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All Journal Biodiversitas Journal of Biological Diversity
TRI DJOKO LELONO
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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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 ARIEF SETYANTO AULIA LANUDIA FATHAH BERLANIA MAHARDIKA PUTRI DARMAWAN OCKTO SUTJIPTO DIAN ALIVIYANTI DIAN ALIVIYANTI DINI ATIKAWATI GATUT BINTORO MIHROBI KHALWATU RIHMI MUHAMMAD ARIF ASADI OKTIYAS MUZAKY LUTHFI PUTRI DEVI YORARIZKA SUPRIYADI SUPRIYADI SYARIFAH HIKMAH JULINDA SARI WAHIDA KARTIKA SARI WIRASTIKA ADHIHAPSARI