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Jurnal Kelautan Tropis
Published by Universitas Diponegoro
ISSN : 14108852     EISSN : 25283111     DOI : -
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Articles 451 Documents
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Analisis Kualitas Perairan Bolaang Mongondow, Sulawesi Utara Berdasarkan Parameter Fisika-Kimia Air Laut Simon I. Patty; Fione Yukita Yalindua; Putri Sapira Ibrahim
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.7596

Abstract

Bolaang Mongondow waters in North Sulawesi is very important estuarine waters due to both land and ocean influenced oceanographic conditions. Observations of water quality along Bolaang Mongondow coast-line have been carried out in February 2019. This study aim to analyze the quality of sea water based on the physico-chemical parameters of Bolaang Mongondow waters. The parameters observed includes temperature, the clarity of water, salinity, dissolved oxygen (DO), phosphate, nitrate and PH. Samplings were conducted using Nansen tube on the surface layer (0-1 m) and near the bottom (> 15 m) on 9 research stations along Bolaang Mongondow coast-line. Measurements of temperature, salinity, brightness and pH are carried out in situ. Dissolved oxygen was measured via electrochemical method using AZ 8563 DO meter. Phosphate and nitrate were analyzed according to the light transmission method by using the 'Nicolet Evolution 100' spectrophotometer. The results obtained are water temperature ranging from 28.6-29.3 oC; salinity 28.0-32.5 o/oo; water clarity of 7.0-14.5 m; pH 7.36-7.80; dissolved oxygen 4.83-6.41 ppm; phosphate 0,005-0,0230 mg/l and nitrate 0,005-0,0090 mg/l. The statistical analysis using t-test showed that phosphate and dissolved oxygen in the water surface and close to the bottom of water were significantly different (t-hit> t-tab). The calculated index poluion calculation shows that the waters of Bolaang Mongondow ranged between unpolluted and lightly polluted. Variations in temperature, water clarity, salinity, dissolved oxygen, phosphate, nitrate and pH obtained in this study are still adequate to sustain marine life. Perairan Bolaang Mongondow, Sulawesi Utara adalah perairan estuari yang mempunyai peran penting karena kondisi  oseanografi dipengaruhi oleh aktivitas yang di berasal dari daratan maupun laut. Pengamatan kualitas air laut di wilayah perairan Bolaang Mongondow telah dilaksanakan pada bulan Februari 2019. Tujuan dari penelitian adalah untuk mengukur kualitas perairan berdasarkan parameter fisik-kimia air laut. Parameter yang diteliti meliputi suhu, salinitas, kecerahan, oksigen terlarut, fosfat, nitrat, dan pH . Sampel air laut diambil menggunakan tabung Nansen pada lapisan kedalaman permukaan air (0-1 m) dan perairan yang mendekati dasar (> 15 m) pada 9 stasiun penelitian. Pengukuran suhu, kecerahan, salinitas dan pH dilakukan secara langsung di lapangan. Pengukuran oksigen terlarut, fosfat dan nitrat dilakukan di laboratorium dengan metode elektrokimia menggunakan DO meter AZ-8563. Untuk oksigen terlarut dan metode transmisi cahaya dengan alat spektrofotometer ‘Nicolet Evolution 100’ untuk fosfat dan nitrat.  Hasil yang diperoleh yaitu suhu air berkisar antara 28,6-29,3 oC; salinitas 28,0-32,5 o/oo; kecerahan 7,0-14,5 m; pH 7,36-7,80; oksigen terlarut 4,83-6,41 ppm; fosfat 0,005-0,0230 mg/l dan nitrat 0,005-0,0090 mg/l. Oksigen terlarut dan fosfat yang terdapat di permukaan dan dekat dasar laut menunjukkan adanya perbedaan nyata (t-hit>t-tab) dengan menggunakan analisis uji t. Berdasarkan nilai indeks pencemaran menunjukkan perairan Bolaang Mongondow berada dalam kondisi baik hingga tercemar ringan. Variasi suhu, kecerahan, salinitas,  oksigen terlarut, fosfat, nitrat dan PH yang diperoleh masih berada dalam kisaran angka normal untuk kehidupan biota laut.
Mikroplastik pada Kedalaman Sedimen yang Berbeda di Pantai Ayah Kebumen Jawa Tengah Ali Ridlo; Raden Ario; Arif Maa’ruf Al Ayyub; Endang Supriyantini; Sri Sedjati
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.7424

Abstract

Microplastics are one of the most significants pollutan in the marine environment and accumulate in sediments. The purpose of this research is to know the abundance of microplastics at different sediment depth in Ayah Beach Kebumen Central Java. The sediment samples were collected from three depth, 0-5 cm, 6–10 cm and 11–15 cm. microplastics were separated from sediment through density fracxination using NaCl solutiaon and ZnCl2 solution respectively. This study demonstrated that microplastics were consistenly found in all depth. The type of microplastics found were fiber, fragment and film. Fiber was the most frequent type (> 70%) in all samples. At 0–5 cm depth were found  578 microplastisc particle, at 6–10 cm depth were 459 particles, and at 11–15 cm depth were 610 particles.     Mikroplastik merupakan salah satu polutan penting di laut dan terakumulasi di sedimen.  Penelitian ini bertujuan untuk mengetahui kandungan mikroplastik di sedimen Pantai Ayah kebumen Jawa Tengah. Penelitian ini bertujuan untuk mengetahui kelimpahan mikroplastik pada kedalaman sedimen 0-5 cm, 6–10 cm dan 11–15 cm. Mikroplastik dipisahkan dari sedimen dengan cara fraksinasi berdasarkan densitasnya berturut-turut menggunakan larutan NaCl dan larutan ZnCl2. Hasil penelitian menunjukkan mikroplastik ditemukan pada setiap kedalaman. Bentuk mikroplastik yang ditemukan adalah fragmen, fiber dan film. Bentuk fiber menyusun lebih dari 70 % mikroplastik dalam sedimen di ketiga tingkat kedalaman. Pada kedalaman 0–5 cm terdapat 578 partikel mikroplastik, pada kedalaman 6–10 cm ditemukan 459 partikel, dan pada kedalaman 11–15 cm terdapat  610 partikel. 
Struktur Komunitas Landak Laut di Padang Lamun Pulau Kodingareng, Kepulauan Spermonde Wilma Moka; Dwi Fajriyati Inaku; Muhammad Rais
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.9320

Abstract

Sea urchins is marine organism from Phylum Echinoderms which have high economic and ecological value. Therefore, we need data on the current condition of sea urchins, especially those in the Spermonde Islands. Through this research, it is hoped that the community structure and distribution of sea urchins in Kodingareng Lompo Island, Spermonde Islands can be known. The sampling method used was quadrant transects measuring 5x5 meters on 4 plots in the seagrass area on Kodingareng Lompo Island. The data analysis used was species composition, density, relative density, diversity index, and uniformity index. The results obtained show that there are three species of sea urchins, namely Diadema setosum, Mespilia globulus, and Tripneustes gratilla, basen on morphology identification. Diadema setosum is species with the highest species composition value, namely 92%. The density value (0.017 individuals / m2) and the diversity of sea urchins (H '<1) in the seagrass beds at Kodingareng Island are classified as low. It is hoped that the data obtained from this research can become a reference for the management of biological resources in the Spermonde Islands in the future. Landak laut merupakan salah satu kelas dari Filum Echinodermata yang memiliki nilai ekonomis dan ekologis yang cukup tinggi. Gonad landak laut telah sejak lama dikonsumsi di berbagai negara dunia, dan bahkan sekarang cangkangnya banyak dijadikan souvenir. Karena itu diperlukan data kondisi terkini landak laut, khususnya yang ada di Kepulauan Spermonde. Melalui penelitian ini diharapkan dapat diketahui struktur komunitas maupun sebaran landak laut yang ada di Padang Lamun Pulau Kodingareng Lompo, Kepulauan Spermonde. Metode sampling yang digunakan adalah transek kuadran ukuran 5x5 meter pada 4 plot pada daerah padang lamun di Pulau Kodingareng Lompo. Analisis data yang digunakan adalah komposisi jenis, kepadatan, kepadatan relatif, indeks keanekaragaman, dan indeks keseragaman. Hasil yang didapatkan memperlihatkan bahwa terdapat tiga genus landak laut, yaitu Diadema, Mespilia, dan Tripneustes. Diadema sp. merupakan genus dengan nilai komposisi jenis tertinggi yaitu 92%. Nilai kepadatan (0,017 individu/m2) dan keanekaragaman landak laut (H’<1) di padang lamun Pulau Kodingareng tergolong rendah. Data yang didapatkan dari penelitian ini diharapkan dapat menjadi bahan acuan untuk pengelolaan sumberdaya hayati di Kepulauan Spermonde ke depannya.
Improving The Antioxidant Activity of Sodium Alginate from Sargassum sp. by Thermal Heating and Chemical Methods Mila Safitri Rizfa; Ervia Yudiati; Diah Permata Wijayanti
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.8946

Abstract

The relationship between molecular structure and bioactivity was evaluated for sodium alginates obtained under different degradation treatment (raw alginates, heat-treated, and chemical-treated) from Sargassum sp. This study was conducted to identify the antioxidant activities of the degraded sodium alginate from Sargassum sp. compared to raw extract. Raw alginate as the control treatment was dried overnight at 60 °C, while heat-treated was heated raw alginate at 140oC in a laboratory oven (4.5 hours). Two chemical-treated were applied. Raw alginate added hydrogen peroxide and raw alginat with hydrogen peroxide plus ascorbic acid. This treatments were replicated three times. All the parameters were evaluated spectrophotometrically. The spectroscopy results from the degradation methods showed a new absorbance spectra pattern. The FT-IR spectrum revealed that treatment affects the structure of the alginates. Heat treated and chemical treated sodium alginates showed non significantly different on DPPH radical scavenging activity. Meanwhile, the combination of alginate and hydrogen peroxide treatment was at the lowest scavenging ability. Therefore, alginate oligosaccharides (AOS) produced by heating or adding chemical reagents could be considered as a stronger antioxidant than raw alginate, which may be applied in the industry and biomedical
Meta-analysis of Indonesian Octopus laqueus Kaneko & Kubodera 2005 (Cephalopoda: Octopodidae) using Mt-DNA COI as Genetic Marker Nenik Kholilah; Norma Afiati; Subagiyo Subagiyo; Retno Hartati
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.10190

Abstract

O. laqueus was first discovered not long ago in 2005 in the Ryuku Islands, Japan. Its geographical distribution and molecular identification are therefore still rarely. Nucleotide sequences based on mt-DNA COI for O. laqueus that have been uploaded in the GenBank until before this study was carried out were only six sequences. Since DNA barcoding of mt-DNA COI has some advantageous characteristics, this study aimed to analyse the genetic difference of Indonesian O. laqueus to the data available in the GenBank. Samples were collected in 2019 - 2020 from Karimunjawa (n=16) and Bangka-Belitung (n=2). The mt-DNA COI was extracted using 10% chelex methods, PCR amplified using Folmer’s primer and sequenced in Sanger methods. Pairwise alignment and genetic distance were carried out in MEGA-X, whereas the phylogenetic tree was reconstructed using Bayesian methods. BLAST identification resulted in 685 bp with a range of 92,07-99,24  percentages of identity. The genetic mean pair-wise distances within-clade were 0,002 and 0,006, whilst the distance between the clade was 0.0883. Combining the suggestion with the ITF current, it is concluded that O. laqueus taken from Karimunjawa raised from the same species as those in Malaysia (MN711655) and Japan (AB302176). Specimens from Bangka-Belitung were suggested came from different species, as they were separated into the second clade by 8.83%. One single sample from Japan (AB430543) which laid outside the two clades by 11.63%-11.38% was also suggested to represent a different species. Overall, this study opens to various further studies on O. laqueus using other loci of genetic markers.
Identifikasi Scatophagus argus yang dipasarkan di Jakarta berdasarkan Analisis Morfologi dan DNA Barcoding Sulistiowati Sulistiowati; Hawis Madduppa
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.7057

Abstract

Species list of economical fish landed in Muara Baru Modern Fish Market, Jakarta needs to be examined. Fish species information needs to know the species of fish being traded. However, many species are difficult to identify morphologically. The aim of this research was to identify fish based on their morphological characters and DNA barcoding. The methods of this research were morphologic, morphometric, and molecular identification with DNA barcoding using PCR. Morphological analysis results showed that fish samples have unique characteristics in the presence of spots on their bodies and fading in the abdomen. Morphometric observations were made with 19 different characters and weight measurements. The 19 fish characters observed have a standard deviation of <1, mean that the fish samples taken have a size that was not much different. A comparison ratio of 18 morphometric characters to total length (PT) showed variable results. Genetic analysis of the fish studied had the Max Score and Total Score was same, 1201, Query Coverage was 95%, and Ident was 100%. Based on morphological analysis and DNA barcoding used by fish species identified as Scatophagus argus species. Both methods were successfully carried out and the two methods complement each other to identify fish species correctly and accurately. Jumlah ikan ekonomis yang banyak diperjualbelikan di Pasar Muara Baru, Jakarta perlu dilakukan penelitian. Informasi spesies ikan perlu diketahui untuk mengetahui jenis ikan yang diperjualbelikan. Penelitian ini bertujuan untuk mengidentifikasi morfologi ikan dengan pendekatan studi morfometrik dan DNA barcoding. Metode yang digunakan dalam penelitian ini yaitu pengamatan morfologi dan pengukuran morfometri serta identifikasi molekuler dengan DNA barcoding menggunakan PCR. Hasil analisis morfologi menunjukkan bahwa sampel ikan memiliki karakteristik yang unik dengan adanya corak totol di seluruh tubuhnya dan memudar di bagian perut. Pengamatan morfometrik dilakukan dengan 19 karakter yang berbeda serta pengukuran berat. 19 karakter ikan yang diamati memiliki standar deviasi yang <1, artinya sampel ikan yang terambil memiliki ukuran yang tidak jauh berbeda. Rasio perbandingan 18 karakter morfometri terhadap panjang total (PT) menunjukkan hasil yang bervariasi. Analisis genetik dari ikan  yang diteliti memiliki Max Score dan Total Score sama yaitu 1201 dengan Query Coverage 95%, dan Ident 100%. Berdasarkan analisis morfologi dan DNA barcoding yang digunakan spesies ikan teridenfikasi spesies Scatophagus argus.  Kedua metode tersebut berhasil dilakukan dan kedua metode tersebut saling melengkapi untuk melakukan identifikasi spesies ikan secara tepat dan akurat.
Kepadatan Bivalvia di Kawasan Mangrove Sungai Perpat dan Sungai Bunting Belinyu, Bangka Nursah Putri; Budi Afriyansyah; Ristiyanti Marsetiyowati Marwoto
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.9838

Abstract

Indeks kepadatan bivalvia dapat digunakan sebagai indikator kualitas perairan. Tujuan penelitian ini untuk mengetahui kepadatan bivalvia di kawasan mangrove Sungai Perpat dan Sungai Bunting Belinyu, Bangka. Metode yang digunakan adalah purposive sampling. Pengamatan dilakukan pada enam stasiun dengan masing-masing lokasi sebanyak 3 stasiun yang terdiri dari 4 substasiun. Pengambilan sampel dilakukan dengan menggunakan plot ukuran 1 x 1 m sebanyak 5 plot. Analisis indeks ekologi meliputi: kepadatan jenis, keanekaragaman jenis, keseragaman dan dominansi. Hasil penelitian menunjukkan bahwa terdapat 12 spesies bivalvia yang tergolong dalam sembilan famili. Spesies bivalvia didominasi Geloina expansa dengan total kepadatan 3,5 ind/m2 sedangkan untuk tumbuhan mangrovenya didominasi oleh Rhizophora apiculata. Hasil analisis data menunjukkan bahwa keanekaragaman jenis bivalvia pada mangrove Sungai Perpat tergolong sedang, berkisar 0,614 – 1,675 sedangkan pada mangrove Sungai Bunting tergolong rendah, berkisar 0 – 0,952. Faktor lingkungan yang paling berpengaruh terhadap kepadatan bivalvia pada penelitian ini adalah suhu air dan pH air. Sedangkan hubungan antara kerapatan jenis mangrove terhadap kepadatan bivalvia pada penelitian ini menunjukkan hubungan sangat lemah.
Struktur Komunitas Ikan Karang dan Tutupan Karang pada Terumbu Buatan Artificial Patch Reef (APR) Munasik Munasik; Aldion Adin Nugroho; Retno Hartati; Agus Sabdono; Sugiyanto Sugiyanto; Denny Nugroho Sugianto
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.9171

Abstract

Artificial Patch Reef (APR) have been applied as a new method for Biodiversity Conservation Program at Panjang Island, Jepara since 2015. Previous study suggested that design and location of artificial reefs installation affected to abundance of reef fishes, associated with the artificial reef.  This study aims to investigated community structure of reef fishes associated to artificial patch reef comparing to reef fishes in nearby natural reefs. Assessment of coral reef condition on two habitats were conducted on July 2019, after 4 years deployment.  The results show that artificial patch reefs with a percentage of live coral cover are less than half of natural coral reefs, and have succeeded in increasing the abundance of reef fish with nearly the same density and community structure resembling reef fish in natural coral reefs. The similarity in community structure of the two habitats is probably due to the similarity in habitat type and morphology of the hard corals. The results indicate that Artificial Patch Reef (APR) reefs have increased the coral cover of Acropora branching and resulted in increased reef fish abundance which is compatible with reef fish communities associated with natural coral reefs around it. Aplikasi metode baru terumbu buatan Artificial patch Reef (APR) pada Program Konservasi Bioiversitas Pulau Panjang, Jepara telah dilakukan sejak 2015. Hasil studi menunjukkan bahwa pemilihan desain dan lokasi pemasangan terumbu buatan yang tepat akan meningkatkan kelimpahan ikan karang. Tujuan penelitian ini adalah untuk mengetahui keberhasilan penerapan terumbu buatan APR melalui kelimpahan ikan karang yang berasosiasi pada terumbu buatan dan terumbu karang alami di sekitarnya. Penilaian kondisi terumbu karang tersebut telah dilakukan pada Juli 2019 setelah 4 (empat) tahun pemasangan terumbu buatan. Hasil studi menunjukkan bahwa terumbu buatan dengan persentase tutupan karang hidup lebih kecil, separuhnya dari tutupan pada terumbu karang alami telah berhasil meningkatkan kelimpahan ikan karang dengan densitas hampir sama dan struktur komunitasnya menyerupai ikan karang yang berasosiasi dengan terumbu karang alami. Kesamaan struktur komunitas kedua habitat kemungkinan akibat kesamaan tipe habitat dan morfologi karang keras penyusunya. Hasil ini mengindikasikan bahwa terumbu buatan Artificial patch Reef (APR) telah meningkatkan tutupan karang bercabang Acropora dan berakibat terhadap meningkatnya kelimpahan ikan karang yang sesuai dengan komunitas ikan karang yang berasosiasi dengan terumbu karang alami di sekitarnya.
Penilaian Indeks Kesehatan Terumbu Karang di TWP Selat Bunga Laut, Kabupaten Kepulauan Mentawai Suparno Suparno; Yempita Efendi; Arlius Arlius; Mas Eriza; Bukhari Bukhari; Samsuardi Samsuardi; Yennafri Yennafri; M. Yaser Arafat
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.6449

Abstract

Coral reefs condition in the protected marine area at Selat Bunga has decreased every year.  The health of coral reefs is represented by coral index health. The purpose of this study was to analyze the coral reefs health index based on the condition of live coral cover, resilience level and condition of coral fish. Retrieval of coral reefs data using the Under Photo Transect Method and coral fish data collection using the Under Water Visual Census. The results of research at 9 research stations found that the average cover of live coral ranged from 1.40 - 44.68%, fleshy seaweed ranged from 0.13% - 12.87%, rubble ranged from 1.73 - 39.40%, and average total reef fish biomass ranged from 8.93 - 253.23 kg/ha. Coral reef health index values range between 3-6. Coral reefs health index of 67% of research stations is 3. The coral health index value 3 is indicated by a low percent live coral cover, a high resilience rate, and a low reef fish biomass.Kondisi terumbu karang di Kawasan Konservasi Taman Wisata Perairan (TWP) Selat Bunga Laut  telah mengalami penurunan setiap tahun.  Indeks kesehatan karang adalah nilai yang mengambarkan kesehatan karang antar lokasi penelitian. Tujuan penelitian ini adalah menganalisis indeks kesehatan terumbu karang berdasarkan kondisi tutupan karang hidup,  tingkat resiliensi dan kondisi ikan karang.  Pengambilan data terumbu karang dengan metode Under Photo Transect dan pengambilan data ikan karang mengunakan Under Water Visual Census. Hasil penelitian di 9 stasiun penelitian didapatkan persen rata-rata tutupan karang hidup berkisar  1.40- 44.68 %, fleshy seaweed berkisar  0.13% - 12.87%, pecahan karang berkisar 1.73 –39.40 %, dan rata-rata total biomassa ikan karang berkisar 8.93 – 253.23 kg/ha. Nilai indeks kesehatan terumbu karang berkisar antara 3-6. Sebanyak  67% stasiun penelitian mempunyai indeks kesehatan terumbu karang dengan skala 3. Indeks kesehatan karang skala 3 ditunjukkan  oleh  persen tutupan karang  hidup yang rendah, tingkat resiliensi yang tinggi dan biomassa ikan yang rendah.
Estimasi Stok Karbon Padaekosistem Lamun Di Perairan Utara Papua (Studi Kasus : Pulau Liki, Pulau Befondi Dan Pulau Meossu) Aditya Hikmat Nugraha; Ilham Antariksa Tasabaramo; Udhi E Hernawan; Susi Rahmawati; Risandi Dwirama Putra; Fadhliyah Idris
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.7939

Abstract

One of the ecological functions of the seagrass ecosystem is the ability to absorb carbon coming from the atmosphere. The ability of seagrass to absorb carbon is carried out through photosynthesis. The absorbed carbon will then be stored in the form of seagrass biomass in the seagrass body. This study aims to estimate the carbon stock content stored in seagrass ecosystems in the Northern waters of Papua including on Liki Island, Befondi Island, and Meossu Island. The calculation of carbon stock is done by converting seagrass biomass using constants derived from representative values of seagrass carbon content in Indonesian waters. In general, based on the results obtained indicate that the biomass at the bellow ground of the seagrass is greater than the biomass at above ground the seagrass. The value of organic carbon content in seagrasses is influenced by seagrass biomass. The carbon stock content in the seagrass ecosystem in the study area is in the range of 18,04 – 419,46 g C / m2. Stations on Liki Island have generally higher carbon stocks compared to stations on other islands.Salah satu fungsi ekologi dari ekosistem lamun yaitu memiliki kemampuan dalam menyerap karbon yang berasal dari atmosfer. Kemampuan lamun dalam menyerap karbon dilakukan melalui proses fotosintesis. Karbon yang terserap selanjutnya akan disimpan dalam bentuk biomassa lamun  pada tubuh lamun. Penelitian ini bertujuan untuk mengestimasi kandungan stok karbon yang tersimpan pada ekosistem lamun di Perairan Utara Papua tepatnya di Pulau Liki, Pulau Befondi dan Pulau Meossu. Perhitungan stok karbon dilakukan dengan melakukan konversi biomassa lamun menggunakan konstanta yang berasal dari nilai representatif konsentrasi kandungan karbon pada lamun yang berada di Perairan Indonesia. Secara umum berdasarkan hasil yang diperoleh menunjukkan bahwa biomassa pada bagian bawah lamun lebih besar dibandingkan dengan biomassa pada bagian atas lamun. Nilai kandungan karbon organik pada lamun dipengaruhi oleh biomassa lamun. Kandungan stok karbon pada ekosistem lamun di wilayah penelitian  berada pada kisaran 18,04 – 419,46 gC/m2. Stasiun yang berada di Pulau Liki memiliki stok karbon yang umumnya lebih tinggi dibandingkan dengan stasiun yang berada di pulau lainnya. 

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