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Arum Pratiwi
Universitas Muhammadiyah Surakarta
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Seasonal Ecological Stress Assessment of Selorejo Tropical Reservoir, Indonesia Firdaus, Veterina Azahra; Maimunah, Yunita; Rahardjo, Seto Sugianto Prabowo; Charoendee, Wiracha; Rahmawati, Aulia; Muchlis, Andi Mi'rajusysyakur; Nikhlani, Andi; Pratiwi, Arum
Jurnal Ilmiah Perikanan dan Kelautan 2026: IN PRESS ISSUE (JUST ACCEPTED MANUSCRIPT, 2026)
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

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Abstract

Graphical Abstract Highlight Research 1. Selorejo Reservoir shows chronic ecological stress, with instability strongly amplified during the dry season 2. O2 balance remained persistently negative, indicating that TOD frequently exceeded O2 supply. 3. Phosphorus enrichment and P-limited stoichiometry (N:P > 20) promoted eutrophication risk and cyanobacteria dominance. 4. An integrated framework (WQI–nutrients–oxygen–biology) provides a policy-ready basis for seasonally adaptive reservoir aquaculture management.   Abstract Selorejo Reservoir is a multipurpose tropical reservoir increasingly exposed to eutrophication and seasonal oxygen stress, which may undermine ecological stability and limit sustainable aquaculture. To assess the ecological status and quantify its seasonal ecological carrying capacity for aquaculture using integrated nutrient, oxygen, and biological indicators. Seasonal monitoring was conducted from 2022 to 2024 by measuring temperature, pH, DO, BOD, COD, ammonia, nitrite, nitrate, and phosphate. Ecological stress was evaluated using a water quality index (WQI), ecological balance index (EBI), biodegradability index, nutrient stoichiometry, plankton community structure, and phosphorus loading and O2 balance (TOD-based). WQI classified the reservoir as suitable to highly suitable; however, ecological indicators consistently revealed chronic stress. DO frequently approached low levels (4.3–6.7 mg/L) under high organic demand (BOD 5.53–7.48 mg/L; COD 23.08–26.80 mg/L), while phosphate enrichment (0.009–0.422 mg/L) indicated eutrophic to hypereutrophic conditions. N:P ratios were highly variable (10.4–543.3) but mostly >20, suggesting phosphorus-limited yet bloom-prone dynamics. O2 balance remained persistently negative (−2.97 to −6.74 mg/L), EBI was dominated by at risk to exceeded categories, and plankton composition shifted toward strong cyanobacteria dominance in midstream–downstream zones. Selorejo Reservoir has a narrow seasonal ecological tolerance, with the dry season representing the highest-risk period. Sustainable management requires seasonal regulation of cage culture, improved feed efficiency, and watershed phosphorus control; future studies should quantify external nutrient loading and test mitigation scenarios.
Co-Authors Abi Muhlisin Adam Zegy Herlambang Putra Agus Sudaryanto Agustaria Budi Nugroho Agustina Ika Wulandari Akbar, Faliza Aidul Alfianti, Ade Leta Aliya, Rita Ambarwati, Okki Chandra An Nuuru, Hakim Rasyid Ana Oktarisa Andi Nikhlani Andriyani, Selvya Hesti Arief Wahyudi Jadmiko Arif Widodo Ariyanto, Fajar Aryasatya Cahya Wiyoga Athallah, Ilham Iqbal Aulia Rahmawati, Aulia Budi Kristanto Charoendee, Wiracha Danisa Bella Syaharani Devita Maharani Dian Hudiyawati Dimas Ria Angga Pribadi Dina Mayasari Dina Mayasari, Dina Dwi Ari, Purwaningtyas Lisa E. R. N, Hidayati, Eka Mutya Eka Nurhayati Enita Dewi Farid, Abdul Firdaus, Veterina Azahra Fitri, Aan Dwi Auliya Ganesa Gita Ayu Cahyani Hamyana Hari Kusnanto Hastara Dewi, Kenwi Hastono, Heru Puji Hemi Nursita Hudiawati, Dian Intan Roesyati Juli Muhamad Kartiko Jumali Jumali Kartiko, Juli Muhamad Kartinah Laksono Trisnantoro Lidiana, Exda Hanung maharani, arlin oktavika Maharani, Devita MH Dwi Nur Arif Muchlis, Andi Mi'rajusysyakur Muhammad Afandi Mulyono Mulyono Noor Alis Setiyadi Nugroho, Rino Ardhian Nurlaila Fitriani Nurlaila Fitriani nurmalasari, khani Nursita, Hemi P, Lita Hardyati Panggah Widodo Parjiyana Parjiyana Parjiyana Parjiyana, Parjiyana Raden Mohamad Herdian Bhakti Rahardjo, Seto Sugianto Prabowo Reni Kartika Sari Riswaka Sudjaswadi Rita Tri Subekti Rochmad - S. Sugiharto Sahuri Teguh kurniawan, Sahuri Teguh Saikhu, M. Saraswati, Kristanti Indah Selvya Hesti Andriyani Selvya Hesti Andriyani Setyorini, Fitri Ariani Shelvy Setyawati Sri Lestari Sri Mulyani Suasa Sugiharto Sujiyanti, Sujiyanti Sukotjo, Ivanda Andinar Sulastri Suryadi, Tatang Susilowati, Arlyn Dewi Syamsul Arifin Tiffany, Egidia Ulfah Nur Hanifah Umi Budi Rahayu Wahyudi, Chandra Tri Winarti, Wiwin Wisardoyo Wisardoyo Wulandari, Niken Yuni Yuli Novitasari Yunita Maimunah