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All Journal JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS JOURNAL OF COASTAL DEVELOPMENT Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati ZOO INDONESIA Bawal : Widya Riset Perikanan Tangkap Zoo Indonesia Devotion: Journal of Research and Community Service Indonesian Journal of Mollusk EKOTON
Medy Ompi
Faculty Of Fisheries And Marine Science, Sam Ratulangi University, Manado, 95115, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Environmental Science Other

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Mangrove Community Structure in West Madapolo Village, North Obi District, South Halmahera Regency Ode Mantra, Syahrun; Schaduw, Joshian N. W.; Sondak, Calvyn F.A.; Ompi, Medy; Manembu, Indri S.; Wullur, Stenly
Jurnal Ilmiah Platax Vol. 11 No. 2 (2023): ISSUE JULY-DECEMBER 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i2.49712

Abstract

The ecological function of mangroves can be viewed from three aspects, namely physical, chemical, and biological aspects. Data collection of mangrove community structure using line transect quadrant method by pulling the line along 100 m from the sea to land at the lowest tide. The results of mangrove community structure analysis in West Madapolo Village, North Obi District, South Halmahera Regency. Identified 4 types of mangroves namely Rhizopora apiculata, Sonneratia alba, Brugueira gymnorhiza, and Lumnitzera litorea found at the 3 stations. The highest species density value is Rhizopora apiculata, at station 1. The highest frequency by Rhizopora apiculata, and Brugueira gymnorhiza species at station 1 with the same value of 39.29. The highest cover by Rhizopora apiculata species at station 1 with a value of 49.73 and the lowest by S. alba species at 14.17 while the highest importance value index by Rhizopora apiculata species at 147.99 and the lowest is Sonneratia alba 40.54. The highest diversity at station 2, and the lowest at station 1, the highest diversity at station 2 while the highest dominance is found at the station and the lowest at station 2. Keywords: Structure Community, Mangrove, Village Madapolo Barat Abstrak Fungsi ekologis mangrove dapat ditinjau dari tiga aspek, yakni aspek fisika, kimia dan biologi. Pengambilan data struktur komunitas mangrove menggunakan metode line transek kuadran dengan cara menarik line garis sepanjang 100 m dari arah laut ke darat pada saat surut terendah. Hasil analislis struktur komunitas mangrove di Desa Madapolo Barat, Kecamatan Obi Utara, Kabupaten Halmahera Selatan. Teridentifikasi 4 jenis mangrove yaitu Rhizopora apiculata, Sonneratia alba, Brugueira gymnorhiza, dan Lumnitzera litorea yang ditemukan pada ke 3 stasiun. Nilai kerapatan jenis tertinggi adalah Rhizopora apiculata, pada stasiun 1. Frekuensi tertinggi oleh jenis Rhizopora apiculata, dan Brugueira gymnorhiza pada stasiun 1 dengan nilai yang sama yaitu 39,29. Penutupan tertinggi oleh jenis Rhizopora apiculata pada stasiun 1 dengan nilai 49,73 dan yang terendah oleh jenis S. alba  14,17 sedangkan indeks nilai penting tertinggi oleh jenis Rhizopora apiculata 147,99 dan terendah yaitu Sonneratia alba 40,54. Keanekaragaman tertinggi pada stasiun 2, dan terendah pada stasiun 1, kseseragaman tertinggi pada stasiun 2 sedangkan dominasi tertinggi terdapat pada stasiun dan yang terendah pada stasiun 2. Kata kunci: Struktur Komunitas, Mangrove, Desa Madapolo Barat
The Suitability Index of Mangrove Tourism in the Coastal Area around Budo Village, Wori Sub-District, North Minahasa Regency for Marine Ecotourism Tambunan, Rose Agustin; Rumengan, Antonius Petrus; Paruntu, Carolus Paulus; Rampengan, Royke M.; Ompi, Medy; Rompas, Rizald Max
Jurnal Ilmiah Platax Vol. 11 No. 2 (2023): ISSUE JULY-DECEMBER 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i2.50039

Abstract

The purpose of this study was to analyze the tourism suitability index and the carrying capacity of the mangrove ecotourism area in Budo Village, Wori District, North Minahasa Regency. The research method used was a cruising survey method using line transects and visual method which were carried out on three transects to obtain mangrove bio-ecological parameter values, namely thickness, species, density, biota objects associated with mangroves, and sea tides. The results showed that the mangrove thickness values ​​on transects 1-3 were 157 m, 138 m, and 135 m respectively, with an average value of 143.3 m; a number of mangrove species, namely 6 species (Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorrhiza, Sonneratia alba, Avicennia marina, and Nypa fruticans); mangrove density values ​​on transects 1-3, respectively 10.2 ind/100 m2, 11.8 ind/100 m2 and 6.2 ind/100 m2, with an average value of 9.4 ind/100 m2; mangrove association biota objects in transects 1-3, including fishes, shrimps, crabs, mollusks, birds and reptiles; and the average tidal value is as high as 2 m. The average value of the tourism suitability index was 54.6% with the conditionally appropriate category on all transects; and the carrying capacity of the mangrove tourism area was 116 people/day, with an operational time of 14 hours/day. Further research requires a sustainability analysis to produce efficient and effective programs for the development of mangrove ecotourism in Budo Village. Keywords: Area carrying capacity, Budo Village, Ecotourism, Tourism suitability index, Mangrove Abstrak Tujuan dari penelitian ini untuk menganalisis indeks kesesuaian wisata dan daya dukung kawasan ekowisata mangrove Desa Budo, Kecamatan Wori, Kabupaten Minahasa Utara.  Metode penelitian yang digunakan adalah metode survei jelajah dengan menggunakan line transect dan metode visual pada tiga transek untuk memperoleh nilai-nilai parameter bio-ekologi mangrove, yaitu ketebalan, jenis, kerapatan jenis, objek biota asosiasi mangrove, dan pasang surut air laut. Hasil penelitian menunjukan bahwa nilai ketebalan mangrove pada transek 1-3, masing-masing adalah 157 m, 138 m, dan 135 m, dengan nilai rata-ratanya 143,3 m; jumlah jenis mangrove 6 spesies (Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorrhiza, Sonneratia alba, Avicennia marina dan Nypa fruticans); nilai kerapatan mangrove pada transek 1-3, masing-masing adalah 10,2 ind/100 m2, 11,8 ind/100 m2 dan 6,2 ind/100 m2, dengan nilai rata-ratanya 9,4 ind/100 m2; objek biota asosiasi mangrove pada  transek 1-3 meliputi ikan, udang, kepiting, moluska, burung, dan reptil; dan nilai rata-rata pasang surut air laut setinggi 2 m;  nilai rata-rata Indeks kesesuaian wisata sebesar 54,6 % dengan kategori “sesuai bersyarat” pada semua transek; dan daya dukung kawasan wisata mangrove Desa Budo adalah 116 orang/hari dengan waktu operasional 14 jam/hari. Penelitian selanjutnya diperlukan analisis keberlanjutan untuk menghasilkan program-program yang efisien dan efektif dalam rangka pengembangan ekowisata mangrove Desa Budo. Kata kunci: Daya dukung kawasan, Desa Budo, Ekowisata, Indeks kesesuaian wisata, Mangrove
Gastropods in tidal of Bulo, Mandolang District, North Sulawesi Azzahra Aulina; Ompi, Medy; Kaligis, Erly Yosef; Rumampuk, Natalie Detty C; Rimper, Joice Rinefi T.S.L; Gerung, Grevo S.
Jurnal Ilmiah Platax Vol. 12 No. 1 (2024): ISSUE JANUARY-JUNE 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i1.51083

Abstract

A tidal area is a part of the coast that is influenced by the rise and fall of the tides. The area is a dynamic area, which experiences exposure to the air when low tide comes, easily mixed with fresh water in the rainy season and inundation. Marine flora and fauna that live in the area can adapt to it. The purpose of this study was to identify gastropod species and the density of each species that were found attached to the hard substratum in the tidal area of Bulo, Mandolang District, North Sulawesi. Data were collected by line transect and squared methods. Gastropod samples obtained were treated by using 70% alcohol. The length of each species was measured before being identified at the species level. The results show 175 individuals consisting of 30 species from 14 families were recorded. Substrat of rock and dead coral were covered and dominated the intertidal bottom. The highest density of Gastropods in the tidal area of Bulo, Mandolang District, North Sulawesi was the species of Cellana radiata. The density of Cellana radiata was 3.8 ind./m², while for the other 20 species of gastropods, each species was 0.07 ind./m². Physical and biological factors that affected the presence and density of gastropod species are discussed. Keywords: Gastropods; Density; Tidal; Mollusc; Bulo Village. Abstrak Daerah pasang surut adalah salah satu daera di pesisir yang dipengaruhi oleh air pasang tinggi dan rendah. Daerah ini adalah sebagai daerah yang dinamamis, di mana adalah daerah yang terekspos dengan sinar matahari pada saat pasang rendah, mudah bercampur dengan air tawar di saat musium hujan, serta daerah yang mudah dijangkau oleh masyarakat pensisir. Biota yang hidup di daerah ini memiliki kemampuan beradaptasi dengan perubahan-perubahan lingkungan ini. Tujuan penelitian ini adalah mengidentifikasi jenis-jenis Gastropoda dan mengetahui kepadatan jenis-jenis Gastropoda, yang menempati substrat keras di daerah pasang surut Bulo Kecamatan Mandolang, Sulawesi Utara. Pengumpulan data adalah dengan menggunakan metode ‘line transect’ dan kuadrat. Sampel Gastropoda yang didapatkan diberi alkohol 70%, Panjang masing-masing spesies diukur sebelum diidentifikasi pada tingkat spesies. Hasil penelitian menunjukkan bahwa ada 175 individu yang terdiri dari 30 spesies dari 14 famili. Kepadatan tertinggi Gastropoda di daerah pasang surut Bulo Kecamatan Mandolang, Sulawesi Utara adalah Cellana radiata yang memiliki kepadatan 3.8 ind./m2, sedangkan 20 jenis Gastropoda lainnya memiliki kepadatan untuk setiap jenis, yaitu 0.07 ind./m2. Kata kunci: Gastropoda; Kepadatan; Pasang Surut; Moluska; Desa Bulo.
Attachment Of Macrobenthos Larvae To Organic And Non-Organic Substrates Saragih, Hans S. R. P.; Ompi, Medy; Kaligis, Erly Yosef; Boneka, Farnis B. Boneka; Warouw, Veibe; Paransa, Darus Sa’adah Johanis
Jurnal Ilmiah Platax Vol. 12 No. 1 (2024): ISSUE JANUARY-JUNE 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i1.52205

Abstract

The objectives of this study are 1) to Identify the specimen of macrobenthos attached to the substrate provided in 2 locations. 2) to determine the type of substrate attached by the larvae at both sites.  3) to determine the density of Macrobenthos attached to the substrate provided at 2 sites. A plywood plate had 16 holes with a diameter of 1 cm each that had been randomly filled with organic substrates, namely coconut fibers, palm fibers, shells with 'bysus' threads, and non-organic substrates in the form of plastic ropes. Each substrate has four replicates.  The plywood plate with 3 replicates was placed in each station.  The plate was removed and taken to the laboratory after 1 month. The identification up to family, genus, and species as well as the density of each species were applied.  The results showed that not only the larvae of Septifer bilocularis attached to organic and non-organic substrates, but six species of larvae were also identified. The sizes of new settler macrobenthos from 2 mm to 1 cm attached on organic and non-organic substrates were identified. The density of new settlers species attached to substrates varied from 0.03 – 0.5 individuals/cm2.  The new settlers identified 7 species in Tiwoho and 3 species in Malalayang.    Keywords: Settlement, Substrate, Tiwoho Coast, Malalayang Coas. Abstrak Tujuan dari penelitian ini adalah 1) Mengidentifikasi jenis-jenis  makrobenthos yang menempel pada substrat yang disediakan di 2 lokasi. 2) Mengidentifikasi jenis substrat sebagai tempat penempelan larva macrobenthos di  kedua lokasi, dan 3) Menentukan kepadatan jenis Makrobenthos  pada substrat yang disediakan di 2 lokasi. Triplek (plate) memiliki 16 lubang dengan ukuran diameter masing-masing 1 cm yang telah diisi secara acak dengan substrat organik yaitu serabut kelapa, serabut ijuk, cangkang ber ‘byssus’, serta substrat non organik berupa tali plastik. Masing-masing substrat ini memiliki 4 ulangan.  Selanjutnya, plate, masing-masing dengan 3 ulangan ditempatkan di setiap intertidal, Towoho dan Malalayang.  Plate diangkat setelah 1 bulan, yang dibawah ke laboratorium untuk foto dan diidentifikasi baik di tingkat jenis, genus, ataupun family.  Hasil penelitian menunjukkan bahwa tidak hanya larva kerang Septifer bilocularis (Linnaeus, 1758), yang menempel pada substrat organik dan non organik, tetapi ditemukan larva macrobenthos lainnya, yaitu 2 jenis dari Cerithum egenum (Gould, 1849), dan Calcarina defranci d'Orbigny, 1826, 2 family/genus, yaitu: Canthocamptidae dan Portunidae, dan 2 klass, yaitu : Polychaeta dan Demospongae.  Teridentifikasi jenis larva makro benthos yang baru menempel pada substrat substrat organik dan non-organik dengan ukuran yang bervariasi, yaitu dari 2 mm – 1 cm. Kepadatan jenis macrobenthos yang baru menempel adalah dari 0.03 – 0.5 individu/cm2.  Ada 7 jenis teridentifkasi di lokasi Tiwoho, dan 3 jenis teridentifkasi di Malalayang Kata kunci: Penempelan, Substrat, Pesisir Tiwoho, Pesisir Malalayang  
Suitability Index and Supporting Capacity of Mangrove Ecotourism in Darunu Mangrove Park Wori District North Minahasa Regency Gultom, Fernando; Paruntu, Carolus Paulus; Rumengan, Antonius Petrus; Rumampuk, Natalie D. C.; Paransa, Darus S. J.; Ompi, Medy
Jurnal Ilmiah Platax Vol. 12 No. 1 (2024): ISSUE JANUARY-JUNE 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i1.54566

Abstract

The purpose of the study was to determine the type of mangrove, mangrove density, mangrove thickness, tides, associated biota objects, tourism suitability index, and carrying capacity of the Darunu mangrove tourism area.  The research period is October-December 2023.  The research methods used are cruising survey for mangrove species, line transect for mangrove density, remote sensing for mangrove thickness, and visualization for associated biota objects.  Data analysis for the tourism suitability index (IKW) and area carrying capacity (DDK) is guided by the provisions of Yulianda (2019).  The IKW value is 2.0 with the appropriate category and the DDK value is 25 people per day.  The size of the DDK value of the mangrove tourism area depends on two main factors, namely the length of tracking and the length of operating time.  The greater the value of tracking length and the length of operating time, the greater the DDK value, conversely the smaller the value of tracking length and the length of operating time, the smaller the DDK value.  As a recommendation to the village government to be able to extend the tracking distance by utilizing the mangrove spaces that are still available, in addition to the tourist period can be extended with adequate facilities such as electricity, lighting, etc. so that the value of DDK can still be achieved as much as possible to increase the economic income of the village community while still paying attention to environmental sustainability.  Furthermore, community participation to preserve this mangrove forest area is needed for the sustainability of ecotourism-based mangrove tourism at Darunu Mangrove Park. Keywords: Area carrying capacity, Darunu Mangrove Park, Ecotourism, Mangrove, Tourism suitability index. Abstrak Tujuan penelitian adalah untuk mengetahui jenis mangrove, kerapatan mangrove, ketebalan mangrove, pasang surut air laut, objek biota asosiasi, indeks kesesuaian wisata dan daya dukung kawasan wisata Darunu Mangrove Park.  Periode penelitian yaitu Oktober-Desember 2023.  Metode penelitian yang digunakan yaitu survey jelajah untuk jenis mangrove, transek garis untuk kerapatan mangrove, penginderaan jauh untuk ketebalan mangrove, visualisasi untuk objek biota asosiasi.  Analisis data untuk indeks kesesuaian wisata (IKW) dan daya dukung kawasan (DDK) berpedoman pada ketentuan dari Yulianda (2019).  Nilai IKW sebesar 2,0 dengan kategori sesuai dan nilai DDK sebanyak 25 orang per hari.  Besar kecilnya nilai DDK kawasan wisata mangrove tergantung pada dua faktor utama, yaitu panjang tracking dan lamanya waktu operasi. Semakin besar nilai panjang tracking dan lamanya waktu operasi, maka semakin besar pula nilai DDK tersebut, sebaliknya semakin kecil nilai panjang tracking dan lamanya waktu operasi maka semakin kecil nilai DDK tersebut.  Sebagai rekomendasi kepada pemerintah desa untuk dapat memperpanjang jarak tracking dengan memanfaatkan ruang-ruang mangrove yang masih tersedia, disamping itu periode waktu wisata dapat diperpanjang dengan dilengkapi fasilitas yang memadai seperti listrik, penerangan, dan lain-lain, agar nilai DDK masih dapat dicapai semaksimal mungkin dalam rangka peningkatan pendapatan ekonomi masyarakat desa dengan tetap memperhatikan kelestarian lingkungannya. Selanjutnya peran serta masyarakat untuk menjaga kelestarian kawasan hutan mangrove ini sangat dibutuhkan demi keberlanjutan wisata mangrove berbasis ekowisata di Darunu Mangrove Park. Kata kunci: Daya dukung kawasan, Darunu Mangrove Park, Ekowisata, Indeks kesesuaian wisata, Mangrove.
Blister Pearl Formation in Abalone, Haliotis varia Using Anestesia Gulo, Puji Eli Arnita; Mamangkey, Noldy Gustaf Frans; Ompi, Medy; Manembu, Indri Shelovita Manembu; Kawung, Nickson J.; Ginting, Elvy Like; Angkouw, Esther D.
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i1.60568

Abstract

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 Haliotis varia 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 H. varia 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. Keywords: Pearl, Pearl Production, Abalone, Haliotis varia, Anestesia. Abstrak 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 Haliotis varia 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 H. varia 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. Kata kunci: Mutiara, Produksi Mutiara, Abalone, Haliotis varia, Anestesi.
Priority Strategy for Mangrove Ecotourism Development at Budo Tourism Village Luturkey, Maureen Fenesya; Paruntu, Carolus Paulus; Rumengan, Antonius Petrus; Ompi, Medy; Sumilat, Deiske Adeleine; Manembu, Indri Shelovita
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

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

Abstract

This study was conducted for three months, starting from March to June 2024. The research method used was a qualitative descriptive method with a survey technique.  Data collection was carried out by collecting primary data and secondary data.  Data analysis to formulate priority strategies for developing mangrove ecotourism at Budo Tourism Village using SWOT analysis (strength, weakness, opportunity, threat) and strategy choice analysis to obtain key success factors (priority strategies). The results of this research obtained 7 (seven) priority strategies that can be used by stakeholders, especially BUMDES managers in Budo Village for the development of sustainable mangrove ecotourism. To create a public policy, it is recommended to the Budo Village government, especially the BUMDES manager, to pay attention and consider academic studies from the Faculty of Fisheries and Marine Sciences, UNSRAT, in the form of 7 (seven) key success factors or priority strategies. Keywords: key success factors, mangrove ecotourism, SWOT, strategic choice analysis   Abstrak   Riset ini dilaksanakan di kawasan ekowisata mangrove Desa Wisata Budo dan berlangsung selama 3 bulan, dimulai dari bulan Maret sampai Juni 2024.  Metode riset yang digunakan yaitu metode deskriptif kualitatif dengan teknik survei.  Pengumpulan data dilakukan dengan mengumpulkan data primer dan data sekunder.  Analisis data untuk merumuskan strategi pengembangan ekowisata mangrove Desa Wisata Budo menggunakan analisis SWOT (strength, weakness, opportunity, threat) dan analisis pilihan strategi untuk memperoleh faktor-faktor kunci keberhasilan (strategi prioritas). Hasil penelitian ini memperoleh 7 (tujuh) urutan strategi prioritas yang dapat digunakan oleh stakeholders, khususnya pengelola BUMDES Desa Budo untuk pengembangan ekowisata mangrove yang berkelanjutan. Dalam rangka membuat suatu kebijakan publik direkomendasikan kepada pemerintah Desa Budo, khususnya pengelola BUMDES untuk memperhatikan dan mempertimbangkan kajian akademik dari Fakultas Perikanan dan Ilmu Kelautan Unsrat berupa 7 (tujuh) faktor-faktor kunci keberhasilan atau strategi prioritas tersebut. Kata kunci: Analisis pilihan strategi, ekowisata mangrove, faktor-faktor kunci keberhasilan, SWOT
Nudibranchia Species, Water Quality and Substrate at Malalayang Dua Beach, Manado City Dairivaldo, Kettang Legrant; Paulus, James J.H.; Lumuindong, Frans; Kemer, Kurniati; Pelle, Wilmy E.; Ompi, Medy
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i1.60767

Abstract

This research used the exploration method, where a dive team of three people descended to a subtidal depth of 3 to 10 meters. The dive team surveyed this site for 40 minutes. Measurements of environmental parameters seawater temperature, salinity, pH, dissolved oxygen (DO), Total Dissolved Solids (TDS), and turbidity—were taken using a Horiba U-536 and pH meter. The results identified 11 species. The average pH was 8.24 at Station A (Gasoline Station) and 8.06 at Station B (Malalayang Beach Walk). The average seawater temperature was 28.69°C at Station A and 29.08°C at Station B. Turbidity was 0 NTU at both stations. The dose of dissolved oxygen (DO) was 6.77 mg/L at Station A and 6.92 mg/L at Station B. The salinity was 31.49 ppt at Station A and 31.35 ppt at Station B. Except for TDS, all environmental parameters support Nudibranchia's life. Total Dissolved Solids (TDS) values were 57.73 g/L at Station A and 57.33 g/L at Station B, respectively. These TDS values are unsuitable for benthic marine life since they do not fit their range tolerances. Nudibranchia attached on substrates variations from dead coral with algae (DCA), sponge, algae, and dead coral fragments. The most dominant substrate occupied by Nudibranchia was dead coral with algae (DCA). Keywords: Nudibranchia, Species, Water Quality, Substrate, Malalayang Dua Abstrak Penelitian ini menggunakan metode eksplorasi, di mana tim penyelam yang terdiri dari tiga orang turun ke kedalaman subtidal 3 hingga 10 meter. Tim penyelam melakukan survei di lokasi ini selama 40 menit. Pengukuran parameter lingkungan seperti suhu air laut, salinitas, pH, oksigen terlarut (DO), Total Dissolved Solids (TDS), dan kekeruhan diambil menggunakan Horiba U-536 dan pH meter. Hasil penelitian mengidentifikasi 11 spesies. Rata-rata pH adalah 8,24 di Stasiun A (Gasoline Station) dan 8,06 di Stasiun B (Malalayang Beach Walk). Suhu air laut rata-rata adalah 28,69°C di Stasiun A dan 29,08°C di Stasiun B. Kekeruhan adalah 0 NTU di kedua stasiun. Oksigen terlarut (DO) adalah 6,77 mg/L di Stasiun A dan 6,92 mg/L di Stasiun B. Salinitas adalah 31,49 ppt di Stasiun A dan 31,35 ppt di Stasiun B. Kecuali untuk TDS, semua parameter lingkungan mendukung kehidupan Nudibranchia. Nilai Total Dissolved Solids (TDS) adalah 57,73 g/L di Stasiun A dan 57,33 g/L di Stasiun B. Nilai TDS ini tidak sesuai dengan toleransi kehidupan ‘benthic’ dasar. Dalam penelitian ini, diasumsikan bahwa konsentrasi TDS juga tidak sesuai untuk Nudibranchia. Nudibranchia menempel pada variasi substrat seperti dead coral with alga (DCA), spons, alga, dan pecahan karang mati. Substrat yang paling dominan ditempati oleh Nudibranchia adalah dead coral with alga (DCA). Kata Kunci: Nudibranchia, Jenis-jenis, Kualitas Air, Substrat, Malalayang Dua.
Analysis of Income from Mujair Fish (Oreochromis Massambicus) Cultivation in Tarpon Ponds (Biofloc) (A Case Study of Biofloc Business in Matungkas Village, Minut Regency) Kaunang, Stella T.; Kumentas, Veronicha; Polan, Threis S.; Ompi, Medy
Devotion : Journal of Research and Community Service Vol. 4 No. 12 (2023): Devotion: Journal of Research and Community Service
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/devotion.v4i12.625

Abstract

This research investigates the economic viability of tilapia fish farming utilizing the pond liner method (biofloc) in Matungkas Village, Dimembe Subdistrict, North Minahasa Regency, Indonesia. With the agricultural, animal husbandry, and fisheries sectors playing pivotal roles in supporting Indonesia's economy, the study focuses on the freshwater fisheries potential, particularly tilapia, in North Minahasa. The research delves into the innovative use of biofloc technology, analyzing its benefits such as minimal water and land requirements, efficient feed utilization, and waste conversion into fish feed. Mr. Ronny Lensun's tilapia fish farming business, employing the pond liner method, is examined. Despite the region's rich natural resources, the income calculation method used by the owner is identified as simplistic. The study employs quantitative methods to perform a comprehensive income analysis, considering revenue, production costs, and financial metrics. Results demonstrate the profitability of Mr. Ronny Lensun's business, with a break-even point at a selling price of IDR 1,167,807.9 and a production volume of 33.36 kg. The Revenue Cost Ratio (R/C) is calculated at 1.85, indicating the business's sustainability and profitability. The literature review encompasses the biofloc technology and business analysis, emphasizing its advantages in water quality maintenance, organic matter decomposition, and feed efficiency. The study contributes to understanding the economic feasibility of tilapia fish farming with the biofloc method, suggesting potential for wider adoption and development in the region.
Identification and Density of Bivalves on Coral Reef Flats in The Water of Mandolang and Malalayang, North Sulawesi Lolaro, Wildy; Ompi, Medy; Manembu, Indri; Djamaludin, Rignolda; Roeroe, Kakaskasen; Rimper, Joice
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66011

Abstract

The research problems addressed in this study were what species of bivalve and what densities each species of bivalves inhabit on the coral reef flats both  Mandolang and Malalayang, North Sulawesi. This study aimed to identify the species of bivalves and the species density of bivalves.  Data were collected using a belt transect method measuring 20 m in length and 1 m in width on both the left and right sides of the transect line at a depth of 3 m. Three belt transects as replicates were deployed at each site of coral reef.  All specimens of bivalves encountered were documented and identified, and species density values were subsequently calculated. The results revealed four bivalve species, namely Tridacna maxima, Tridacna crocea, Ruditapes philippinarum, and Barbatia barbata. T. crocea, T. maxima, and R. philippinarum were identified only in Mandolang, whereas R. philippinarum, B. barbata, and T. crocea were identified in Malalayang. Furthermore, R. philippinarum and T. crocea were found in both Mandolang and Malalayang. Bivalve density in Mandolang varied among species, with T. crocea at 2.67 ind/40 m² (0.07 ind/m²), T. maxima at 1.33 ind/40 m² (0.03 ind/m²), and R. philippinarum at 0.67 ind/40 m² (0.02 ind/m²). Similarly, in Malalayang waters, R. philippinarum showed the highest density at 10.33 ind/40 m² (0.26 ind/m²), while B. barbata and T. crocea exhibited the same average density of 1.33 ind/40 m² (0.03 ind/m²). Key words: Bivalves, Density, Coral reef, Mandolang, Malalayang   Abstrak Rumusan masalah dalam penelitian ini adalah apa saja jenis- jenis bivalva yang menempati habitat terumbu karang di Perairan Mandolang dan Malalayang, Sulawesi Utara, dan bagaimana kepadatan jenis-jenis bivalvia di perairan Mandolang dan Malalayang Sulawesi Utara. Penelitian ini bertujuan untuk mengidentifikasi jenis-jenis bivalva yang menempati substrat karang serta mengetahui kepada jenis-jenis bivalva yang menempati rataan karang di Mandolang dan Malalayang Sulawesi Utara. Metode pengambilan data menggunankan belt transect sepanjang 20m dengan lebar 1m ke kiri dan 1m ke kanan garis transek pada ke dalaman 3 meter. Tiga ‘belt transek’ sebagai ulangan telah digunakan dalam pengambilan sampel di setiap rataan karang ini.  Sampel yang ditemukan didokumentasikan dan diidentifikasi, kemudian nilai kepadatan jenis bivalvia dihitung.  Hasil penelitian terdapat empat jenis bivalvia, yaitu T. maxima, T. crocea, Ruditapes philippinarum, dan  Barbatia barbata.  T. crocea, T. maxima, Ruditapes philippinarum teridentifikasi hanya di Mandolang, sedangkan Ruditapes philippinarum, Barbatia barbata, T. crocea teridentifikasi hanya di Malayang.  Ruditapes philippinarum, dan T. crocea teridentifikasi baik di Mandolang dan Malalayang.  Kepadatan bivalvia pada perairan Mandolang bervariasi menurut jenis, yaitu T. crocea (2,67 ind/40m2) atau 0,07 ind./m2, T. maxima (1,33 ind/40m2) atau 0,03 ind./ m2, dan Ruditapes philippinarum 0,67 ind/40m2 atau 0,02ind./ m2), demikian pula dengan yang di Malalayang, yaitu: Ruditapes philippinarum dengan 10,33 ind/40m2, atau 0,26 ind./m2, selanjutnya masing jenis memiliki kepadatan rata-rata yang sama, yaitu Barbatia barbata dan T. crocea dengan 1,33 ind./40m2, atau 0,03 ind./ m2. Kata kunci: Bivalvia, Kepadatan, Terumbu karang, Mandolang, Malalayang
Co-Authors Adnan S. Wantasen Alex D Kambey Andika R Balansada Angkouw, Esther D. Anna Rejeki Simbolon, Anna Rejeki Antonius P Rumengan Antonius Rumengan Ari B. Rondonuwu Azzahra Aulina Billy Th Wagey Billy Theodorus Wagey Boneka, Farnis B. Boneka Calvyn Calvyn Calvyn F. A. Sondak, Calvyn F. A. Calvyn, Calvyn Carolus P Paruntu Carolus Paulus Paruntu Chatrien A Sinyal Cyska Lumenta Dairivaldo, Kettang Legrant Darus S. Paransa Darwasito, Suria daud, fitran Djamaaludin, Rignolda Ekel, Jouvan Randy Erly Y. Kaligis, Erly Y. Ernawati Widyastuti, Ernawati Esry T. Opa F. A. Sondak Farnis B Boneka Farnis B. Boneka Fernando Gultom, Fernando Fontje Georis Judri Kaligis Frans Lumoindong Fransine B. Manginsela Ginting, Elvy Like Grevo S Gerung Gulo, Puji Eli Arnita Handayani, Maymanah Indri Manembu Jane M. Mamuaja Janny D. Kusen Jety K Rangan Joice R.T.S.L Rimper Joppy Mudeng Joshian N.W. Schaduw Kaligis, Early Y. Kaligis, Erly Yosef Kaligis, Georis Kawung, Nickson Khristin I. F. Kondoy, Khristin I. F. Klaudio Mauli Kumampung, Deislie Roxmerie H. Kumentas, Veronicha Kurniati Kemer Lalita, Jans D. Lawrence J. L. Lumingas Lawrence J.L. Lumingas Lintang, Rosita A.J. Lolaro, Wildy Lumingas, Aaron R. T. Lumuindong, Frans Luturkey, Maureen Fenesya Mamangkey, Noldy G.F Mamangkey, Noldy Gustaf Frans Mamuaja, Jane M. Manaida, Frendi Manembu, Indri Shelovita Manembu Manengkey, Hermanto Wem Kling Mantiri, Desy M. H Menajang, Febry S. I. Natalie D Rumampuk Nego E Bataragoa Nickson J. Kawung, Nickson J. Nickson Kawung Ode Mantra, Syahrun Otinus Lokbere Palit, Deyti A. Pangkey, Henneke D. Pansing, Jenita Paransa, Darus Sa’adah Johanis Paringgi, Ezra Paulus, James Pelle, Wilmy E. Petrick Billy Podung, Thania Theresia Polan, Threis S. Pungus, Faldy Rampengan, Royke Rangan, Jety Rangan, Jety K. Rembet, Unstain Rene Charles Kepel, Rene Charles Rignolda Djamaludin Rimper, Abraham M. Rimper, Joice R. T. S. L Rimper, Joice Rinefi T.S.L Rizald Max Rompas, Rizald Max Roeroe, Kakaskasen Andreas Rose OSE Mantiri Royke M. Rampengan Ruddy D Moningkey Rumampuk, Natalie Detty C Rumengan, Antonius Petrus Rustikasari, Irna Salaki, Meiske S. Sambali, Hariyani Saragih, Hans S. R. P. Sarif Hidayat Silvester B Pratasik Sondak, F. A. Stella T. Kaunang Stenly Wullur Sumilat, Deiske Adeleine Suria Darwisito Susan M. Sumampouw Suzanne L Undap Tambunan, Rose Agustin Veibe Warouw Verisandria, Rio Winda Mercedes Mingkid Wulandari, Diah Anggraini