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Maulana, Alfiqi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Energy Immunology & microbiology Physics

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Analisis Pola Pertumbuhan, Faktor Kondisi dan Eksploitasi Madidihang (Thunnus albacares) yang Didaratkan di TPI Linau Kabupaten Kaur Muqsit, Ali; Suci, An Nisa Nurul; Mahfudz, Akbar Abdurrahman; Ariasari, Ana; Nabiu, Nur Lina Maratana; Zamdial, Zamdial; Pratama, Benny Pabio; Syukhriani, Silvi; Selvika, Zerli; Maulana, Alfiqi
Jurnal Laut Khatulistiwa Vol 8, No 2 (2025): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v8i2.94493

Abstract

Ikan Tuna Sirip Kuning merupakan jenis ikan yang penting secara ekonomi, menyebar hampir ke seluruh perairan Indonesia termasuk Perairan Kaur. Salah satu parameter terkait upaya pemanfaatan berkelanjutan adalah pola pertumbuhan dan eksploitasi, faktor ini merupakan salah satu aspek dalam memperkirakan kondisi populasi ikan Tuna Sirip Kuning di perairan yang meliputi perkiraan usia, pertumbuhan, dan kematian. Tujuan penelitian untuk mengidentifikasi aspek biologis termasuk distribusi ukuran, parameter pertumbuhan dan laju eksploitasi ikan Tuna Sirip Kuning yang di daratkan di Kabupaten Kaur. Penelitian dilakukan pada September 2022 - Agustus 2023. Pengambilan sampel dilakukan di TPI Linau, Kabupaten Kaur. Data meliputi panjang dan berat ikan. Ikan Tuna Sirip Kuning diperoleh 275 sampel ikan tuna sirip kuning dengan interval kelas 68-193 cmFL. Hubungan antara panjang dan berat badan termasuk dalam alometrik negatif 2,91 dengan nilai faktor kondisi (Kn) 123-1,45. Parameter pertumbuhan menunjukkan nilai panjang asimtotik (L∞) 194,25 cmFL, dengan nilai koefisien pertumbuhan (K) 0,33 tahun-1 dan nilai Lc 146 cm. Perkiraan tingkat kematian dan eksploitasi adalah total kematian (Z) 1,11 tahun-1, mortalitas alami (M) 0,48 tahun-1, mortalitas akibat penangkapan (F) 0,63 tahun-1, tingkat eksploitasi (E) 0,57 tahun-1.
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 Ali Muqsit, Ali Ana Ariasari Ayu, Trifajriyah Lutea Mahfudz, Akbar Abdurrahman Munru, Maestro Nur Lina Maratana Nabiu Pratama, Benny Pabio Sari, Herni Iman Selvika, Zerli Suci, An Nisa Nurul Syafitri, Novita nanda Syukhriani, Silvi Yola Wulandari, Yola Zamdial Zamdial, Zamdial