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All Journal Journal of Fish Health
Awan Dermawan
Study Program of Aquaculture, Department of Fisheries and Marine Science, Faculty of Agriculture, University of Mataram
Agriculture, Biological Sciences & Forestry

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Effectiveness of Octopus (Octopus sp.) Ink Extract on the Growth of Mozambique Tilapia (Oreochromis mossambicus) Infected with Aeromonas hydrophila Elsa Sabathini; Rangga Idris Affandi; Awan Dermawan
Journal of Fish Health Vol. 6 No. 2 (2026): Journal of Fish Health
Publisher : Study Program of Aquaculture, Department of Fisheries and Marine Science, Faculty of Agriculture, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jfh.v6i2.10117

Abstract

Mozambique tilapia (Oreochromis mossambicus) is an important aquaculture commodity in Indonesia; however, its productivity can be constrained by disease outbreaks, including Aeromonas hydrophila infection. The use of natural feed additives containing nutritional and bioactive compounds is a promising strategy to improve fish growth and health. This study aimed to evaluate the effectiveness of octopus (Octopus sp.) ink extract supplemented in feed on the growth performance of Mozambique tilapia infected with A. hydrophila. The study was conducted for 45 days using a completely randomized design with five treatments and three replications. The treatments consisted of a positive control, namely feed without octopus ink extract with A. hydrophila infection (K+); a negative control, namely feed without octopus ink extract and without A. hydrophila infection (K-); and feed supplemented with octopus ink extract at 50, 100, and 150 ml/kg feed followed by A. hydrophila infection (A, B, and C, respectively). The observed growth parameters were absolute weight gain, absolute length gain, specific weight growth rate, and specific length growth rate. The results showed that octopus ink extract supplementation improved all growth parameters compared with the positive control. The best performance was obtained in treatment B (100 ml/kg feed), with an absolute weight gain of 10.77±1.53 g, absolute length gain of 2.65±0.39 cm, specific weight growth rate of 2.59±0.11%/day, and specific length growth rate of 2.16±0.05%/day. Therefore, octopus ink extract has potential as a natural feed additive to enhance the growth performance of Mozambique tilapia challenged with A. hydrphila.
Potential of Local Microalgae from Lembar Bay Waters for Climate Change Mitigation: Insights from Photosynthetic Assimilation Index Damai Diniariwisan; Alis Mukhlis; Bagus Dwi Hari Setyono; Awan Dermawan; Rizky Regina Kawirian; Sri Hikmah Wulandari
Journal of Fish Health Vol. 6 No. 3 (2026): Journal of Fish Health
Publisher : Study Program of Aquaculture, Department of Fisheries and Marine Science, Faculty of Agriculture, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jfh.v6i3.11802

Abstract

Climate change mitigation requires innovative approaches to reduce atmospheric carbon dioxide (CO₂) through efficient and sustainable carbon fixation. Microalgae are promising biological agents because of their photosynthetic capacity to assimilate inorganic carbon into biomass. This study aimed to assess the potential of local microalgae communities in Lembar Bay waters, West Lombok, as carbon assimilation agents based on the relationship between chlorophyll-a, net primary productivity (NPP), and assimilation index. The study was conducted from March to May 2026 at five sampling stations, with three sampling periods at 30-day intervals. Phytoplankton samples were collected using a plankton net and identified microscopically, while chlorophyll-a was analyzed spectrophotometrically. NPP was determined using the light-and-dark bottle method based on changes in dissolved oxygen during a six-hour incubation period. The relationships among environmental parameters, chlorophyll-a, and NPP were analyzed using Spearman correlation. The results showed a relatively strong positive correlation between chlorophyll-a and NPP (r = 0.727), indicating that higher phytoplankton biomass was associated with greater photosynthetic productivity. Chlorophyll-a showed weak correlations with nitrate (r = −0.045) and phosphate (r = −0.107). The assimilation index varied among stations, ranging from 6.13 to 11.51 (mg C mg Chl-a⁻¹ hour⁻¹), with the highest value at Station 4 and the lowest at Station 5. These findings indicate that local microalgae in Lembar Bay have potential for biological carbon assimilation and may support climate change mitigation. However, further species-specific cultivation and controlled photobioreactor experiments are required to validate their CO₂ fixation capacity and long-term carbon sequestration potential.
Co-Authors Alis Mukhlis Bagus Dwi Hari Setyono Damai Diniariwisan Elsa Sabathini Rangga Idris Affandi Rizky Regina Kawirian Sri Hikmah Wulandari