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All Journal Journal of Aquaculture and Fish Health
Khairun Nisaa
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Agriculture, Biological Sciences & Forestry

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Disease Dynamics in Hard Corals: Transmission Study of Desulfovib-rio salexigens and Acinetobacter sp Rahmi; Jompa, Jamaluddin; Khairun Nisaa; Akmal
Journal of Aquaculture and Fish Health Vol. 14 No. 2 (2025): JAFH Vol. 14 No. 2 June 2025
Publisher : Department of Aquaculture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jafh.v14i2.68325

Abstract

The objective of this study was to analyze the dynamics of spread and tissue damage due to infection with Black Band Disease (BBD) on Pachyseris sp. and Brown Disease (BrB) on Acropora sp. Additionally, the effect of ambient temperature on transmission rates was investigated. The results demonstrated that BBD on Pachyseris sp. caused progressive tissue damage, characterized by zones of necrosis and distinctive black bands separating healthy tissue from dead tissue. At 31°C, the disease transmission rate increased twofold compared to 29°C, with an infection rate reaching 1.72 ± 0.76 cm/day. BrB on Acropora sp. showed the highest infection rate reaching 2.20 ± 0.41 cm/day at 29°C with a bacterial concentration of 106 CFU/ml. However, the infection rate decreased significantly at 31°C for all bacterial concentrations tested. The disease propagated linearly along the coral branches, manifesting as yellowish-brown discolouration attributable to symbiont ciliate activity. The virulence of pathogens such as Acinetobacter sp. increased at 31°C, accelerating the spread of necrosis through the production of toxins and enzymes that damage the coral epithelium. BrB symptoms appeared within 2 days at 29°C and only 1 day at 31°C. This study confirms that high temperature and sedimentation play a key role in accelerating disease dynamics in corals. Increasing seawater temperatures due to global climate change create ideal conditions for the spread of disease, threatening the sustainability of coral reef ecosystems. To mitigate these challenges, a multifaceted approach involving environmental management, carbon emission reduction, and the development of biotechnology to enhance coral resistance to pathogens is essential.
Evaluating Alternative Feed Additives: The Role of Caulerpa race-mosa and Probiotics in Enhancing Catfish (Clarias gariepinus) Aqua-culture Performance muchdar, Fatma; Juharni; Abdullah, Nursanti; Khairun Nisaa; Suryani, Suryani; Sudrajat, Iman
Journal of Aquaculture and Fish Health Vol. 15 No. 1 (2026): JAFH Vol. 15 No. 1 February 2026
Publisher : Department of Aquaculture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jafh.v15i1.71776

Abstract

This study evaluated the effects of Caulerpa racemosa and probiotics on the growth performance, survival, and feed utilisation of African catfish (Clarias gariepinus) fingerlings. Four treatments were formulated: A (25g C. racemosa + 6mL probiotics), B (50g C. racemosa + 6mL probiotics), C (75g C. racemosa + 6mL probiotics), and D (control, no additives). The highest weight gain (27.80±1.62g) and most efficient feed conversion ratio (FCR) were observed in the control group, attributed to its optimal protein (17.82%) and fat (10.51%) content. Treatment A yielded moderate growth (19.35±2.45g) with the lowest FCR (1.62±0.03), indicating a potential synergistic effect of low-level C. racemosa and probiotics. In contrast, Treatments B and C resulted in reduced growth (17.72±0.47g and 16.92±1.09g, respectively), likely due to high levels of dietary carbohydrate (up to 61.56%) and ash (up to 24.25%), which impaired nutrient assimilation. Survival rates were uniformly high across treatments (93.3–100%), confirming the safety of these additives. The findings underscore the importance of dosage in functional feed formulations, highlighting that excessive seaweed inclusion may compromise performance, while low-level supplementation in combination with probiotics offers promising benefits for sustainable aquaculture.
Co-Authors Abdullah, Nursanti Akmal Iman Sudrajat Jamaluddin Jompa Juharni Muchdar, Fatma Rahmi Suryani Suryani