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All Journal Bawal : Widya Riset Perikanan Tangkap Tomini Journal of Aquatic Science
Mochhamad Ikhsan Cahya Utama
Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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PENGARUH VARIABILITAS OSEANOGRAFI TERHADAP CPUE IKAN TONGKOL (Euthynnus spp) MENGGUNAKAN GENERALIZED ADDITIVE MODEL DI PERAIRAN TERNATE Gilar Budi Pratama; Lady Ayu Sri Wijayanti; Mochhamad Ikhsan Cahya Utama; Nurani Khoerunnisa; Aisyah Aisyah
BAWAL Widya Riset Perikanan Tangkap Vol 18, No 1 (2026): April 2026
Publisher : Politeknik Kelautan dan Perikanan Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/bawal.18.1.2026.23-33

Abstract

Perairan Maluku merupakan salah satu wilayah perikanan strategis di Indonesia yang berperan sebagai habitat penting bagi ikan tongkol (Euthynnus spp.), komoditas pelagis bernilai ekonomi tinggi. Distribusi dan kelimpahan ikan tongkol di wilayah ini sangat dipengaruhi oleh dinamika oseanografi yang bersifat spasial dan temporal. Penelitian ini bertujuan untuk menganalisis pengaruh berbagai parameter oseanografi terhadap variasi Catch Per Unit Effort (CPUE) ikan tongkol di perairan sekitar PPN Ternate selama periode 2021–2023. Analisis dilakukan menggunakan pendekatan Generalized Additive Model (GAM) untuk menangkap hubungan non-linear antara CPUE dan variabel lingkungan. Variabel prediktor yang digunakan meliputi suhu permukaan laut, konsentrasi klorofil-a, kecepatan arus, salinitas, tinggi muka air laut, dan intensitas thermal front. Hasil pemodelan menunjukkan bahwa kombinasi seluruh variabel menghasilkan model terbaik dengan nilai Akaike Information Criterion (AIC) sebesar 453,72, yang mengindikasikan bahwa variasi CPUE tongkol lebih akurat dijelaskan oleh interaksi multivariabel dibandingkan pengaruh variabel tunggal. Uji signifikansi menunjukkan bahwa klorofil-a (p = 0,0356), kecepatan arus (p = 0,0041), dan thermal front (p = 0,0483) berpengaruh nyata terhadap CPUE. Kurva respons mengindikasikan bahwa produktivitas primer, dinamika arus, dan keberadaan thermal front merupakan faktor utama yang mengendalikan pola agregasi ikan tongkol di perairan PPN Ternate.
The Effect of Liquid Organic Fertilizer Application on the Growth of Microalgae Chlorella sp. Lady Ayu Sri Wijayanti; Mochhamad Ikhsan Cahya Utama; Andini Nur Afifah; Annisa Rahmah Septiani; Muhammad Wijatmikko Ginang Pratidnia; Yuyun Yuningsih; Sara Umbekna; Sitty Ainsyah Habibie
Tomini Journal of Aquatic Science VOLUME 4 ISSUE 1, NOVEMBER 2025
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v4i1.33254

Abstract

Microalgae such as Chlorella sp. are valuable for their potential in sustainable food, feed, and bioenergy production, but their cultivation often relies on costly synthetic nutrients. Exploring alternative nutrient sources, such as liquid organic fertilizers, may offer a more economical and environmentally friendly approach to biomass production. This study aims to evaluate the effect of liquid organic fertilizer application on the growth of Chlorella sp. in a closed culture system. Seven treatments were used: one control without fertilizer (K) and six treatments with increasing fertilizer doses (P1–P6). The observed parameters included initial and final cell density, as well as daily growth rate during a seven-day incubation period. The results showed that fertilizer application had a significant effect on the growth enhancement of Chlorella sp. The highest final cell density was recorded in treatment P6, exceeding 6.3 × 10⁷ cells/ml, while a population decline was observed in the control group. The daily growth rate also increased with higher fertilizer doses, with the highest value (μ = 0.36) observed in P6. Linear regression analysis showed a strong relationship between fertilizer amount and growth rate (r = 0.8493; p = 0.0156; R² = 0.7213), indicating that growth variation could be significantly explained by the amount of fertilizer applied. The conclusion of this study is that liquid organic fertilizer has great potential as an efficient and environmentally friendly alternative for microalgae culture media. Proper dosage formulation can support optimal microalgal biomass production. Further research is needed to identify the dominant nutrient content in the fertilizer and to assess the biomass quality for potential applications in food, feed, or bioenergy sectors.
Co-Authors Aisyah Aisyah Andini Nur Afifah Annisa Rahmah Septiani Gilar Budi Pratama Lady Ayu Sri Wijayanti Muhammad Wijatmikko Ginang Pratidnia Nurani Khoerunnisa Sara Umbekna Sitty Ainsyah Habibie Yuyun Yuningsih