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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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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 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 Diah Anggraini Wulandari Djamaaludin, Rignolda Ekel, Jouvan Randy Erly Y. Kaligis Erly Y. Kaligis, Erly Y. Ernawati Widyastuti Esry T. Opa F. A. Sondak Farnis B Boneka 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