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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Kelautan Tropis
Agus Trianto
Department of Marine Sciences, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro
Earth & Planetary Sciences

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Nutrient Enrichment Impact of Wastewater Shrimp Ponds on Coral Reefs of Nyamplungan Village, Karimunjawa Raja Aditya Sahala Siagian; Agus Sabdono; Sunaryo Sunaryo; Agus Trianto; Dio Dirgantara
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 3 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.3.267-278

Abstract

Increased nutrients can cause a rise prevalence in coral disease. Shrimp pond wastewater can produce nitrate, phosphate, and ammonia from the residual of the feeding and shrimp feces. Nyamplungan village, Karimunjawa was selected as the study site as it represents a location with shrimp pond activity that close to coral reef ecosystem. This study aims to examine the difference of disease prevalence, coral cover, and coral genus diversity at ±300 m and ±1000 m from the shrimp pond and to examine the relationships between disease prevalence and nutrients (nitrate, phosphate, ammonia). Coral disease prevalence was measured within a modified 30 x 2 m belt transect at six sampling stations. Station 1, 2, and 3 were 6-8 m in depth (±1000 m from the shrimp pond), then station 4, 5, and 6 were depth 1-3 m (±300 m from the shrimp pond). Coral genus diversity was conducted by using the Roving Diver Visual Method. Coral cover was measured within Line Intercept Transect (LIT) 30 m. The results show that station 5 had the highest disease prevalence (30.80%±2.78%). Station 1 had highest coral cover (90.87%±7.16%). Coral genus diversity had a medium category for each station. Disease prevalence was significantly different between station depths of 1-3 m (±300 m to the shrimp pond) and depths 6-8 m (±1000 m from the shrimp ponds) (P<0.05). Disease prevalence had strong relationship with nitrate (r= 0.975), phosphate (r= 0.972) and ammonia (r= 0.958). These results suggest that the continuation of coral monitoring with additional disease incidence and disease progression, temporally.
Study on the anti-vibrio activity of marine fungi Aspergillus sydowii and Rhizopus sp. using OSMAC Approach Galank Fad&#039;qul Janarkho; Agus Trianto; Sri Sedjati; Rindiani Puja Listari
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.20451

Abstract

Shrimp is one of the major aquaculture products in Indonesia. However, shrimp culture faces the peril of Vibriosis, a disease caused by the bacteria genus of Vibrio.  Marine sponge-associate microbes are recognized for their potential as sources of antibacterial agent. The fungus Aspergillus sydowii isolate that used in this research originally isolated from marine sponge collected in Lampung Bay. The fungus was grown in various media e. g. Malt extract agar (MEA), MEA-Tempeh broth (MEA-T), and tofu dregs (TD) under various pH (5.5, 7.5, and 9.5).  The fungus also be culture as mono-culture and co-culture with Rhizopus sp. The anti-vibrio assay was conducted using disk diffusion method. Based on anti-vibrio assay, the fungus A. sydowii and Rhizopus sp. didn’t show any correlation with the anti-vibrio compound produced. The fungus Rhizopus sp. cultivated in tofu dregs media (TD) at pH 5.5 exhibited the highest potential for inhibiting against V. alginolyticus (5.85±0.24 mm), V. harveyi (5.20±0.20 mm), and V. vulnificus (4.33±0.15 mm), while the co-culture (A. sydowii and Rhizopus sp.) in TD media and pH 7.5 against V. parahaemolyticus (5.55±0.86 mm). The fungus cultured in pH 7.5 can promotes the potential inhibition zone than a pH 9.5. 
Co-Authors Agus Sabdono Dio Dirgantara Galank Fad&#039;qul Janarkho Raja Aditya Sahala Siagian Rindiani Puja Listari Sri Sedjati Sunaryo Sunaryo