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All Journal Journal of Aquatropica Asia Jurnal Kelautan Tropis
Munru, Maestro
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Perbandingan Kondisi Terumbu Karang dan Hubungannya dengan Ikan Karang di Perairan Karimunjawa dan Bali Ayu, Trifajriah Lutea; Munasik, Munasik; Trianto, Agus; Munru, Maestro
Jurnal Kelautan Tropis Vol 28, No 2 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i2.22473

Abstract

 This study aims to compare the ecological conditions of coral reefs and reef fish communities between the shallow waters of Karimunjawa, Jepara (Java Sea) and North Bali waters (Buleleng Regency). The research was conducted at 6 stations (2 stations in Karimunjawa and 4 stations in Bali) with different depths. The coral reef observation method used Underwater Photo Transect (UPT), while reef fish observation was conducted using the Underwater Visual Census (UVC) method. Results showed that coral reef conditions in general were not significantly different between locations. However, the abundance, biomass and biodiversity of reef fishes were significantly different between Karimunjawa and Bali. Further analysis showed that coral growth form (lifeform) was a strong predictor of reef fish community structure, and related to reef fish trophic groups (corallivores, herbivores and carnivores). The abundance and diversity of reef fish species were not only influenced by live coral cover, but also by the complexity of habitat structure. These findings highlight the importance of local oceanographic and topographic factors in supporting reef fish abundance and diversity. Penelitian ini bertujuan untuk membandingkan kondisi ekologi terumbu karang dan komunitas ikan karang antara perairan dangkal Karimunjawa, Jepara (Laut Jawa) dan perairan Bali Utara (Kabupaten Buleleng). Penelitian dilakukan pada 6 stasiun (2 stasiun di Karimunjawa dan 4 stasiun di Bali) dengan kedalaman yang berbeda. Metode pengamatan terumbu karang menggunakan Underwater Photo Transect (UPT), sementara pengamatan ikan karang dilakukan dengan metode Underwater Visual Census (UVC). Hasil menunjukkan bahwa kondisi terumbu karang secara umum tidak berbeda nyata antar lokasi. Namun, kelimpahan, biomassa dan biodiversitas ikan karang berbeda nyata antara Karimunjawa dan Bali. Analisis lebih lanjut menunjukkan bahwa bentuk pertumbuhan karang (lifeform) adalah prediktor kuat struktur komunitas ikan karang, dan berhubungan dengan kelompok trofik ikan karang (koralivora, herbivora dan karnivora) Kelimpahan dan keragaman jenis ikan karang tidak hanya dipengaruhi oleh tutupan karang hidup, tetapi juga oleh kompleksitas struktur habitat. Temuan ini menyoroti pentingnya faktor oseanografi lokal dan topografi dalam mendukung kelimpahan dan keanekaragaman jenis ikan karang.
PENINGKATAN BIOMASSA NANNOCHLOROPSIS OCULATA MELALUI OPTIMASI KULTUR PADA SKALA LABORATORIUM DAN SKALA MENENGAH Munru, Maestro; Wulandari, Yola; Sari, Herni Iman; Syafitri, Novita nanda; Maulana, Alfiqi; Ayu, Trifajriyah Lutea
Journal of Aquatropica Asia Vol 10 No 2 (2025): Journal of Aquatropica Asia
Publisher : Program Studi Akuakultur, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/11765564

Abstract

Nannochloropsis oculata, a versatile microalga, holds immense potential in the field of marine biotechnology. Its benefits are far-reaching, particularly in sectors like aquaculture. To fully exploit this potential, effective strategies for increasing its biomass are essential. This study aims to determine the technique of laboratory-scale Nannochloropsis Oculata phytoplankton culture, as well as the phases of its growth and development. The culture process, spanning from 200 ml to 40 L, was Meticulously observed and documented. Daily observations were made from the first day of culture until the research was completed, using a haemacytometer on a binocular microscope with a magnification of 400. The observation results of Nannochloropsis oculata growth showed varying dynamics from the first to the fifth day. Overall, no significant growth was observed; however, fluctuations were noted in each phase of the growth period during the study. In 200 ml and 1 L volume cultures, Nannochloropsis oculata showed a short lag phase (1-2 days) followed by a significant increase in biomass up to 11 million cells/ml in the exponential phase (days 3 to 5). Controlled and stable conditions at small volumes favored cell adaptation and optimal replication. In contrast, the 15 L volume culture showed a more extended lag phase, indicating sensitivity to environmental changes. The most significant anomaly occurred in the 40 L culture, where a drastic decrease in biomass occurred after the second to third day, signaling culture failure. Microscopic analysis confirmed protozoan contamination as the etiological agent, which was assumed to originate from the surrounding environment due to exposure to the culture medium.
Co-Authors Agus Trianto Ayu, Trifajriah Lutea Ayu, Trifajriyah Lutea Maulana, Alfiqi Munasik Munasik Sari, Herni Iman Syafitri, Novita nanda Yola Wulandari, Yola