is classified as good / high because more than half of their income for food needs, namely 71.47%, is used for non-food needs. This means that their lives in the house already have other facilities, such as having a television in addition to children who are well schooled. This is greatly supported by the role of fishermen's wives in working and being able to provide economic support for the family.</p> <p>Keywords: Standard of Living, Women's Empowerment, Hand Fishing</p> <p><strong>Abstrak</strong></p> <p>Tujuan khusus dalam penelitian ini, yaitu : Mengidentifikasikan dan menjelaskan dengan cermat taraf hidup keluarga nelayan pancing berbasis pemberdayaan wanita/ibu rumah tangga di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa. 1. Metode dalam penelitian ini dipakai metode sensus. 2 Teknik Pengumpulan Data Data yang dikumpulkan melalui dua sumber yaitu data primer dan data sekunder. Data primer adalah data yang langsung diperoleh melalui wawancara langsung di loakasi penelitian, pengisian kuisioner. 3 Metode Analisis Data Analisis data hasil penelitian dibedakan dalam dua macam, yaitu analisis kuantitatif dan analisis kualitatif. Analisis Indeks Engel, karena indeks Engel merupakan salah satu cara untuk mencerminkan taraf hidup seseorang atau sekelompok orang. Hasil analisis dengan menggunakan Indeks Engel diperoleh angka 28,52 %, ini berarti bahwa total pendapatan nelayan pemilik pancing tidak banyak bahkan tidak sampai separuh pendapatannya yang digunakan kebutuhan makanan saja. Hal ini dapat disimpulkan bahwa tingkat kesejahteraan nelayan pemilik pancing tergolong baik/tinggi karena lebih dari separuh pendapatannya kebutuhan pangan saja yaitu sebesar 71,47% digunakan untuk kebutuhan non pangan. Ini berarti kehidupan mereka di dalam rumah sudah ada fasilitas yang lain misalnya memiliki televisi disamping anak-anak yang disekolahkan dengan baik. Hal ini sangat ditunjang oleh peranan istri nelayan dalam ikut bekerja dan bisa memberikan dukungan ekonomi bagi keluarga.</p> <p><em> Kata kunci : Taraf Hidup, Pemberdayaan Wanita, Pancing Ulur</em><strong>.</strong></p>Victoria E. N. ManoppoSwenekhe S. DurandDjuwita R. R. Aling
Copyright (c) 2025 Victoria E. N. Manoppo, Swenekhe S. Durand, Djuwita R. R. Aling
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2025-01-292025-01-29131232810.35800/jip.v13i1.60649Analysis of the Empowerment Level of Smoked Fish Processors Tandipang (Dussumieria acuta)
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/60676
<p>The method used in this study is the case study method. Data were collected from two sources, namely primary data and secondary data. The population in this study consists of smoked Tandipang fish processors in Tumpaan Subdistrict. Data collection was done using the census method, where the entire population was selected as respondents, with 14 smoked Tandipang fish processors chosen as the sample. The data collected include primary and secondary data. Primary data was gathered through observations and interviews guided by a questionnaire, while the data obtained were analyzed using both quantitative and qualitative descriptive analysis. Family welfare was measured based on objective and subjective welfare. The analysis concluded that the average annual income of smoked Tandipang fish processors in Tumpaan Subdistrict is IDR 88,168,000, earned from working as fish processors and side jobs. The fishermen’s family expenditures consist of food and non-food expenses, with 85.68% of their total income spent solely on food. The empowerment level of traditional fishermen in Belang Subdistrict is still considered low from both economic and non-economic aspects. Economically, more than 50% of fishermen’s income is used to meet food needs only. From all non-economic aspects, the community of smoked Tandipang fish processors in the Tumpaan Subdistrict is also still categorized as lacking empowerment.</p> <p>Keywords: Hygienic, industry, sanitation, fiber.</p> <p><strong>Abstrak</strong></p> <p>Metode yang dipakai dalam penelitian ini adalah metode studi kasus. Data yang dikumpulkan melalui dua sumber yaitu data primer dan data sekunder. Populasi dalam penelitian ini adalah pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan. Teknik pengambilan data dilakukan dengan metode sensus<em>, </em>yaitu seluruh populasi akan diambil sebagai responden dan dipilih sebanyak 14 responden pengolah ikan tandipang asap. Data yang dikumpulkan berupa data primer dan data sekunder. Teknik pengumpulan data primer dengan observasi dan wawancara yang dipandu dengan kuesioner, sedangkan data yang diperoleh dianalisis dengan menggunakan analisis deskriptif kuantitatif dan deskriptif kualitatif. Kesejahteraan keluarga diukur berdasarkan kesejahteraan objektif dan kesejahteraan subjektif. Berdasarkan hasil analisis, disimpulkan bahwa rata-rata pendapatan keluarga pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan per tahun adalah Rp.88.168.000 yang diperoleh dari bekerja sebagai pengolah ikan dan pekerjaan sampingan. Pengeluaran keluarga nelayan terdiri dari pengeluaran untuk pangan dan non pangan, 85,68% dari total pendapatan nelayan hanya untuk memenuhi kebutuhan makanan saja. Tingkat keberdayaan nelayan tradisional di Kecamatan Belang masih termasuk rendah dilihat dari aspek ekonomi maupun non ekonomi. Secara ekonomi karena sebagian besar atau lebih dari 50% pendapatan nelayan hanya digunakan untuk memenuhi kebutuhan pangan saja. Dilihat dari semua aspek non ekonomi masyarakat pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan juga masih dikategorikan kurang berdaya</p> <p>Kata kunci: Higienis, industri, sanitasi, serat<strong>.</strong></p>Srie J. SondakhSiti SuhaeniSteelma Rantung
Copyright (c) 2025 Srie J. Sondakh, Siti Suhaeni, Steelma Rantung
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2025-01-292025-01-29131293610.35800/jip.v13i1.60676Management Strategies for Sea Cucumber (Holothuroidea) Fisheries Resources in West Likupang Sub-district
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/59365
<p>Indonesia is a tropical country with high marine biodiversity, including sea cucumber. The high demand for sea cucumber has led fishermen to catch sea cucumber regardless of the type or size suitable for harvesting. The lack of cultivation and regulations governing the protection of sea cucumbers has caused some species to be endangered. Sea cucumber species with high selling prices are increasingly difficult to find in West Likupang District. This study aims to identify strategies for managing sea cucumber fisheries sustainably and provide policy recommendations for their sustainable management in West Likupang District. This study used a survey method and then analyzed it with a SWOT analysis (strengths, weaknesses, opportunities, threats). The SWOT analysis reveals several strategies for achieving sustainable sea cucumber fisheries: legislation, conservation efforts, aquaculture development, regulated fishing, proper post-harvest handling, and educating fishermen on regulations.</p> <p><em>Keywords: Management, regulation, conservation, sea cucumber, SWOT</em></p> <p>Abstrak</p> <p>Indonesia merupakan negara tropis yang mempunyai keanekaragaman hayati laut yang tinggi, salah satunya ialah sumber daya trepang (Holothuridea). Permintaan pasar yang tinggi terhadap trepang, menyebabkan nelayan menangkap trepang tanpa mengindahkan jenis dan ukuran yang layak panen. Belum adanya budi daya dan regulasi yang mengatur perlindungan terhadap trepang menyebabkan beberapa spesies sudah terancam punah. Spesies trepang dengan harga jual yang tinggi makin sulit ditemukan terutama di Kecamatan Likupang Barat. Penelitian ini bertujuan untuk menentukan strategi pengelolaan sumber daya perikanan trepang, untuk mencapai perikanan trepang yang berkelanjutan, dan membuat rujukan atau rekomendasi kebijakan untuk pengelolaan sumber daya perikanan trepang (Holothuroidea) yang berkelanjutan secara umum Di Provinsi Sulawesi Utara, khususnya di Likupang Kabupaten Minahasa Utara. Penelitian ini menggunakan metode survei kemudian dianalisis dengan analisis SWOT (kekuatan, kelemahan, peluang, dan ancaman). Berdasarkan hasil analisis, terdapat beberapa strategi yang dapat dikembangkan untuk mencapai perikanan trepang yang berkelanjutan, yakni: regulasi berupa peraturan perundangan, upaya konservasi, pengembangan usaha budidaya, penangkapan yang terukur, penanganan pasca panen/penangkapan dari alam, dan sosialisasi kepada nelayan terkait peraturan</p> <p><em>Kata kunci: Pengelolaan, regulasi, konservasi, trepang, SWOT</em></p>Vania KudatoHariyani SambaliReni L. KreckhoffIndra R. N. SalindehoSwenekhe S. DurandSipriana S. TumembouwDeiske A. Sumilat
Copyright (c) 2025 Vania Kudato, Hariyani Sambali, Reni L. Kreckhoff, Indra R. N. Salindeho, Swenekhe S. Durand, Sipriana S. Tumembouw, Deiske A. Sumilat
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2025-01-292025-01-29131374410.35800/jip.v13i1.59365 Comcot 1.7 Modeling To Estimate The Maximum Height And Arrival Time Of The Tsunami In Tombariri Sub-District
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/57487
<p>Tombariri Sub-District is located on the North Coast of the Minahasa Peninsula, directly opposite the North Sulawesi Subduction. North Sulawesi subduction has the potential for earthquakes with a targeted magnitude of M8.5 that can generate tsunamis. In addition, Tombariri Sub-District has a fairly large population density and is located on the coast. This causes the Tombariri Sub-District to be highly vulnerable to tsunami hazards. This study aims to determine the tsunami's estimated maximum height and arrival time. The modeling method in this study is through the Comcot 1.7 application with the worst-case scenario of North Sulawesi Subduction M8.5. The results of this study showed that the maximum height of the tsunami reached 6.17 m. The estimated time of tsunami arrival in Tombariri District ranges from 5-10 minutes. The results of this study can be used as a means of mitigating tsunami disasters.</p> <p>Keywords: Comcot, Tsunami Modeling, Inundation, Numeric Simulation</p> <p><strong>Abstrak</strong></p> <p>Kecamatan Tombariri terletak di wilayah Pesisir Utara Semenanjung Minahasa yang berhadapan langsung dengan Subduksi Sulawesi Utara. Subduksi Sulawesi Utara memiliki potensi gempabumi dengan magnitudo tertarget M8.5 yang dapat membangkitkan tsunami. Selain itu, Kecamatan Tombariri memiliki kepadatan penduduk yang cukup besar dan berada di wilayah pesisir. Hal ini menyebabkan Kecamatan Tombariri memiliki tingkat kerawanan terhadap bahaya tsunami yang tinggi. Penelitian ini bertujuan untuk mengetahui estimasi ketinggian maksimum dan waktu tiba tsunami. Metode pemodelan dalam penelitian ini melalui aplikasi Comcot 1.7 dengan skenario terburuk Subduksi Sulawesi Utara M8,5. Hasil dari penelitian ini menunukkan bahwa tinggi maksimum tsunami mencapai 6,17 m. Estimasi waktu tiba tsunami di Kecamatan tombariri berkisar antara 5 - 10 menit. Hasil dari penelitian ini dapat digunakan sebagai sarana mitigasi bencana tsunami.</p> <p>Kata Kunci : Comcot, Pemodelan tsunami, Simulasi Numerik.</p>Abu BakriPing Astony AngmalisangKurniati KemerWilhelmina PattyRevols Dolfi CH PamikiranNurmeilita Taher
Copyright (c) 2025 Abu Bakri, Ping Astony Angmalisang, Kurniati Kemer, Wilhelmina Patty, Revols Dolfi CH Pamikiran, Nurmeilita Taher
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2025-01-292025-01-29131454910.35800/jip.v13i1.57487Community Structure of Macroalgae in the Coastal Waters of Tiwoho Village, Wori District, North Minahasa Regency
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/60693
<p>The purpose of this study is to describe the morphology and anatomy of each macroalgae species and to analyze the community structure of macroalgae from the study location. Data collection was carried out using the Line Transect method with quadrat sampling techniques conducted at the lowest tide. Temperature measurement was done using a thermometer and salinity using a refractometer, while substrate determination was visually assessed based on the type of substrate. The results of this study found 7 species, consisting of 1 species of red algae, 4 species of brown algae, and 2 species of green algae. The morphology of these algae types varies with different anatomies based on cross and longitudinal sections of each part of the algal thallus. The highest species density was Turbinaria ornata (transect 1), while the lowest density was Halimeda opuntia and Sargassum polycystum (transect 1), Turbinaria ornata (transect 2 and transect 3). The macroalgae diversity index values on the three transects were in the medium category. The species evenness index values on the three transects were stable. The species richness index values on the three transects were in the low category. The dominance index values on the three transects were in the low category.</p> <p><strong> </strong>Keywords: Macroalgae, Community, Transect, Quadrat, Tiwoho.</p> <p> </p> <p><strong>Abstrak</strong></p> <p>Tujuan penelitian ini adalah mendeskripsikan morfologi dan anatomi masing-masing spesies makroalga, dan menganalisis stuktur komunitas makroalga dari lokasi penelitian. Pengambilan data menggunakan metode <em>Line Transect</em> dengan teknik sampling kuadrat yang dilakukan pada saat surut terendah. Pengukuran suhu menggunakan Termometer dan salinitas menggunakan Refraktometer, dan untuk penentuan substrat dilihat secara visual jenis dari substrat tersebut. Hasil penelitian ini ditemukan 7 spesies yang terdiri dari 1 spesies alga merah, 4 spesies alga coklat dan 2 spesies alga hijau. Morfologi jenis-jenis alga tersebut beragam dengan anatomi yang berbeda berdasarkan potongan melintang dan memanjang dari masing-masing bagian thallus alga. Kepadatan spesies tertinggi yaitu <em>Turbinaria ornata </em>(transek 1) sedangkan kepadatan terendah yaitu <em>Halimeda opuntia </em>dan <em>Sargassum polycystum</em> (transek 1), <em>Turbinaria ornata </em>(transek 2 dan transek 3). Nilai indeks keanekaragaman makroalga pada ketiga transek termasuk dalam kategori sedang. Nilai indeks kemerataan jenis pada ketiga transek termasuk dalam keadaan stabil. Nilai indeks kekayaan jenis pada ketiga transek termasuk dalam kategori rendah. Nilai indeks dominasi pada ketiga transek termasuk dalam kategori rendah.</p> <p>Kata kunci: Makroalga, Komunitas, Transek, Kuadrat, Tiwoho.</p>Jonathan Yohanes IyanlebaRene Ch. KepelJohn Leonard TombokanKhristin F. I. KondoyStephanus Vianny MandagiAlex D. Kambey
Copyright (c) 2025 Jonathan Yohanes Iyanleba, Rene Ch. Kepel, John Leonard Tombokan, Kristen F. I. Kondoy, Stephanus Vianny Mandagi, Alex D. KAMBEY
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2025-01-292025-01-29131505710.35800/jip.v13i1.60693Study of Scleractinian Coral Recruitment in the Waters of Tanjung Pisok and Siladen Island, Bunaken National Park
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/58540
<p>The research aimed to determine the recruitment density value of scleractinian coral juveniles in Tanjung Pisok (Meras and Bahowo) and Siladen Island. The method for selecting observation locations uses purposive sampling and collecting coral juvenile recruitment data using underwater photo transects. The results of this research obtained data on genus, size, and density values for coral juvenile recruitment. The coral genera found at Station I were 19 genera with the largest number being the Porites genus, 32 colonies, Station II 13 genera with the largest number being the Favites genus, 32 colonies, and at Station III 17 genera with the largest number being the Porites genus, 32 colonies. Coral juveniles in this study were more dominant in the 2 cm - 2.9 cm size group, for Station I 63 colonies, Station II 54 colonies and Station III 32 colonies. Based on the results of this research, it shows that the coral recruitment density at Station I with a value of 12.38 colonies/m² is higher than Station II, the coral recruitment density at Station II with a value of 12.23 colonies/m² is higher than Station III with a value of 7.21 colonies/m².</p> <p><strong><em>Keywords</em></strong><strong>: </strong>Recruitment; Scleractinia; Underwater Photo Transect; Bunaken National Park</p> <p><strong>Abstrak</strong></p> <p>Tujuan penelitian menentukan nilai densitas rekrutmen juvenil karang scleractinia di perairan Tanjung Pisok (Meras dan Bahowo) dan pulau Siladen. Metode pemilihan lokasi pengamatan menggunakan <em>purposive sampling</em> dan metode pengumpulan data rekrutmen juvenil karang menggunakan <em>underwater photo transect</em>. Hasil penelitian ini memperoleh data genus, ukuran dan nilai densitas rekrutmen juvenil karang. Genus karang yang didapat di Stasiun I yaitu 19 genus dengan yang terbanyak genus <em>Porites</em> 32 koloni, Stasiun II 13 genus dengan yang terbanyak genus <em>Favites</em> 32 koloni, dan Stasiun III 17 genus dengan yang terbanyak genus <em>Porites</em> 32 koloni. Juvenil karang dalam penelitian ini lebih dominan pada kelompok ukuran 2 cm - 2.9 cm, untuk Stasiun I 63 koloni, Stasiun II 54 koloni dan Stasiun III 32 koloni. Berdasarkan hasil penelitian ini menunjukkan densitas rekrutmen karang di Stasiun I dengan nilai 12,38 koloni/m² lebih tinggi dari Stasiun II, densitas rekrutmen karang di Stasiun II dengan nilai 12,23 koloni/m² lebih tinggi dari Stasiun III dengan nilai 7,21 koloni/m².</p> <p><strong><em>Kata kunci</em>: </strong>Rekrutmen; Scleractinia; Taman Nasional Bunaken; <em>Underwater Photo Transect</em></p>Maria Magdalena LenakKakaskasen RoeroeCarolus ParuntuRemy MangindaanIndri ManembuJoice Rimper
Copyright (c) 2025 Maria Magdalena Lenak, Kakaskasen Roeroe, Carolus Paruntu, Remy Mangindaan, Indri Manembu, Joice Rimper
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2025-01-292025-01-29131586510.35800/jip.v13i1.58540Indicator Species and Diversity in Mangroves at Darunu Mangrove Park
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/59128
<p>Mangrove ecosystems play a crucial role in maintaining the ecological balance of coastal areas, including protection against abrasion, providing habitat for marine species, and acting as a carbon sink. This study aims to identify indicator species and analyze biodiversity in Darunu Mangrove Park, Darunu Village, Wori Subdistrict, North Minahasa Regency. The research was conducted over three months (May–July 2024) using a line transect method for vegetation data collection. The results show that three dominant mangrove species were identified: <em>Rhizophora apiculata</em>, <em>Rhizophora mucronata</em>, and <em>Sonneratia alba</em>. <em>R. mucronata</em> exhibited significant dominance, both in terms of mature trees and saplings, and had the highest Important Value Index (IVI). The mangrove species diversity in this area is classified as low, with the. Diversity Index (H’) indicates an imbalance in the ecosystem's species composition. The Dominance Index (C) and Evenness Index (E) analyses indicate strong dominance by certain species, particularly <em>R. mucronata</em>. This study recommends the importance of enhanced monitoring and more intensive conservation efforts, including the replanting of threatened mangrove species and raising community awareness of mangrove ecosystem conservation.</p> <p><strong><em>Keywords: </em></strong>Darunu Mangrove Park, Diversity, Indicator Species, Important Value Index.</p> <p> </p> <p><strong>Abstrak</strong></p> <p> </p> <p>Ekosistem mangrove memiliki peran penting dalam menjaga keseimbangan ekologi pesisir, meliputi perlindungan terhadap abrasi, penyedia habitat bagi spesies laut, dan sebagai penyerap karbon. Penelitian ini bertujuan untuk mengidentifikasi spesies indikator dan menganalisis keanekaragaman hayati di <em>Darunu Mangrove Park</em>, Desa Darunu, Kecamatan Wori, Kabupaten Minahasa Utara. Penelitian dilaksanakan selama tiga bulan (Mei-Juli 2024) dengan menggunakan metode transek garis untuk pengambilan data vegetasi. Hasil penelitian menunjukkan bahwa terdapat tiga jenis mangrove dominan, yaitu <em>R. apiculata, R. mucronata,</em> dan <em>S. alba</em>. Jenis <em>R. mucronata</em> menunjukkan dominasi yang signifikan, baik pada tingkat pohon maupun pancang, serta memiliki nilai Indeks Nilai Penting (INP) tertinggi. Keanekaragaman jenis mangrove di kawasan ini tergolong rendah dengan Indeks Keanekaragaman (H’) menunjukkan ketidakseimbangan spesies dalam ekosistem. Analisis Indeks Dominansi (C) dan Indeks Kemerataan (E) mengindikasikan adanya dominasi yang kuat dari beberapa spesies tertentu, terutama <em>R. mucronata</em>. Penelitian ini merekomendasikan pentingnya pemantauan dan upaya konservasi yang lebih intensif, termasuk penanaman kembali spesies mangrove yang terancam dan peningkatan kesadaran masyarakat terhadap pelestarian ekosistem mangrove.</p> <p><strong><em>Kata kunci</em></strong><em>:</em> <em>Darunu Mangrove Park</em>, Indeks Nilai Penting, Keanekaragaman, Spesies indicator</p>Maudy Rusmini MahmudAntonius RumenganCarolus Paulus ParuntuJoshian Nicolas William SchaduwNatalie Detty C. RumampukVeibe Warouw
Copyright (c) 2025 Maudy Rusmini Mahmud; Antonius Rumengan; Carolus Paulus Paruntu, Joshian Nicolas William Schaduw, Natalie Detty C. Rumampuk, Veibe Warouw
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2025-01-292025-01-29131667410.35800/jip.v13i1.59128Blister Pearl Formation in Abalone, Haliotis varia Using Anestesia
https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/60568
<p>Abalone pearl farming has significant potential to improve the livelihoods of coastal communities. This study aimed to measure early pearl blister layer thickness and analyze mortality in <em>Haliotis varia</em> following nucleus insertion. A four-month experimental study was conducted in Pulisan, North Sulawesi, Indonesia. Forty abalones underwent nucleus insertion using quick-drying adhesive after being anesthetized with benzocaine (1200 mg/L). Samples were collected monthly for two months to measure pearl layer thickness. Results showed that the average pearl layer thickness increased from 0.093 mm in the first month to 0.145 mm in the second month. However, mortality was highest in the treatment group (30%), followed by the control group with anesthesia (20%), and the control group without treatment (5%). This study concludes that pearl formation in <em>H. varia</em> is continuous but that insertion and anesthesia procedures stress individuals. These findings provide a foundation for developing more efficient and sustainable abalone pearl farming techniques.</p> <p><em>Keywords: Pearl, Pearl Production, Abalone, Haliotis varia, Anestesia</em>.</p> <p><strong>Abstrak</strong></p> <p>Produksi mutiara abalone memiliki potensi besar untuk meningkatkan kesejahteraan masyarakat pesisir. Penelitian ini bertujuan untuk mengukur pertumbuhan awal lapisan mutiara blister dan menganalisis mortalitas pada abalone <em>Haliotis varia</em> setelah proses insersi inti mutiara. Penelitian eksperimental ini dilakukan selama 4 bulan di perairan Pulisan, Sulawesi Utara. Sebanyak 40 individu abalone diinsersi inti mutiara menggunakan lem cepat kering setelah dibius dengan benzocaine (1200 mg/L). Sampel diambil setiap bulan selama dua bulan untuk mengukur ketebalan lapisan mutiara yang terbentuk. Hasil penelitian menunjukkan bahwa rata-rata ketebalan lapisan mutiara meningkat dari 0,093 mm pada bulan pertama menjadi 0,145 mm pada bulan kedua. Namun, mortalitas tertinggi (30%) terjadi pada kelompok perlakuan insersi, diikuti oleh kelompok kontrol dengan perlakuan anestesi (20%) dan kelompok kontrol tanpa perlakuan (5%). Studi ini menyimpulkan bahwa proses pembentukan mutiara pada <em>H. varia</em> berlangsung terus-menerus, namun prosedur insersi dan anestesi memberikan tekanan pada individu abalone. Penelitian ini memberikan dasar penting untuk pengembangan teknik produksi mutiara abalone yang lebih efisien dan berkelanjutan.</p> <p><em>Kata kunci: Mutiara, Produksi Mutiara, Abalone, Haliotis varia, Anestesi.</em></p>Puji Eli Arnita GuloNoldy Gustaf Frans MamangkeyMedy OmpiIndri Shelovita Manembu ManembuNickson J. KawungElvy Like GintingEsther D. Angkouw
Copyright (c) 2025 Puji Eli Arnita Gulo, Noldy Gustaf Frans Mamangkey, Medy Ompi, Indri Shelovita Manembu Manembu, Nickson J. Kawung, Elvy Like Ginting, Esther D. Angkouw
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2025-02-202025-02-20131758110.35800/jip.v13i1.60568