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All Journal Jurnal Biologi Tropis JURNAL SOSIAL TERAPAN (JSTR)
I Putu Gede Eka Handrayana Putra
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Law, Crime, Criminology & Criminal Justice Social Sciences Other

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Gastropod Community Structure as a Bioindicator of Water Quality n The Seagrass Ecosystem at Samuh Beach, Bali Pratama, Made Dendy; I Putu Gede Eka Handrayana Putra; I Kade Alfian Kusuma Wirayuda
Jurnal Biologi Tropis Vol. 25 No. 3 (2025): Juli-September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i3.9574

Abstract

Coastal ecosystems, such as the seagrass meadows at Samuh Beach, Bali, are vulnerable to anthropogenic pressures from high-intensity tourism. This degradation necessitates effective monitoring tools, and gastropod communities are potential bioindicators due to their sensitivity to environmental change. The objective of this study was to evaluate the gastropod community structure as a bioindicator of water quality within this ecosystem. The study was conducted from November to December 2024 at two stations representing different levels of human activity, using line transects and quadrat sampling. A total of 10 gastropod species were recorded. The community structure was characterized by low species diversity (H' = 1.25), moderate evenness (E = 0.52), and low dominance (C = 0.35). In contrast, all measured water quality parameters were found to be within optimal ranges for marine biota. The dissonance between the low biodiversity and favorable water chemistry suggests that the gastropod community is responding to unmeasured stressors, likely physical disturbances or specific pollutants associated with tourism. This study validates the efficacy of using gastropod assemblages as sensitive bioindicators of ecosystem health, capable of detecting impacts that standard water quality tests may miss. Continuous monitoring is recommended to safeguard the area.
MANAJEMEN POTENSI EKONOMI TUNA MATA BESAR (Thunnus obesus) YANG DIDARATKAN DI PELABUHAN BENOA, BALI I Putu Gede Eka Handrayana Putra; Suprabadevi Ayumayasari Saraswati; Sunzexcri Apri Seven Hutagalung; Revalina Najwa Sunarya; Khofifah Salsabilah; Angel Eka Laurentsia
Jurnal Sosial Terapan Vol 3 No 2 (2025): Jurnal Sosial Terapan, Volume 3 No.2 Desember 2025
Publisher : IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/kes95633

Abstract

Bigeye tuna (Thunnus obesus) is an economically important commodity landed at Benoa Port, yet it currently faces challenges regarding declining catch efficiency and economic value. This study aims to analyze Catch per Unit Effort (CPUE) trends, estimate Maximum Sustainable Yield (MSY), and examine the dynamics of economic production value to determine appropriate management strategies. The research employed a survey method utilizing operational landing time-series data from 2020 to 2024. Data were analyzed using the Gordon-Schaefer model. The results indicated that a surge in fishing effort in 2024, reaching 456 trips, was not commensurate with the catch, causing the CPUE to drop significantly to its lowest value of 2.16 tons/trip. The MSY was estimated at 1,272.12 tons/year with an optimum fishing effort of 489.41 trips/year. Although the resource utilization rate remains in the Moderate Exploited category (77.3%), the fishing effort level has approached a critical point, reaching 93.2% of the optimum limit. Economically, there was a significant decline in production value from IDR 58.1 billion in 2020 to IDR 19.6 billion in 2024, attributed to falling prices and smaller fish sizes. It is concluded that tuna fisheries management in Benoa requires the immediate implementation of fishing effort restrictions and an orientation towards improving catch quality to prevent overfishing and restore economic profitability.
Co-Authors Angel Eka Laurentsia I Kade Alfian Kusuma Wirayuda Khofifah Salsabilah Pratama, Made Dendy Revalina Najwa Sunarya Sunzexcri Apri Seven Hutagalung Suprabadevi Ayumayasari Saraswati