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All Journal Biodiversitas Journal of Biological Diversity
ARIEF SETYANTO
Department of Fisheries, Faculty of Fisheries and Marine Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Coral disease prevalence and compromised health in the Sempu Island Nature Reserve, Malang District, Indonesia ANDIK ISDIANTO; ANGGER RIO FEWILA; SEFTIAWAN SAMSU RIJAL; ARIEF SETYANTO; AULIA LANUDIA FATHAH; DINI ATIKAWATI; BERLANIA MAHARDIKA PUTRI; INTAN DWI PUSPITASARI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 4 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250408

Abstract

Abstract. Isdianto A, Fewila AR, Rijal SS, Setyanto A, Fathah AL, Atikawati D, Putri BM, Puspitasari ID, Luthfi OM. 2024. Coral disease prevalence and compromised health in the Sempu Island Nature Reserve, Malang District, Indonesia. Biodiversitas 25: 1404-1412. Since the Dutch colonialization era, the Malang District's Sempu Strait has been designated a natural reserve. Environmental changes and human activities have contributed to the 14.28% coral cover in the Sempu Strait. This study aims to assess coral health in the Sempu Strait and detect coral diseases or compromised conditions. At five stations, data were gathered utilizing the Underwater Photo Transect method with a 10-meter interval and a 1x1 meter transect implemented across 100 meters. The average coral cover in Sempu Strait is 14.28%, considered inadequate according to categories for determining coral reef status. Fish Bite, Black Band Disease (BBD), Ulcerative White Spots (UWS), Non-Focal Bleaching (NFBL), Trematodiasis, and Pigmentation Response are the six categories of coral reef diseases that have been identified. Sediment damage is the only compromised health condition that has been identified. With an average prevalence of 15.35%, Non-Focal Bleaching (NFBL) is the most prevalent disease; Black Band Disease (BBD) has the lowest prevalence at 0.8%. The insufficient coral coverage in the Strait of Sempu is caused by the surrounding environmental conditions that stress corals to the point where the prevalence of coral-eating diseases is increased.
Assessing the resilience of coral reefs against macroalgae invasion in the Sempu Island Nature Reserve, Malang District, Indonesia ANDIK ISDIANTO; PUTRI DEVI YORARIZKA; DIAN ALIVIYANTI; SYARIFAH HIKMAH JULINDA SARI; ADI TIYA YANUAR; MUHAMMAD ARIF ASADI; ARIEF SETYANTO; GATUT BINTORO; TRI DJOKO LELONO; DINI ATIKAWATI; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 7 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250709

Abstract

Abstract. Isdianto A, Yorarizka PD, Aliviyanti D, Sari SHJ, Yanuar AT, Asadi MA, Setyanto A, Bintoro G, Lelono TD, Atikawati D, Fathah AL, Putri BM, Supriyadi, Luthfi OM. 2024. Assessing the resilience of coral reefs against macroalgae invasion in the Sempu Island Nature Reserve, Malang District, Indonesia. Biodiversitas 25: 2877-2887. The living coral cover in the Sempu Strait is known to be stuck in the range of 37% due to average data from 2009-2016. Several coral diseases have been documented in this region, which can result in the transformation of coral reefs into algae-dominated communities. This study examines the dynamic interplay between coral reefs and macroalgae within the marine ecosystems of the Sempu Island Nature Reserve, Malang District, Indonesia. Conducted across five research stations, our analysis utilized the Underwater Photo Transect (UPT) method, combined with image analysis tools CPCe and Image-J, and statistical analysis through SPSS. The findings indicate a persistent competition between corals and macroalgae, exacerbated by sedimentation from port activities and river discharges, and significant nutrient loads from human settlements. The average living coral coverage varied significantly, with a range from 12% to 53% across the study period, while macroalgae coverage showed an increase, especially in turf algae. The correlation analysis revealed a 'quite strong' relationship (r=0.783 between coral and macroalgae coverage, suggesting that increases in coral cover could potentially facilitate macroalgae proliferation under current environmental conditions. Notably, the study highlighted the critical role of water quality parameters such as temperature, pH, and salinity, which were within optimal ranges yet facilitated competitive interactions. This research underscores the complexity of coral-macroalgae relationships and the pressing need for integrated management strategies focusing on water quality and habitat preservation to ensure the resilience of these critical marine ecosystems.
Evaluating growth and exploitation dynamics of Thunnus albacares for sustainable fisheries in fishery landed in Bali's Benoa Harbor TRI DJOKO LELONO; GATUT BINTORO; ARIEF SETYANTO; DARMAWAN OCKTO SUTJIPTO; AGUS TUMULYADI; WIRASTIKA ADHIHAPSARI; WAHIDA KARTIKA SARI; MIHROBI KHALWATU RIHMI; DIAN ALIVIYANTI; ANDIK ISDIANTO; AGITA DWI ROSMALIA PUTRI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 9 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250905

Abstract

Abstract. Lelono TD, Bintoro G, Setyanto A, Sutjipto DO, Tumulyadi A, Adhihapsari W, Sari WK, Rihmi MK, Aliviyanti D, Isdianto A, Putri ADR. 2024. Evaluating growth and exploitation dynamics of Thunnus albacares for sustainable fisheries in fishery landed in Bali's Benoa Harbor. Biodiversitas 25: 2858-2869. This study aims to analyze the population dynamics of Thunnus albacares (Bonnaterre, 1788), particularly focusing on factors such as length-weight relationships, length frequency distribution, first caught size, gonadal maturity size, growth rate, mortality rate, and exploitation rate. The analysis, conducted using FISAT II software with data from 2018 to February 2022, also includes evaluating fish utilization status. This evaluation involves estimating Allowable Biological Effort (ABE), Allowable Biological Catch (ABC), and Total Allowable Catch (TAC) based on yellowfin tuna (T. albacares) production data from 2012 to 2021 in Bali’s Benoa Harbor. These parameters and analyses are crucial for maintaining the sustainability of catch utilization. This will be achieved using the Feedback Harvest Control Rules (FHCR) with a random sampling method. The length-weight relationship analysis yielded positive allometric growth (b>3), influenced by genetic, environmental, reproductive, and overexploitation factors. The initial catch size value (Lc50%) was determined to be 134.7 cmFL, while the gonadal maturity size (Lm) was estimated to be 103.3 cmFL. Therefore, it is paramount to refrain from fishing before reaching reproductive maturity to ensure the stock's survival. The asymptotic length (L?) was estimated at 235.45 cmFL, t0 -2.91, with a growth rate (K) of 0.20. This indicates a relatively slow growth rate, which is important information for effective fisheries management. The exploitation rate (E) of 0.88 per year indicates overexploitation. Hence, the need for sustainable fishing practices should be noted in certain areas. Applying the FHCR model provides insights into stock estimation and sustainable management strategies that are of value in informing the development of more careful management practices.
Co-Authors ADI TIYA YANUAR AGITA DWI ROSMALIA PUTRI AGUS TUMULYADI ANDIK ISDIANTO ANGGER RIO FEWILA AULIA LANUDIA FATHAH BERLANIA MAHARDIKA PUTRI BERLANIA MAHARDIKA PUTRI DARMAWAN OCKTO SUTJIPTO DIAN ALIVIYANTI DIAN ALIVIYANTI DINI ATIKAWATI DINI ATIKAWATI GATUT BINTORO INTAN DWI PUSPITASARI MIHROBI KHALWATU RIHMI MUHAMMAD ARIF ASADI OKTIYAS MUZAKY LUTHFI PUTRI DEVI YORARIZKA SEFTIAWAN SAMSU RIJAL SUPRIYADI SUPRIYADI SYARIFAH HIKMAH JULINDA SARI TRI DJOKO LELONO WAHIDA KARTIKA SARI WIRASTIKA ADHIHAPSARI