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Struktur komunitas fitoplankton dan kaitannya dengan ketersediaan zat hara dan parameter kualitas air lainnya di perairan Timur Surabaya Setya Indra Padma Putri; Syarifah Hikmah Julinda Sari
Depik Vol 4, No 2 (2015): AUGUST 2015
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.4.2.2455

Abstract. The objetives of the present research were to determine relationship of phytoplankton abundance and community structure with environmental factors.The research was conducted in twelve stations along East Surabaya’s Coastal Waters. The samplings were represented early dry season (May-July 2013). Regression Correlation Analisis and Principle Component Analysis were involved to determine the relationship between community structure of phytoplankton and nutrient availability as well as other environmental parameters. The results showed that the concentration of Nitrate (NO3-N) was ranged from 1.80mg/L to 7.31 mg/L while Phosphate (PO4-P) was 0.20 – 4.75 mg/L. The phytoplankton abundance was varied between 3300 cell/L to 47000 cell/L. The highest phytoplankton abundance was found in the estuary and deacreased toward the sea areas. The dDiversity and evennes indices were low category, while dominance index was found to be relatively high, where Skeletonema sp. was predominant. Diversity index was not correlated significantly with nutrient availability, while there were a significant correlation between phytoplankton abundance and environment parameters namely salinity, DO and brighnessKeywords : phytoplankton abundance; oseanography factor; spatial analysis; coastal watersAbstrak. Penelitian ini bertujuan untuk mengetahui keterkaitan antara kelimpahann dan struktur komunitas fitoplankton dengan faktor lingkungan di perairan pesisir. Penelitian dilakukan pada 12 stasiun berbeda di Perairan Timur Surabaya. Sampling plankton dan kualitas air mewakili awal musim kemarau (Mei – Juli 2013). Analisis regresi korelasi dan analisis komponen utama dilakukan untuk melihat keterkaitan struktur komunitas dan ketersedian zat hara dan parameter lingkungan lainnya di lokasi penelitian. Hasil penelitian menunjukkan kandungan zat hara yang relatif tinggi: Nitrat (NO3-N) antara 1,80 – 7,31 mg/L dan Fosfat (PO4-P) antara 0,20 – 4,75 mg/L. Distribusi fitoplankton bervariasi antara 3,3 – 4,7.103sel/L. Kelimpahan plankton paling tinggi didapat pada stasiun muara sungai dengan indikasi penurunan ke arah laut. Indeks keragaman jenis (H’) dan indeks keseragaman jenis (E) relatif rendah; sebaliknya indeks dominasi tinggi (D0,5) dengan didominasi oleh Skeletonema sp.. Indeks diversitas menunjukkan hubungan yang tidak bermakna dengan zat hara. Namun, kelimpahan fitoplankton berkorelasi secara signifikan dengan parameter salinitas, DO dan kecerahan.Kata kunci :kelimpahan fitoplankton; faktor oseanografi; analisis spasial; perairan pesisir

Struktur komunitas fitoplankton dan kaitannya dengan ketersediaan zat hara dan parameter kualitas air lainnya di perairan Timur Surabaya Setya Indra Padma Putri; Syarifah Hikmah Julinda Sari
Depik Vol 4, No 2 (2015): AUGUST 2015
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.4.2.2455

Abstract. The objetives of the present research were to determine relationship of phytoplankton abundance and community structure with environmental factors.The research was conducted in twelve stations along East Surabaya’s Coastal Waters. The samplings were represented early dry season (May-July 2013). Regression Correlation Analisis and Principle Component Analysis were involved to determine the relationship between community structure of phytoplankton and nutrient availability as well as other environmental parameters. The results showed that the concentration of Nitrate (NO3-N) was ranged from 1.80mg/L to 7.31 mg/L while Phosphate (PO4-P) was 0.20 – 4.75 mg/L. The phytoplankton abundance was varied between 3300 cell/L to 47000 cell/L. The highest phytoplankton abundance was found in the estuary and deacreased toward the sea areas. The dDiversity and evennes indices were low category, while dominance index was found to be relatively high, where Skeletonema sp. was predominant. Diversity index was not correlated significantly with nutrient availability, while there were a significant correlation between phytoplankton abundance and environment parameters namely salinity, DO and brighnessKeywords : phytoplankton abundance; oseanography factor; spatial analysis; coastal watersAbstrak. Penelitian ini bertujuan untuk mengetahui keterkaitan antara kelimpahann dan struktur komunitas fitoplankton dengan faktor lingkungan di perairan pesisir. Penelitian dilakukan pada 12 stasiun berbeda di Perairan Timur Surabaya. Sampling plankton dan kualitas air mewakili awal musim kemarau (Mei – Juli 2013). Analisis regresi korelasi dan analisis komponen utama dilakukan untuk melihat keterkaitan struktur komunitas dan ketersedian zat hara dan parameter lingkungan lainnya di lokasi penelitian. Hasil penelitian menunjukkan kandungan zat hara yang relatif tinggi: Nitrat (NO3-N) antara 1,80 – 7,31 mg/L dan Fosfat (PO4-P) antara 0,20 – 4,75 mg/L. Distribusi fitoplankton bervariasi antara 3,3 – 4,7.103sel/L. Kelimpahan plankton paling tinggi didapat pada stasiun muara sungai dengan indikasi penurunan ke arah laut. Indeks keragaman jenis (H’) dan indeks keseragaman jenis (E) relatif rendah; sebaliknya indeks dominasi tinggi (D0,5) dengan didominasi oleh Skeletonema sp.. Indeks diversitas menunjukkan hubungan yang tidak bermakna dengan zat hara. Namun, kelimpahan fitoplankton berkorelasi secara signifikan dengan parameter salinitas, DO dan kecerahan.Kata kunci :kelimpahan fitoplankton; faktor oseanografi; analisis spasial; perairan pesisir

Spatial Distribution and Contamination Assessment of Lead (Pb) in the Seawater and Surface Sediments of the Coastal Area of Prigi Bay, Trenggalek, East Java Defri Yona; David Vernandes; Rarasrum Dyah Kasitowati; Syarifah Hikmah Julinda Sari
Jurnal Ilmiah Perikanan dan Kelautan Vol. 12 No. 1 (2020): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v12i1.16673

HighlightsConcentration of lead (Pb) in the surface water and sediment were analyzedThe ecological risks of metal in the ecosystem were assessedPb concentration in the surface water and sediment were observed in the similar range Pb in the study areas has low ecological risk indexConcern on Pb contamination in Prigi Harbor is neededAbstractThis study attempts to measure the spatial distribution of Pb in the seawater and surface sediments and to analyze its potential harmful effect in the surface sediments of the coastal areas of Prigi Bay, Trenggalek. Prigi Bay has been considered as one of the harbors with substantial activities from fisheries, tourism, and domestic events in Indonesia. These activities may discharge heavy metals, e.g., lead (Pb) into the environment and bring hazard to animal and human life. Data for Pb concentrations were collected from two stations near Prigi Harbor (Stations 1 and 2), one station in the Prigi Beach (Station 3) and two stations near the river mouths (Stations 4 and 5). Water quality parameters (temperature, salinity, pH, and DO) were also measured. Stations 1 and 4 displayed a higher concentration of Pb in the seawater than in the surface sediments. On the other hand, Stations 3 and 5 showed a higher concentration of Pb in the surface sediments than in the seawater. Pb concentration in the seawater was 0.22-0.60 mg/kg, and in the surface, sediments were in the range of 0.40-0.57 mg/kg. According to the analysis of contamination factor (CF), the study sites have a low degree of contamination from heavy metal Pb (CF < 1). The result was also supported by the potential toxicity of Pb to the benthic environment around Prigi Bay that was still considered low (E < 40). In spite of the low degree of contamination and low potential toxicity from Pb, concern regarding the heavy metal pollution in the study areas is still needed due to substantial activities that can contribute to the accumulation of heavy metal in a long time.

Bioaccumulation and Health Risk Assessments of Heavy Metals in Mussels Collected from Madura Strait, Indonesia Defri Yona; Aida Sartimbul; Muhammad Arif Rahman; Syarifah Hikmah Julinda Sari; Priyanka Mondal; Abdullah Hamid; Tsania Humairoh
Jurnal Ilmiah Perikanan dan Kelautan Vol. 13 No. 1 (2021): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v13i1.24677

HighlightHeavy metals (Cu, Zn, Pb, and Cd) in the seawater, sediment, and soft part of marine mussels were analyzedBioaccumulation Factor (BAF), Estimated Daily Intake and Target Hazard Quotient (THQ) were calculatedHeavy metals in the seawater, sediment and marine mussels were found in varying concentrationsHealth risk assessment indexes showed low values which means insignificant health hazardAbstractMarine mussels are known as one of the biological indicators of heavy metals pollution in the aquatic environment and the sources of protein for human consumption. This study aimed to investigate the concentration of heavy metals (Cu, Zn, Pb, and Cd) in the seawater, sediment, and soft parts of the marine mussels (Perna viridis, Meretrix sp., and Anadara granosa), as well as to evaluate its health risk of consumption from Madura Strait, Indonesia. The seawater, sediment, and marine mussels were obtained from four sites and heavy metal concentrations were analyzed using Atomic Absorption Spectroscopy. In the seawater, heavy metals were in the order of Cu, Pb, Cd, and Zn from the highest to the lowest concentration respectively, while they went down in the order of Zn, Cu, Pb, and Cd in the sediment respectively. Excluding the Pb, higher Cu and Zn concentrations were observed in marine mussels than in seawater and sediments (BAF> 1). Furthermore, it was proven that Cu and Zn were considered as essential metals and required for metabolism, while Pb and Cd were non-essential metals which their biological functions were unknown. The Estimated Daily Intake (EDI) of the marine mussels was lower than the oral reference dose (ORD) and low values of target hazard quotient (THQ < 1) had shown that the consumption of mussels containing heavy metals would not cause significant health risks to humans. The health risk assessment indexes showed low values, which meant insignificant health hazard. However, long-term exposure and the impact of consuming mussels containing heavy metals may require additional investigation

Perbandingan Larutan NaCl dan K2CO3 Sebagai Media Pemisahan Densitas Mikroplastik Pada Sedimen Pantai Kondang Merak dan Pantai Goa Cina Galuh Dyah Pitaloka Hayyu; Dwi Nurjanatin Arifianti; Defri Yona; Feni Iranawati; Syarifah Hikmah Julinda Sari
Jurnal Kelautan Vol 17, No 1: April (2024)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v17i1.21898

ABSTRAKSalah satu tahapan dalam analisis mikroplastik adalah proses pemisahan partikel mikroplastik dari sampel untuk memudahkan proses identifikasi. Pada penelitian ini digunakan larutan NaCl dan K2CO3 yang memiliki densitas berbeda, yaitu masing-masing 1,18 g/cm3 dan 1,43 g/cm3. Larutan NaCl dan K2CO3 memiliki densitas yang lebih tinggi daripada rata-rata mikroplastik yang ditemukan (0.9-1.4 g/cm3), oleh karena itu kedua larutan ini dipilih dalam proses pemisahan densitas. Sampel yang digunakan adalah sampel sedimen Pantai Goa Cina dan Pantai Kondang Merak. Kedua pantai ini dipilih sebagai lokasi pengambilan sampel karena reputasinya sebagai pantai wisata dan berpotensi terhadap pencemaran mikroplastik. Tujuan penelitian ini adalah untuk membandingkan efektivitas penggunaan larutan NaCl dan K2CO3 dalam proses pemisahan densitas mikroplastik serta menganalisis hasil persentase jenis mikroplastik yang ditemukan. Secara keseluruhan terdapat 11 sampel yang terdiri dari lima sampel sedimen dari pantai Goa Cina dan enam sampel sedimen dari Pantai Kondang Merak. Sampel kemudian dikeringkan dan direndam pada masing-masing larutan NaCl dan K2CO3. Supernatant yang terbentuk dalam proses ekstraksi kemudian disaring menggunakan vacuum pump dan kertas whatman untuk diamati partikel mikroplastiknya menggunakan mikroskop. Kedua pantai menunjukkan hasil yang serupa, yaitu didominasi oleh mikroplastik berbentuk fiber. Hasil ekstraksi dengan menggunakan K2CO3 menunjukkan lebih banyak fragmen yang ditemukan dibandingkan dengan hasil ekstraksi dengan menggunakan NaCl. Mikroplastik dalam bentuk pellet hanya ditemukan pada ekstraksi menggunakan larutan K2CO3 pada sampel sedimen Pantai Kondang Merak. K2CO3 lebih mahal daripada NaCl, namun hasil ekstraksi menunjukkan bahwa mikroplastik yang terekstraksi dengan K2CO3 lebih banyak dibandingkan yang terekstraksi dengan NaCl. Kata Kunci: Densitas, Fiber, Fragmen, Pencemaran, WisataABSTRACTOne of the stages in microplastic analysis is the process of separating microplastic particles from the sample to facilitate the identification process. This study used NaCl and K2CO3 solutions used with the density of 1.18 g/cm3 and 1.43 g/cm3 respectively. NaCl and K2CO3 solutions have higher densities than the average microplastics (0.9-1.4 g/cm3) therefore these two solutions were used in the density separation process. The samples used were sediments from Goa Cina Beach and Kondang Merak Beach. Both beaches were chosen as sampling locations because of the reputation of their beauty which make it popular tourist destination. This study will serve as a reference to investigate the abundance of microplastics in the tourist beach of Malang. The purpose of this study is to compare the use of NaCl and K2CO3 solutions in the density separation process, starting from the cost required, materials needed, and the extraction results. Five samples were taken from Goa Cina beach and six samples from Kondang Merak Beach. The sediment samples taken then dried and immersed in the extraction solution, the supernatant formed in the extraction process was then filtered using a vacuum pump and wattman paper to be observed using a microscope. Both beaches showed similar results with fiber-shaped microplastics being the most common. The results of extraction using K2CO3 showed that more fragments were found than the results of extraction using NaCl. Microplastics in the form of pellets were only found in the extraction using K2CO3 solution in Kondang Merak Beach sediment samples. The price of K2CO3 is more expensive than NaCl, but the extraction results showed that microplastics extracted with K2CO3 are more abundant than those extracted with NaCl.Keywords: Density, Fiber, Fragment, Pollution, Tourism

Karakteristik Arus Permukaan Laut pada Selat Madura: Characteristics of Sea Surface Current in Madura Strait Dumatubun, Innocentius Arya Panji Pramudewata; Widodo Setiyo Pranowo; Aida Sartimbul; Johar Setiyadi; Syarifah Hikmah Julinda Sari; Fahreza Okta Setyawan
Jurnal Chart Datum Vol. 10 No. 1 (2024): Jurnal Chart Datum
Publisher : Sekolah Tinggi Teknologi Angkatan Laut (STTAL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37875/chartdatum.v10i1.325

Selat Madura merupakan perairan yang memisahkan antara Pulau Jawa dengan Pulau Madura yang memiliki ciri yaitu relatif dangkal dan perairan semi tertutup. Sehingga pola pergerakan arus di Selat Madura mendapatkan pengaruh dari sistem angin muson di Indonesia yang berbeda tiap musimnya dan pergerakan massa air dari Laut Jawa dan Laut Bali bertemu di Selat Madura. Data arus permukaan didapatkan dari Marine Copernicus yang kemudian divisualisasikan dan dianalisis menggunakan perangkat lunak Ocean Data View (ODV). Hasil penelitian menunjukan bahwa kecepatan dan arah arus permukaan laut di Selat Madura beragam tiap musimnya. Ketika Musim Barat, pergerakan massa air mayoritas datangnya dari Laut Jawa dengan kecepatan kemudian berbelok masuk ke Selat Madura begitu sebaliknya yang terjadi saat Musim Timur. Rata-rata kecepatan arus berdasarkan area kajian dimana pada Utara Selat Madura (III) memiliki kecepatan sebesar 0,06-0,41 m/s. Area kajian tepat pada Selat Madura (I dan II) memiliki rata-rata kecepatan yang terbilang rendah dengan nilai berkisar 0,03-0,15 m/s. Hal tersebut dikarenakan perairan Selat Madura merupakan perairan semi-tertutup sehingga angin yang bertiup di atas permukaan laut tidak konstan.

Studi Eksperimen Indeks El Niño Southern Oscillation & Indian Ocean Dipole di Indonesia dengan Memanfaatkan Oceanic Niño Index dan Dipole Mode Index (Studi Kasus: Tahun 2009 – 2020): Experimental Study Of The Coupling Between The El Niño Southern Oscillation Index and The Indian Ocean Dipole in Indonesia Utilizing The Oceanic Niño Index and Dipole Mode Index (Case Study: 2009 – 2020) Krisnanto, Wahyu Fajar; Sartimbul, Aida; Pranowo, Widodo Setiyo; Sari, Syarifah Hikmah Julinda; Setyawan, Fahreza Okta
Jurnal Chart Datum Vol. 10 No. 1 (2024): Jurnal Chart Datum
Publisher : Sekolah Tinggi Teknologi Angkatan Laut (STTAL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37875/chartdatum.v10i1.332

Interaksi antara laut dan atmosfer Benua Maritim Indonesia dengan kondisi yang terjadi pada Samudera Pasifik dan Hindia adalah sangat kuat. Fenomena yang sangat mempengaruhi Indonesia diantaranya adalah El Nino Southern Oscillation (ENSO) dan Indian Ocean Dipole (IOD). Indeks yang digunakan, secara teoritik, untuk menyatakan fase ENSO dan IOD sangat beragam, seperti DMI, Nino 3.4, ONI, dan sebagainya. Artikel ini menyajikan studi eksperimental tentang kopling Indeks antara ONI, DMI dan SPL. Data yang digunakan dalam penelitian ini adalah data bulanan SPL Indonesia yang diambil dari situs NASA Oceancolor, data indeks ONI dan DMI yang diambil dari situs NOAA, dan peta SPL dan angin ekuatorial yang disediakan oleh situs IRI. Hasil riset menunjukkan bahwa saat fase El Niño/IOD positif, angin dan massa air hangat bergerak menjauhi Indonesia pada kedua samudera. Sedangkan pada fase La Niña/IOD negatif terjadi hal sebaliknya. Ada dua teori yang bisa mendeskripsikan korelasi ENSO dengan IOD, pertama ENSO dapat mempengaruhi keberadaan IOD serta intensitasnya. kedua IOD dapat terbentuk dengan sendirinya tanpa ada pengaruh dari aktivitas ENSO. Indeks baru berupa modifikasi yang didapatkan menggunakan metode korelasi, pada eksperimen ini, belum bisa digunakan untuk menentukan fase ENSO dan IOD. Namun, hasil eksperimen berupa kopling indeks menggunakan metode anomali memiliki hasil menjanjikan untuk digunakan dalam penentuan fase ENSO dan IOD untuk wilayah Indonesia, walaupun perlu dilakukan studi lebih lanjut dengan dengan data yang lebih panjang.

EFFECTIVITY OF BIOACCUMULATION AND TRANSLOCATION OF HEAVY METALS (CD, ZN, AND PB) IN AVICENNIA MARINA GROWING AT WONOREJO MANGROVE ECOSYSTEM, EAST SURABAYA Sari, Syarifah Hikmah Julinda; Yona, Defri; Vidayanti, Viky; Ramadhan, Firman
Journal of Environmental Engineering and Sustainable Technology Vol 10, No 02 (2023)
Publisher : Directorate of Research and Community Service (DRPM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jeest.2023.010.02.7

Avicennia marina is a species of mangrove that has been studied extensively for its capability to uptake and accumulate heavy metals. Since Avicennia marina was found in the Wonorejo Mangrove ecosystem, which confirmed received anthropogenic inputs from Surabaya as the second largest city in Indonesia, the effectivity of bioaccumulation and translocation metals Cd, Zn, and Pb was studied. The sediments, roots, stems and leaves of Avicennia marina were collected in three sites in Wonorejo Mangrove Ecosystem, East Surabaya. The measurement of Cd, Zn and Pb was conducted by ICP-MS. To assess the effectiveness of accumulation and translocation capability, Bioconcentration Factor (BCF) and Translocation Factor (TF) were calculated. The results showed that the distribution of heavy metals Cd and Pb in the organs of the mangrove Avicennia marina exhibited distinct patterns. Although both of them are considered as non-essential elements, Cd tends to distribute evenly until leaves parts, while Pb tends to retain in the roots. In the case of Zn, as an essential element, the uptake was more intense compared to non-essential elements and mobilized until the leaves parts. Interestingly, once all metals reach the stem, they might transfer to the leaves as shown by TF values more than 1. Therefore, Avicennia marine has an effective defense mechanism in the presence of metals by regulating the accumulation and translocation of metals into detoxifying organs.

Composition of Marine Debris on The Coast of Banyuwangi, East Java Arifianti, Dwi Nurjanatin; Yona, Defri; Sari, Syarifah Hikmah Julinda
Journal of Marine and Coastal Science Vol. 13 No. 3 (2024): SEPTEMBER
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v13i3.59631

Marine debris has emerged as a significant environmental issue of growing global concern, closely linked to pollution and its impact on the environment. Understanding the distribution of marine waste in coastal areas is crucial, especially considering that beaches are key sites for various human activities such as tourism, fishing, and shipping. To address this, a study was conducted to analyze the composition of marine debris on three beaches in Banyuwangi Regency, East Java. The study took place in July and August of 2023, focusing on Boom, Cacalan, and Cemara beaches. Marine debris was collected along the coastline in 5 x 5 m transects, spaced 20 m apart, to identify and quantify the types of waste. The findings revealed that Boom Beach had the highest percentage of rubbish (46%), followed by Cemara Beach (30%) and Cacalan Beach (24%). Additionally, the highest abundance of rubbish per area was found at Boom Beach (5.97 ± 16.64 item/m2), Cemara Beach (3,92 ± 11,36 item/m2), and Cacalan Beach (3,12 ± 5,27 item/m2). Boom Beach and Cemara Beach were primarily dominated by plastic waste, while at Cacalan Beach, plastic waste and broken glass were found in nearly equal proportions. The calculation of the Clean Coast Index (CCI) indicated that all three beaches were significantly polluted. As a result, there is a clear need for focused attention on waste management at tourist beaches to preserve the aesthetics and comfort of beach visitors.

Analisis Perbandingan Sampah Laut Jenis Plastik dan Non-Plastik di Pulau Gili Ketapang, Probolinggo, Jawa Timur Sari, Syarifah Hikmah Julinda; Yona, Defri; Saputra, Dhira Kurniawan; Rumantya, Matthew Adi Bekti
Jurnal Laot Ilmu Kelautan Vol 6, No 2 (2024): Jurnal Laot Ilmu Kelautan
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jlik.v6i2.10684

Penelitian ini bertujuan menganalisis perbandingan sampah laut jenis plastik dan jenis non-plastik yang ditemukan di sepanjang pantai Pulau Gili Ketapang, Kabupaten Probolinggo, Jawa Timur. Penelitian dilaksanakan pada bulan Juni 2024 dengan dua kali pengulangan. Stasiun ditentukan berdasarkan aktivitas antropogeniknya yaitu stasiun wisata bagian barat (WB), dermaga bagian utara (DU), dermaga bagian selatan (DS), area bagian timur laut (TL), Pantai Goa Kucing (PGK), dan area bagian barat selatan (BS). Transek garis ditempatkan sepanjang 100 m garis pantai , dan setiap 20 m ditempatkan transek kuadrat berukuran 5 x 5 m, kecuali pada stasiun DS berukuran 1x 1 m. Sampah laut jenis plastik dan non-plastik yang ditemukan dicatat jumlah, ukuran (makro kecil dan makro besar) dan jenisnya. Hasil penelitian menunjukkan kepadatan sampah laut jenis plastik sebesar 14,89 item/m2 dan jenis non-plastik sebesar 5,22 item/m2. Persentase sampah plastik tertinggi ditemukan pada stasiun dermaga utara (DU) dan stasiun dermaga Selatan (DS) dengan kisaran 75-77 %. Sebesar > 86 % ditemukan jenis sampah plastik sekali pakai di semua stasiun penelitian. Dilihat pada ukurannya, kedua jenis sampah laut tersebut didominasi dengan ukuran sampah makro kecil atau 2,5 – 30 cm. Penelitian ini menunjukkan sampah plastik masih menjadi masalah utama di Pulau Gili Ketapang sehingga diperlukan adanya manajemen pengelolaan sampah.

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