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All Journal Jurnal Fisika Unand Indonesian Aquaculture Journal Makara Journal of Science Aceh International Journal of Science and Technology JURNAL REKAYASA KIMIA & LINGKUNGAN
Koko Ondara, Koko
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics

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The Influence of Nutrient (N and P) Enrichment and Ratios on Phytoplankton Abundance in Keunekai Waters, WehIsland, Indonesia Wisha, Ulung Jantama; Ondara, Koko; Ilham, Ilham
Makara Journal of Science Vol. 22, No. 4
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Keunekai waters around Weh Island, Indonesia, have become a prone coastal area because of degradation from climate anomalies and anthropogenic pressure. The high level of coral mortality caused by mass bleaching and fish bombing several years ago may have led to the deterioration of the water conditions and the disruption of the biogeo-chemical cycle, resulting in potential nutrient enrichment and algae blooms (eutrophication). This study aimed to de-termine the influence of nutrient ratios on phytoplankton abundance and monitor the existing waterconditions aroundKeunekai. Spectrophotometry analysis was used to determine the concentrations of the nutrients, and the Sedgewick-Rafter counting method was used to identify the species and abundance of the phytoplankton. A large variation in N content (ranging from 1.1 to 1.6 mg N/L) and, particularly, P content (ranging from 0.02 to 0.18 mg P/L) most likely reflected differences in the supply ratios of N and P, rather than differences in absolute N and P availability. Three taxa of phytoplankton and their relative abundance were identified in the study area: Bacillariophyceae (diatom) (72%), Cyanophyceae (3%), and Dinoflagellate (25%). It was found that P-limitation mostly controls potential algae blooms, which support the density of Dinoflagellates thatmay endanger the water.
LAND SUITABILITY MODELING FOR FISHERY RESOURCE ENHANCEMENT IN THE PADANG PARIAMAN REGENCY, WEST SUMATERA, INDONESIA: GIS AND MULTI-CRITERIA EVALUATION APPROACHES Gemilang, Wisnu Arya; Wisha, Ulung Jantama; Rahmawan, Guntur Adhi; Ondara, Koko; Dhiauddin, Ruzana
Indonesian Aquaculture Journal Vol 19, No 1 (2024): (June, 2024)
Publisher : Agency for Marine and Fisheries Extension and Human Resources

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/iaj.19.1.2024.75-85

Abstract

[Land Suitability Modeling for Fishery Resource Enhancement in the Padang Pariaman Regency, West Sumatera, Indonesia: GIS and Multi-Criteria Evaluation Approaches] Land suitability analysis is required for successful aquaculture planning. Due to the geographical setting of the Padang Pariaman Regency, aquaculture development is likely hindered by the vulnerable coastal area. Suitability assessment of aquaculture projects is crucial to specify the best method espousing sustainable development in the study area. This study aims to select the most proper location to be developed as a center of shrimp aquaculture in the Padang Pariaman Regency. This study employed the multi-criteria decision-making (MCDM), and analytical hierarchy process (AHP) approaches. This study combined the GIS-based analysis, AHP, and MCDM to yield the most proper location for aquaculture development. The three sub-models (engineering, water quality, and infrastructure) are overlaid using the weighted linear combination (WLC) technique. The infrastructure sub-model resulted in the highest coverage of highly suitable criteria with 61.74%. By contrast, the highest percentage of the unsuitable category was found in the water quality sub-model with 17.67%. Of particular concern, 87.5 % of the study area is suitable for aquaculture development. The remaining region is categorized as highly suitable with 11.93%, found in the eastern Padang Pariaman. Thus, we conclude that developing shrimp aquaculture in the study area is possible. Still, the future environmental impacts should be considered beforehand.
Marine Debris of Northern Aceh Waters During First Monsoon Transition Period Agustina, Sri; Karina, Sofyatuddin; Purnawan, Syahrul; Ondara, Koko
Aceh International Journal of Science and Technology Vol 13, No 3 (2024): December 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.3.34234

Abstract

Pollution in the ocean caused by anthropogenic activities has been a global issue. However, data on marine debris in Aceh Waters is limited. This study was conducted to identify the category, density, and source of marine debris on the Weh Island and Aceh Island beaches during the first monsoon transition period. Samples were collected in April 2022 at four stations, namely Laweung Beach in Sumatra Island (station 1), Aron Beach in Weh Island (Station 2), Nipah Beach and Alue Riyeung Beach in Aceh Island (Station 3 and Station 4, respectively). Samples collected in a 100 m-length transect were classified into nine categories: plastic, foamed plastic, cloth, glass and ceramic, metal, paper and cupboard, rubber, wood, and others. The result depicted that the highest density was plastic (0.602-1.022 items/m2), followed by foamed plastic (0.038 to 0.654 items/m2) and rubber (0.020 to 0.089 items/m2). Turning to its appliances, plastic was mostly used as packaging, such as bottles and cups for drinking water, while foamed plastic and rubber were used for cooling boxes and footwear. As the sea current shifted during the monsoon transition period, trash from ships passing the marine routes around the Aceh Waters is assumed to be transporting debris from various countries, such as Malaysia, Thailand, and China.
Using Pollution Index to determine water quality in Banda Aceh waters, Indonesia ondara, Koko; Wisha, Ulung Jantama; Agustina, Sri; Atmadipoera, Agus saleh; Purnawan, Syahrul
Jurnal Rekayasa Kimia & Lingkungan Vol 17, No 1 (2022): Jurnal Rekayasa Kimia & Lingkungan (June, 2022)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v17i1.25155

Abstract

The northern waters of Banda Aceh are connected with the Indian Ocean, the Andaman Sea, and the Malacca Strait, thus making the study of water quality parameters in this region is important for enviromental management. In this study, water quality parameters are measured spatially and then continued with assessing the pollution index. The results can be helpful for development planning and coastal pollution mitigation in Banda Aceh. The data was collected from 21 seawater samples from 11 stations representing the water of Banda Aceh on 10-11 September 2019. VanDorn bottles were used to store the seawater samples for laboratory analysis. Several parameters such as temperature, salinity, and pH were measured in situ, while other parameters were tested in the laboratory. Most heavy metal parameters showed values below the minimal and maximal value limit detection of the instrument, indicating a small potential for heavy metal contamination. However, the pollution index (PI) indicates the potential for water pollution dominated by nitrate and phosphate with a value that exceeds the water quality standard. The indications are shown from the high aquaculture and anthropogenic activities around the coast of Banda Aceh.
Analisis Hindcasting Gelombang Terhadap Perubahan Garis Pantai di Perairan Pesisir Pantai Padang Menggunakan Data Angin Permukaan Indriani, Widi Satria; Pujiastuti, Dwi; Ondara, Koko
Jurnal Fisika Unand Vol 11 No 3 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.11.3.334-340.2022

Abstract

Penelitian ini bertujuan untuk menganalisis gelombang pecah dan mengetahui perubahan garis pantai di sepanjang Pantai Padang, Kecamatan Padang Barat, Kota Padang. Metode yang digunakan berdasarkan data angin di masa lampau (hindcasting) yaitu menggunakan data angin 10 tahun (2010-2019) yang diperoleh dari Stasiun Meteorologi Maritim Teluk Bayur untuk mendapatkan tinggi dan periode gelombang yang signifikan. Untuk mengetahui perubahan garis pantai yang terjadi digunakan metode tumpang susun (overlay) citra satelit Landsat 5 TM tahun 2011 dan Landsat 8 OLI/TIRS tahun 2019, kemudian dianalisis menggunakan metode Digital Shoreline Analysis System (DSAS) untuk menghitung laju perubahan garis Pantai Padang. Hasil penelitian menunjukkan gelombang di perairan Pantai Padang didominasi oleh gelombang dari arah Barat Daya dengan tinggi gelombang 1,58 m dan periode gelombang 5,27 s. Tinggi gelombang pecah yang diperoleh adalah 1,1 m dan pecah pada kedalaman 3 m dari bibr pantai. Gelombang pecah yang terjadi secara terus menerus menyebabkan garis Pantai Padang mengalami kemunduran (abrasi) dengan laju abrasi 3,50 m/tahun. Abrasi terbesar terletak di daerah Muaro Lasak, Purus. Penumpukan-penumpukan sedimen yang dibawa oleh gelombang dan kembali ke pantai menyebabkan terjadinya akresi (penumpukan sedimen) dengan laju akresi sebesar 3,89 m/tahun. Akresi terbesar terletak di belakang Hotel Pangeran Beach, Rimbo Kaluang.
Co-Authors Agus Atmadipoera Dhiauddin, Ruzana Dwi Pujiastuti Guntur Adhi Rahmawan, Guntur Adhi Ilham Ilham Indriani, Widi Satria Sofyatuddin Karina Sri Agustina, Sri Syahrul Purnawan Ulung Jantama Wisha Wisnu Arya Gemilang, Wisnu Arya