Jurnal Kelautan Tropis最新文献

{"title":"RNA/DNA Ratio Performance of Blue Swimming Crab (Portunus pelagicus) Fed with Natural Food Phronima sp. and Artemia salina in Juvenile Phase","authors":"Sri Mulyani, Erni Indrawati, Syamsul Bahri","doi":"10.14710/jkt.v26i3.20149","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.20149","url":null,"abstract":"The availability and quality of fry is a major problem in blue swimming crab aquaculture, with the high mortality at the larval stage. RNA/DNA ratio is one of the parameters that can be used to evaluate the quality of crab fry, including health, nutrition, and growth conditions. This study aims to analyze the effect of Phronima sp. as a substitute feed for Artemia salina on the RNA/DNA ratio performance of blue swimming crab in juvenile phase (crablet 5) during rearing before cultivation in aquaculture ponds. This research was conducted at the Crab Hatchery Unit of the Brackish Water Aquaculture Fisheries Center (BPBAP) Takalar in February 2023. The study used a quantitative experimental completely randomized design (CRD) with five treatments and three repetitions. The ratio of Phronima sp. and Artemia sp. used were: Treatment A 100% Phronima sp; Treatment B 100% Artemia sp; Treatment C 75% Phronima sp and 25% Artemia sp; Treatment D 25% Phronima sp and 75% Artemia sp.; and E: Phronima 75%+Artemia salina 25%. The results showed that Artemia salina combined with Phronima sp. increased the RNA/DNA ratio of the crab compared to a single feed (100% Phronima sp. or Artemia salina 100%). The feed combination with the highest RNA/DNA ratio was shown in treatment E (Phronima sp. 25% + Artemia salina 75%) with an RNA/DNA ratio of 2.02 +0.032 ng/µL.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135547445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kelimpahan dan Karakteristik Mikroplastik di Perairan Kolam Llabuh dan Sungai Blangor Kecamatan Palang, Tuban","authors":"Fawaz Muhammad Sidiqi, Bambang Yulianto, Jusup Suprijanto","doi":"10.14710/jkt.v26i3.18498","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18498","url":null,"abstract":"Microplastic contamination has been identified in Indonesian water bodies, raising environmental concerns. This study investigates microplastic abundance and characteristics in water and sediment of Palang Waters (Kolam Labuh and Sungai Blangor) in Tuban. Seawater and river samples were collected using a 75 µm mesh plankton net. Microplastics were quantified under microscopy, and polymer analysis utilized Fourier Transform Infrared (FT-IR) spectroscopy. Seawater showed an abundance of 40,000 ± 11,357.82 particles/m3, with 48.75% fragments, 44.58% fibers, and 6.67% granules. River microplastic abundance was 13,333.33 ± 5,033.23 particles/m3, comprising 82.5% fibers, 10% fragments, and 7.5% granules. Sediment's average microplastic abundance was 226.67 ± 83.27 particles/m3, including 53% fibers, 29% fragments, and 18% granules. Statistical analysis highlighted significant differences in microplastic abundance among seawater, river water, and sediment (P-Value = 0.001). Notable differences existed between seawater and river water (P-value = 0.009), and seawater and sediment (P-value 0.001), but not between river water and sediment (P-value = 0.143). Polymer analysis revealed polymers such as Polyvinyl Chloride (PVC), Polyethylene (PE), and High-Density Polyethylene (HDPE). This research offers insights into microplastic presence, aiding in understanding aquatic pollution. Kontaminasi mikroplastik telah terjadi di beberapa perairan Indonesia. Mikroplastik memiliki ukuran ≤5 mm. Penelitian ini bertujuan untuk mengetahui kelimpahan dan karakteristik mikroplastik pada air dan sedimen di Perairan Kolam Labuh dan Sungai Blangor, Kecamatan Palang, Tuban. Sampel air laut dan sungai diambil menggunakan plankton net dengan ukuran mesh 75 µm. Kelimpahan dan bentuk mikroplastik dihitung dan diamati menggunakan mikroskop, dan analisis polimer menggunakan uji Fourier Transform Infrared (FT-IR). Hasil penelitian menunjukkan bahwa kelimpahan mikroplastik pada air laut sebanyak 40.000 ± 11.357,82 partikel/m3, bentuk fragmen sebanyak 48,75 %, kemudian fiber sebanyak 44,58 % dan granules sebanyak 6,67% pada air laut. Sedangkan di Sungai didapatkan kelimpahan mikroplastik sebanyak 13.333,33 ± 5.033,23 partikel/m3, bentuk fiber sebanyak 82,5 %,fragmen 10 % dan fiber 7,5 %. Kelimpahan rata-rata mikroplastik pada sedimen ialah 226,67 ± 83,27 , bentuk fiber sebanyak 53%, fragmen 29% dan granules 18%. Hasil penelitian juga menunjukkan adanya perbedaan kelimpahan mikroplastik pada air laut, sungai dan sedimen (P-Value = 0,001). Perbedaan kelimpahan mikroplastik terjadi antara air laut dengan air sungai (P-value = 0,009) dan antara air laut dengan sedimen (P-value 0,001), sedangkan antara air sungai dan sedimen tidak terjadi perbedaan (P-value = 0,143). Hasil analisis polimer menunjukkan jenis polimer yang ditemukan meliputi Polivinil Klorida (PVC), Polyethylene (PE) dan High-Density Polyethylene (HDPE).","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135647420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perkembangan Diatom Perifiton Pada Substrat Buatan di Perairan Pulau Panjang, Jepara","authors":"Syauqina Nashihi Aufar, Agus Sabdono, Diah Permata Wijayanti, M. Munasik","doi":"10.14710/jkt.v26i3.19779","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.19779","url":null,"abstract":"Degradation of marine waters in Panjang Island is increasing resulting in high production of benthic periphyton. Procurement of hard substrate as material for artificial reefs is one of the efforts to see the succession pattern of benthic periphyton microscopically. The purpose of this study was to determine the differences in the abundance and composition of diatoms in geopolymer concrete and ordinary concrete substrates. The method used is the field experimental method, immersing different concrete substrates, namely geopolymer concrete (BA) and ordinary concrete (BT) in the sea waters of Panjang Island at a depth of 3 m for 2 months. Periphyton growth on the substrate was observed microscopically using the Scanning Electronic Microscope (SEM) method. Observations were made at immersion time of 1 day (T1), 7 days (T2), 14 days (T3), 28 days (T4), and 56 days (T5). The results showed that there were differences in the development of Periphyton Diatoms between geopolymer (BA) and ordinary concrete (BT) substrates. On both substrates, periphyton growth was found starting from the observation of soaking for 1 day. The density and diversity of periphyton on the BA substrate was higher than that of the BT substrate, with a density of 2535 cell cm-2 and 73 cell cm-2, respectively, and the diversity of H'Shanon Wiener was 4.07 and 0.33. The benefit of this research is to determine the initial succession of biofilm formation on artificial substrates as a building material for artificial reefs for coral reef restoration programs, especially in marginal reef conditions.  Degradasi perairan laut di Pulau Panjang semakin meningkat mengakibatkan produksi perifiton bentik yang tinggi. Pengadaan substrat keras sebagai bahan terumbu buatan menjadi salah satu upaya untuk melihat pola suksesi perifiton bentik secara mikroskopis.  Tujuan dilakukannya penelitian ini untuk mengetahui perbedaan kelimpahan dan komposisi diatom pada substrat beton geopolimer dan beton biasa. Metode yang digunakan yaitu metode eksperimental lapangan, dilakukan perendaman substrat beton yang berbeda yaitu beton geopolymer (BA) dan beton biasa (BT) di perairan laut pulau Panjangdi pada kedalaman 3 m selama 2 bulan. Pertumbuhan perifiton pada substrat diamati secara mikroskopis menggunakan metode Scanning Electronic Microscope (SEM).  Pengamatan dilakukan pada lama perendaman 1 hari (T1), 7hari (T2), 14 hari (T3), 28 hari (T4), dan 56 hari (T5). Hasil penelitian menunjukkan ada perbedaan Perkembangan Diatom Perifiton antara substrat geopolymer (BA) dan beton biasa (BT). Pada ke dua substrat dijumpai pertumbuhan perifiton mulai pengamatan perendaman selama 1 hari. Densitas dan keragaman perifiton pada substrat BA lebih tinggi daripada substrat BT yaitu masing-masing dengan densitas 2535 sel cm-2 dan 73 sel cm-2, dan keragaman H’Shanon Wiener  sebesar 4,07 dan 0,33. Manfaat dari penelitian ini adalah untuk mengetahui suksesi awal pembentukan biofilm pada substrat buatan sebagai bahan penyusu","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139342593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimasi Cadangan Karbon Pada Ekosistem Mangrove Di Desa Pengudang Kecamatan Teluk Sebong Kabupaten Bintan","authors":"Diah Alviana, Rika Anggraini, Jelita Rahma Hidayati, Ita Karlina, Febrianti Lestari, Dony Apdillah, Agung Dhamar Syakti, Dermawati Sihite","doi":"10.14710/jkt.v26i3.18326","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18326","url":null,"abstract":"Mangrove have a role in the absorption and storage of carbon from the atmosphere, which is stored in the form of biomass and sediment, so that mangroves have enormous potential in mitigation global climate change because they can reduce greenhouse gas emission is carbon. Mangrove store carbon in carbon pools including above ground biomass, below ground biomass, litter or dead wood, and soil. The purpose of this study was to calculate the value of carbon stock and carbon sequestration in mangroves in Pengudang Villages, Teluk Sebong District, Bintan Regency. This research was conducted in September – October 2022, the research method used purposive sampling non-destructive method with allometric model and sediment sampling was carried out at 30 cm intervals until the discovery of humus soil. The result of biomass calculations were then converted into carbon stock values and mangrove carbon sequestration. Data analysis was carried out by calculating biomass, carbon stock value and carbon sequestration in mangroves in Pengudang Villages, Teluk Sebong District, Bintan Regency. The result showed the total biomass value was 498,77 tons/ha, the carbon stock value was 1203,27 tonsC/ha, while the carbon sequestration value was 4412,05 tonsC/ha.  Mangrove berperan dalam penyerapan dan penyimpanan karbon dari atmosfer yang disimpan dalam bentuk biomassa dan sedimen, sehingga mangrove memiliki potensi yang sangat besar dalam mitigasi perubahan iklim global karena dapat mengurangi emisi gas rumah kaca yaitu karbon. Mangrove menyimpan karbon dalam kantong karbon diantaranya adalah biomassa bagian atas, biomassa bagian bawah, serasah atau kayu mati dan tanah.  Tujuan penelitian ini untuk menghitung nilai stok karbon dan sekuestrasi karbon pada mangrove di Desa Pengudang Kecamatan Teluk Sebong Kabupaten Bintan. Penelitian ini dilakukan pada bulan September – Oktober tahun 2022, metode penelitian yang digunakan adalah purposive sampling metode non-destruktif dengan model alometrik dan dilakukan pengambilan sampel sedimen per-interval 30cm hingga ditemukannya tanah humus. Hasil perhitungan biomassa kemudian dilakukan konversi nilai stok karbon dan sekuestrasi karbon mangrove. Analisis data dilakukan dengan menghitung biomassa, nilai stok karbon dan sekuestrasi karbon pada mangrove di Desa Pengudang Kecamatan Teluk Sebong Kabupaten Bintan. Hasil penelitian menunjukkan nilai total biomassa 498,77 ton/ha nilai stok karbon adalah 1203,27 tonC/ha sedangkan nilai sekuestrasi karbon adalah 4412,05 tonC/ha.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catatan Pertama Distribusi Tridacna noae (Röding, 1798) dari Perairan Kepulauan Kei, Maluku","authors":"Teddy Triandiza, U. E. Hernawan, Agus Kusnadi","doi":"10.14710/jkt.v26i3.18421","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18421","url":null,"abstract":"The giant clams are the biggest  living bivalves that not only play a  vital role in coral reef ecosystem, but also as a food provider for coastal inhabitant. One of these species was Tridacna noae which is a crpyctic species due to morphoplogial characteristic similarity and habitat preferences with Tridacna maxima. Tridacna noae was recorded at the first time found in Kei Islands on November and December 2017 based on morphological characteristic and DNA barcoding analysis. This research found 8 individu of T. Noae in total, 7 individu was found in Kur Island and one individu from Ohoidertom at 2-3 m depth. The mantle pattern of T. noae was very unique and can be used to distinguished from T. maxima. Special feature of ormanent mantle of T. noae indicated with oval-shape patch with white line on the edge, has hyaline organ scattered along the margin of mantle and the presence of papillae that clearly seen. The result on Blasting from GenBank NCBI for COI sequence of giant clam sample revealed that 99.79%-100% was identical with T. noae species. Furthermore, result on genetic distance analysis of T. noae sample from Kei Island compare with T.noae from GenBank was 0.00-0.051, while genetic distance value compare with T. maxima was 0.159 – 0.205. The new finding of T. noae in Kei Island has added the number of giant clam species recorded previously become 7 species. This finding was also has enhanced the information on biogeographical distribution of T.noae in Indonesia.  Kerang kima merupakan kelompok bivalvia berukuran paling besar yang memlilki peranan penting di ekosistem terumbu karang serta menjadi sumber nutrisi bagi masyarakat peisir. Salah satu species kima adalah Tridacna noae yang bersifat cryptic spesies karena memiliki banyak kesamaan karakteristik morfologi dan preferensi habitat dengan T. Maxima. T. noae tercatat pertama kali ditemukan di Perairan Kepulauan Kei pada bulan November dan Desember 2017 berdasarkan pengamatan karekteristik morfologi dan aplikasi DNA barcoding. Hasil peneltian menemukan delapan individu T. noae, tujuh individu ditemukan di Perairan Pulau Kur, satu individu ditemukan di Perairan Ohoidertoom dengan kedalaman perairan 2-3 m. Ornamen mantel T. noae sangat khas dan dapat digunakan untuk membedakan dari T. maxima. Ornamen mantel ditandai dengan patch berbentuk oval terpisah dengan garis putih di tepi, memiliki organ hialin yang tersebar di sepanjang margin mantel, dan kehadiran papila yang terlihat jelas. Hasil blasting di GenBank NCBI untuk sekuens COI sampel kima menghasilkan tingkat kemiripan 99.79%-100% (identik) dengan T. noae. Hasil analisis jarak genetik sampel T. noae asal Kepulauan Kei dengan T. noae Genbank adalah sebesar 0.00 hingga 0.051, sedangkan jarak genetik dengan T. maxima adalah 0.159 hingga 0.205. Temuan T. noae di Kepulauan Kei menambahkan jenis kima yang tercatat sebelumnya di Kepulauan Kei menjadi 7 jenis. Temuan ini juga menambahkan lebih banyak informasi tentang distribusi geografis T. ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Keberadaan Gastropoda Mangrove Pasca 18 Tahun Tsunami dan 16 Tahun Rehabilitasi Pantai di Kota Banda Aceh","authors":"S. Syahrial, C. 'Akla, Riri Ezraneti, Repki Prasetyo, Shela Annisa Batubara, Muhammad Afif Tri Putra, Jasmine Wiyanda Fadillah, Reslina Tumangger, Helda Diah Ananda","doi":"10.14710/jkt.v26i3.15987","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.15987","url":null,"abstract":"The purposes of the reasearch that was conducted on July 2022 are to determine the biodiversity, composition, density, community index, correlation and contribution of gastropods on 18 year post tsunami and 16 year coastal rehabilitation in research observation of Banda Aceh. The method used is purposive sampling with 4 observation stations. Gastropods were collected using a quadratic transect perpendicular to the shoreline. PCA analysis was carried out to determine the level of contribution of gastropod species based on observation stations, while SIMPER and CA analyzes were carried out to compare and classify gastropod communities. A total of 8 families, 8 genera, 10 species and 6945 ind gastropods were found with densities ranging from 37.55 – 136.60 ind/m2. The highest diversity index was found at Station II (0.63), the highest uniformity index was found at Station III (0.86) and the highest dominance index was found at Station I (0.99). Gastropods Nerita planospira, Cassidula aurisfelis, C. nucleus, Sphaerassiminea miniata and Oncidium sp. closely related to Rhizophora mucronata and Avicennia alba growing on muddy substrates, while Morula iostoma, Cerithidea cingulata, Littoraria melanostoma, Nassarius olivaceus and L. scabra were closely related to R. mucronata growing on sandy mud substrates. Furthermore, C. cingulata species contributed at Stations I and IV, while C. aurisfelis species contributed at Stations II and III.  Kajian dilakukan pada bulan Juli 2022 yang bertujuan untuk mengetahui biodiversitas, komposisi, kepadatan, indeks komunitas serta keterkaitan dan kontribusi gastropoda terhadap stasiun pengamatan pasca 18 tahun tsunami dan 16 tahun rehabilitasi pantai di Kota Banda Aceh. Metode yang digunakan adalah purposive sampling dengan 4 stasiun pengamatan. Gastropoda dikumpulkan menggunakan transek kuadrat yang tegak lurus garis pantai. Analisis PCA dilakukan untuk mengetahui tingkat kontribusi spesies gastropoda berdasarkan stasiun pengamatan, sedangkan analisis SIMPER dan CA dilakukan untuk membandingkan serta mengklasifikasikan komunitas gastropodanya. Sebanyak 8 famili, 8 genus, 10 spesies dan 6945 ind gastropoda ditemukan dengan komposisi gastropoda antar stasiun pengamatannya berbeda nyata (p = 0.000) serta kepadatan gastropodanya berkisar antara 37.55 – 136.60 ind/m2. Indeks keanekaragaman tertinggi ditemukan pada Stasiun II (0.63), indeks keseragaman tertinggi ditemukan pada Stasiun III (0.86) dan indeks dominasi tertinggi ditemukan pada Stasiun I (0.99). Gastropoda Nerita planospira, Cassidula aurisfelis, C. nucleus, Sphaerassiminea miniata dan Oncidium sp. berkaitan erat dengan Stasiun II dan III (substratnya berlumpur), sedangkan Morula iostoma, Cerithidea cingulata, Littoraria melanostoma, Nassarius olivaceus dan L. scabra berkaitan erat dengan Stasiun I dan IV (substratnya lumpur berpasir). Selanjutnya, spesies C. cingulata memiliki kontribusi di Stasiun I maupun IV, sedangkan spesies C. aurisfelis memiliki kontribusi","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139362368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pemanfaatan Citra Satelit Aqua-MODIS untuk Pemantauan Dinamika Spasio-Temporal Produktivitas Primer Bersih di Perairan Laut Jawa","authors":"Alfandy Putra Anugrah, Zainul Hidayah, Abdurrahman As-Syakur, Herlambang Aulia Rachman","doi":"10.14710/jkt.v26i3.18222","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18222","url":null,"abstract":"The Java Sea is an area with the highest rate of exploitation of fishery resources in Indonesia. As much as 32% of the total national fishery production or 2.2 million tons has come from catches in the Java Sea, even though the area of these waters only covers 7% of the total area of national waters. Fisheries productivity is related to the net primary productivity value resulting from the activity of phytoplankton or chlorophyll-a. Net primary productivity (NPP) is influenced by the presence of nutrients, light, chlorophyll-a, Photosynthetically Available Radiation (PAR) and sea surface temperature (SST). The purpose of this research is to analyze the distribution value of net primary productivity in the Java Sea by utilizing Aqua-MODIS satellite imagery using the Vertically Generalized Production Model (VGPM) method with a range of 2017-2021. The results showed that the waters of the Java Sea have quite high fertility and are classified as Eutrophic because the general monthly average from 2017-2021 has an NPP value of >750 mgC/m2/day. The value of primary productivity follows the seasonal pattern, will be high in the east moonson season and decrease in the west monsoon season. Laut Jawa merupakan wilayah dengan laju eksploitasi sumberdaya perikanan tertinggi di Indonesia. Sebanyak 32% dari total produksi perikanan nasional atau sebesar 2,2 juta ton berasal dari hasil tangkapan di Laut Jawa meskipun luas wilayah perairan ini hanya mencakup 7% dari total luas wilayah perairan nasional. Produktivitas perikanan tangkap berhubungan dengan nilai produktivitas primer bersih hasil dari aktivitas fitoplankton atau klorofil-a. Produktivitas primer bersih di suatu perairan dipengaruhi oleh adanya unsur hara, cahaya, klorofil-a, Photosynthetically Available Radiation (PAR) dan suhu permukaan laut (SPL). Tujuan dari penelitian ini adalah untuk menganalisis nilai distribusi produktivitas primer bersih di Laut Jawa dengan memanfaatkan citra satelit Aqua-MODIS menggunakan metode Vertically Generalized Production Model (VGPM) dengan rentang tahun 2017-2021. Hasil penelitian menunjukkan bahwa perairan Laut Jawa memiliki kesuburan yang cukup tinggi dan tergolong Eutrofik karena rata-rata bulanan secara umum mulai dari tahun 2017-2021 memiliki nilai NPP >750 mgC/m2/hari. Nilai produktivitas primer mengikuti pola musim, akan tinggi pada musim timur (kemarau) dan menurun pada musim barat (penghujan).","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135503311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular phylogenetic analysis of commercially important Asian monsoon scallop, Amusium pleuronectes (Linnaeus 1758) from Indonesia","authors":"Eko Hardianto, Tony Budi Satriyo","doi":"10.14710/jkt.v26i3.18049","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18049","url":null,"abstract":"The Asian monsoon scallop, Amusium pleuronectes, is a key member of shellfish communities that are the most commercially harvested in Asia. Materials were obtained from four sites in Indonesia: Semarang, Bali Island, Maros and Buru Island. Nucleotide sequence analysis was performed on PCR-amplified mitochondrial DNA 16S rRNA. In total, 556-558 base pair nucleotide sequences were obtained from 8 individuals. Molecular analyses revealed that the samples belong to the A. pleuronectes species. Phylogenetic analyses were carried out by comparing the gene sequences of A. pleuronectes haplotypes in Indonesia with gene sequences of the same base pair length and with the of A. japonicum which was used as an outgroup. The phylogenetic trees were consistent and indicated in the two sub-clades. The presence of A. pleuronectes and the phylogenetic status of the A. pleuronectes Indonesian haplotype were reported. Clarifying the phylogenetic status of ecologically important species provides basic information for biosecurity studies for possible future conservation and control programs.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135503312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pemetaan Kerapatan Ekosistem Mangrove Menggunakan Analisis Normalized Difference Vegetation Index di Pesisir Kota Semarang","authors":"Fani Safitri, Luky Adrianto, Wayan Nurjaya, ¹Departemen Manajemen, Sumberdaya Perairan, F. Perikanan, Ilmu Kelautan","doi":"10.14710/jkt.v26i2.18173","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.18173","url":null,"abstract":"Mangrove ecosystem in Semarang City has an important role for survival of the coastal area. This is due to the function of mangroves as a barrier to coastal erosion, wave barrier, carbon producer, as a habitat for biota in coastal areas, as well as improving water quality. However, as time goes by, mangroves condition in coastal of Semarang is decreasing every year and causing coastal disasters such as coastal erosion and tidal flooding which have identically occurred on the coast of Semarang. Mangrove ecosystem area in coastal of Semarang City in 2020 is 163,250 Ha. The aim of this study is to determine the density of mangroves ecosystem from 2013 to 2022 with Landsat 8 and Sentinel 2 satellites. The method used to classify and determine the density of mangroves ecosystem is NDVI or Normalized Difference Vegetation Index. The results of analysis show that the mangrove density in 2013 was 412.889 Ha, while in 2022 it was 142.562 Ha. The density of mangroves has decreased by around 270.327 Ha (65.5%), this is due to erosion, land conversion into pond areas, and recently the construction of the Semarang-Demak sea wall. Whereas Sentinel 2 satellite is better to use because it has better image quality, details, and accuracy to show objects on the earth's surface compared to Landsat 8.   Ekosistem mangrove di Kota Semarang memiliki peran yang penting bagi keberlangsungan hidup wilayah pesisir. Hal tersebut dikarenakan fungsi mangrove sebagai penahan erosi pantai, penahan gelombang, penghasil karbon, sebagai habitat bagi biota di wilayah pesisir, serta memperbaiki kualitas air. Namun seiring perkembangan zaman, kondisi mangrove di pesisir Semarang semakin tahun kian berkurang sehingga menimbulkan bencana pesisir seperti terjadinya erosi pantai dan banjir rob yang telah identik terjadi di pesisir Semarang.  Luas ekosistem mangrove di wilayah pesisir Kota Semarang pada tahun 2020 yaitu seluas 163,250 Ha. Tujuan dari penelitian ini yaitu untuk mengetahui kerapatan ekosistem mangrove dari tahun 2013 hingga 2022 dengan citra satelit Landsat 8 dan citra Sentinel 2. Metode yang digunakan untuk mengelaskan dan mengetahui kerapatan ekosistem mangrove adalah metode NDVI atau Normalized Difference Vegetation Index. Hasil analisa menunjukkan bahwa kerapatan mangrove pada tahun 2013 seluas 412,889 Ha, sedangkan pada tahun 2022 seluas 142,562 Ha. Kerapatan mangrove mengalami penurunan sekitar 270,327 Ha (65,5%), hal tersebut disebabkan karena adanya erosi, alih fungsi lahan menjadi area tambak, serta baru-baru ini yaitu adanya pembangunan tanggul laut Semarang-Demak. Sedangkan citra satelit Sentinel 2 merupakan citra yang lebih baik digunakan karena memiliki kualitas gambar yang lebih bagus, detail, dan akurat untuk menunjukkan obyek dipermukaan bumi dibandingkan dengan citra Landsat 8.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47009424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimasi Stok Karbon Padang Lamun menggunakan Citra Spot-7 di Perairan Pulau Kodingarenglompo, Sangkarrang, Kota Makassar","authors":"Muhardi Rais, Dwi Fajriyati Inaku, W. Moka, Supriadi Mashoreng, Dewi Yanuarita Satari, Nita Rukminasari","doi":"10.14710/jkt.v26i2.16496","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.16496","url":null,"abstract":"Seagrass is the most effective ecosystem in absorbing carbon. The ability of seagrasses to absorb CO2 from the atmosphere is better than terrestrial ecosystems. Image processing methods and information regarding potential carbon stocks in seagrass beds can then be used as a basis for managing carbon stocks found in coastal areas and small islands. This study aims to estimate the carbon stock of seagrass beds in the waters of Kodingarenglompo Island using remote sensing technology. This research was conducted from March to August 2020. The stages of the field survey were to identify the percentage of seagrass cover in 62 plot points. Seagrass carbon stocks are known based on seagrass cover percentage data using the regression equation. The estimation of seagrass carbon stocks in the study area is divided into two, namely AGC and BGC. The image processing stage is by using the random forest regression algorithm in mapping seagrass carbon stocks. The results of this research survey revealed six species of seagrass, namely Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Thalassia hemprichii and Syringodium isoetifolium and were dominated by 2 species of seagrass, namely Thalassia hemprichii and Enhalus acoroides. The results showed that remote sensing can be used to map seagrass carbon stocks. Seagrass carbon stocks can be mapped with a maximum accuracy of 67% (SE=1.96 KgC/Pixel), and 85% (SE=7.86 KgC/Pixel) for AGC and BGC. From this model, the total ecosystem carbon stock in seagrasses in the waters of Kodingarenglompo Island is estimated to be around 178.98 tons of organic carbon with an area of seagrass beds of 81.29 hectares. The availability of seagrass carbon stock maps is very important to provide a better understanding of the spatial and temporal distribution of carbon dynamics.  Lamun adalah ekosistem yang paling efektif dalam menyerap karbon. Kemampuan lamun untuk menyerap CO2 dari atmosfer lebih baik dari ekosistem darat. Metode pengolahan citra serta informasi mengenai potensi cadangan karbon pada padang lamun selanjutnya dapat dijadikan sebagai dasar pengelolaan stok karbon yang terdapat di pesisir dan pulau-puau kecil. Penelitian ini bertujuan untuk mengestimasi stok karbon padang lamun di perairan Pulau Kodingarenglompo menggunakan teknologi penginderaan jauh. Penelitian ini dilaksanakan dari bulan Maret sampai Agustus 2020. Tahapan survei lapangan yaitu mengidentifikasi persentase tutupan jenis padang lamun sebanyak 62 plot titik. Stok karbon lamun diketahui berdasarkan data persentase tutupan lamun menggunakan persamaan regresi. Estimasi stok karbon padang lamun pada daerah kajian dibedakan menjadi dua yaitu AGC dan BGC. Tahap pengolahan citra yaitu dengan menggunakan algoritma regresi random forest dalam memetakan stok karbon lamun. Hasil survei penelitian ini mendapatkan enam jenis lamun yaitu Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Thalassia hemprichii dan Syring","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45535443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}