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All Journal Advances in Tropical Biodiversity and Environmental Sciences
Hamdanul Fain
Ganesha of Education University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Immunology & microbiology Medicine & Pharmacology Veterinary Other

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Mineral Content Comparison of Sea Grapes (Caulerpa lentillifera) Cultivated in Controlled and Free Waters Putu Dhena Viyanti Widianita; Kadek Lila Antara; Gressty Sari Br Sitepu; Hamdanul Fain
Advances in Tropical Biodiversity and Environmental Sciences Vol. 7 No. 3 (2023): October 2023: Pages 87-124
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2023.v07.i03.p06

Abstract

The availability of sea grapes is still very limited, so activities are needed to support the preservation of sea grapes that are rich in mineral content. This research aims to determine growth, water quality, and comparison of mineral content found in C. lentillifera. This type of research is descriptive qualitative. As a research model, namely the mineral content of C. lentillifera in cultivation sites and free waters. On the growth of C. lentillifera, calculate the number of ramuli and water quality, such as pH, temperature, and salinity, with a water quality checker. Data on the mineral content in C. lentillifera was obtained by atomic absorption spectrophotometry (AAS). Based on the results of absorption measurements from several solutions at the cultivation location, the results for Potassium (K) were 2,592.364 mg/kg, Calcium (Ca) with a yield of 896.033 mg/kg, Iron (Fe) with a total of 174.323 mg/kg and for Zinc ( Zn) of 468.804 mg/kg. In the waters of Serangan, based on the results of absorption measurements from several standard solutions, Potassium (K) obtained results of 2,169,732 mg/kg, Calcium (Ca) with results of 1,677,829 mg/kg, Iron (Fe) with results of 1,669.607 mg /kg and for zinc (Zn) with a yield of 44,090 mg/kg.
Analysis of the Distribution of White Spot Syndrome Virus (WSSV) in Vannamei Shrimp (Litopenaeus vannamei) in Bali: Water Quality and PCR Study Billy Andri Agrifa Barus; Gede Iwan Setiabudi; Hamdanul Fain
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 3 (2025): October 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i03.p09

Abstract

White Spot Syndrome Virus (WSSV) is a pathogen responsible for white spots, typically 0.5–2 mm in diameter, on the shrimp cephalothorax. WSSV is capable of causing mass mortality rates of up to 100% within 3 to 10 days of symptom onset. The rapid transmission and detection challenges associated with WSSV have resulted in significant economic losses for Indonesian shrimp farmers. In Bali, Litopenaeus vannamei (Vannamei shrimp) is the second-largest marine aquaculture commodity after seaweed, with major seed production centered in the Gerokgak and Seririt Districts of Buleleng Regency. Given the difficulty in controlling WSSV, identifying its emergence and characteristics is critical. This study aimed to determine the distribution of WSSV in Bali by examining the relationship between water quality and Polymerase Chain Reaction (PCR) detection results, and by analyzing the correlation between water quality, WSSV incidence, and mortality rates in monitoring ponds. The research focused on PCR analysis and water quality assessment of Vannamei shrimp from the Karangasem, Buleleng, and Jembrana Regencies, conducted by the Indonesian Quarantine Agency (BKI). Water quality parameters, including temperature, transparency, pH, DO, salinity, nitrite, nitrate, ammonia, and phosphate, were measured using test kits. The study detected no WSSV during the examination period. PCR analysis showed amplification products ranging from 200 to 400 bp, distinct from the standard WSSV-positive marker at 941 bp. Furthermore, all water quality samples met the criteria and compliance parameters established by the Animal, Fish, and Plant Quarantine Center (BBKKIT).
Co-Authors Billy Andri Agrifa Barus Gede Iwan Setiabudi Gressty Sari Br Sitepu Kadek Lila Antara Putu Dhena Viyanti Widianita