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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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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.
Abalone Haliotis varia in Tanjung Likupang, North Minahasa, North Sulawesi Marongi, Bill A.; Ompi, Medy; Kaligis, Erly Y.; Boneka, Farnis B.; Lintang, Rosita A. J.; Mamuaja, Jane M.
JURNAL PESISIR DAN LAUT TROPIS Vol. 13 No. 3 (2025): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.13.3.2025.64846

Abstract

Abalone (Haliotis varia) is a marine gastropod commonly known as a seven-eyed shell or sea snail. It serves as an important source of marine protein and plays a significant economic role for coastal communities. The abalone has been caught easily by fisherman.  As a result, the abalone population might decrease.  However, there has been limited information of its population in nature up to now. This study aimed to assess the species, density, size, and distribution pattern of abalone in the intertidal zone of Tanjung Likupang, North Sulawesi. Sampling was conducted using the quadrat transect method, with six 25×25 meter (625 m²) placed at two different sites. Each site had 3 replicated.  The results showed variations in abalone density between the two locations. Site 2 had a higher mean density (9.67 individuals/625 m² or 0.02 individuals/m²) compared to Site 1 (7 individuals/625 m² or 0.01 individuals/m²). Size variation at site 1 ranged from 32.9 mm to 52.1 mm (average 40.59 mm), while Site 2 ranged from 20.3 mm to 44 mm (average 38.78 mm). However, statistical analysis indicated no significant difference in both average density and shell length between the two sites. Morisita’s index value was approximately 1 for both locations, suggesting a random distribution pattern. These findings provide a preliminary understanding of the current status of abalone populations in Tanjung Likupang. Keywords: Abalone, Haliotis varia, density, size distribution   Abstrak Abalon (Haliotis varia) merupakan gastropoda laut yang dikenal sebagai sumber protein dan bernilai ekonomi tinggi bagi masyarakat pesisir. Abalone mudah ditangkap di alam oleh nelayan.  Hingga populasinya dihipotesa telah menurun di alam.  Namun informasi tentang popualsi abalone adalah masih terbatas sampai saat ini.  Penelitian ini bertujuan untuk mengetahui jenis, kepadatan, ukuran, dan pola distribusi abalon di daerah pasang surut Tanjung Likupang, Sulawesi Utara. Metode yang digunakan adalah transek kuadrat, dengan ukuran 25x25 m (625 m²) ditemaptkan di 2 lokasi.  Maisng-masing lokasi memiliki 3 replikasi. Hasil penelitian menunjukkan adanya variasi kepadatan abalon antara kedua lokasi. Lokasi 2 memiliki kepadatan rata-rata lebih tinggi (9,67 individu/625 m² atau 0,02 individu/m²) dibandingkan dengan lokasi 1 (7 individu/625 m² atau 0,01 individu/m²). Ukuran panjang abalon di lokasi 1 berkisar antara 32,9 mm hingga 52,1 mm, dengan rata-rata 40,59 mm, sedangkan di lokasi 2 berkisar antara 20,3 mm hingga 44 mm, dengan rata-rata 38,78 mm. Meskipun terdapat perbedaan angka, uji statistik menunjukkan tidak ada perbedaan signifikan dalam kepadatan maupun ukuran panjang antara dua lokasi. Nilai indeks Morisita di kedua lokasi mendekati 1, mengindikasikan pola distribusi individu abalon bersifat acak. Temuan ini memberikan gambaran awal tentang kondisi populasi abalon di kawasan Tanjung Likupang. Kata Kunci: Abalon, Haliotis varia, kepadatan, distribusi ukuran
Co-Authors Adnan S. Wantasen Alex D Kambey Andika R Balansada Angkouw, Esther D. Anna Rejeki Simbolon Antonius P Rumengan 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 Kasenda, Vildo Kaunang, Stella T. 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. Lintang, Rosita AJ Lumingas, Aaron R. T. Lumuindong, Frans Luturkey, Maureen Fenesya Mamangkey, Gustaf N. 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 Marongi, Bill A. 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 C. Kepel, Rene C. 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 Tilaar , Sandra Veibe Warouw Verisandria, Rio Winda Mercedes Mingkid