Jurnal Kelautan Tropis最新文献

{"title":"Kebiasaan Makanan Beberapa Jenis Ikan di Ekosistem Mangrove Lubuk Kertang, Sumatera Utara","authors":"Ananingtyas S Darmarini, Desrita Desrita, Onrizal Onrizal","doi":"10.14710/jkt.v26i2.16143","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.16143","url":null,"abstract":"Mangrove ecosystems are very important for coastal waters, one of which is as a provider of food sources for biota in the surrounding waters. This study aims to determine the food habits of several types of fish found in the waters around the Lubuk Kertang mangrove ecosystem, Langkat, North Sumatra. The research location is a mangrove restoration area with the main species Rhizopora apiculata. The research was conducted in January 2021. The collection of fish samples was carried out using gill net with 1.5 inchi which is commonly used by fishermen. Sampling was carried out by spreading the net three times. The tested fish samples consisted of 46 individuals with 12 species, 9 families, and 6 orders. The highest number of fish caught was Clupeiformes with a percentage of 41.67%, while the order found with a low percentage was Beloniformes (2%). The families found in large numbers were Mugillidae, the families found in low numbers were Lutjanidae and Serranidae. The species caught the most is Chelon subviridis. Stomach contents analysis was performed with the Index of Preponderance (IP). Based on the type of food found in the stomach contents of the test fish, there were various types of food consisting of 11 types, namely phytoplankton, zooplankton, squid, fish (juvenile fish), crabs, shrimp, shellfish, litter, moss, pieces of insect bodies, and plant parts. The types of food that the plant fragments are found in are 9 fish species, phytoplankton (7 species), shrimp (7 species), and litter (5 species).  Ekosistem mangrove sangat penting bagi perairan salah satunya adalah sebagai penyedia sumber makanan biota pada perairan di sekitarnya. Penelitian ini bertujuan untuk mengetahui kebiasaan makanan beberapa jenis ikan yang ditemukan di perairan sekitar ekosistem mangrove Lubuk Kertang, Langkat, Sumatera Utara. Lokasi penelitian merupakan merupakan wilayah restorasi mangrove dengan vegetasi utama Rhizopora apiculata. Penelitian dilakukan pada bulan Januari 2021. Pengumpulan sampel ikan dilakukan dengan menggunakan jaring gill net dengan ukuran 1.5 inchi yang biasa digunakan oleh nelayan. Sampling dilakukan dengan melakukan tiga kali tebar jaring. Sampel ikan uji terdiri dari 46 individu dengan 12 spesies, 9 famili, dan 6 ordo. Jumlah ikan terbanyak yang tertangkap adalah Clupeiformes dengan persentase sebesar 41.67%, sedangkan ordo yang ditemukan dengan persentase yang rendah adalah Beloniformes (2%). Famili yang ditemukan dalam jumlah besar adalah Mugillidae, famili yang ditemukan dengan jumlah rendah adalah Lutjanidae dan Serranidae. Spesies yang paling banyak tertangkap adalah jenis Chelon subviridis. Analisis isi perut dilakukan dengan Indeks of Preponderance (IP). Berdasarkan jenis makanan yang ditemukan pada isi perut ikan uji, terdapat berbagai jenis makanan yang terdiri dari 11 jenis yaitu fitoplankton, zooplankton, cumi-cumi, ikan (juvenil ikan), kepiting, udang, cangkang kerang, serasah, lumut, potongan tubuh serangga, dan potongan tubuh tum","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43079664","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":"Effect of different diets on growth performance, physiological response and behavior of spiny lobster Panulirus homarus (Linnaeus, 1758)","authors":"A. Rivaie, Y. T. Adiputra, Agus Setyawan, Dwi Handoko Putro","doi":"10.14710/jkt.v26i2.17656","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17656","url":null,"abstract":"This study aimed to know the effect of different feedings on growth performance, physiological responses, and behavioral changes of juvenile spiny lobsters. The experimental method used a completely randomized design with three treatments and four replications. There were three different feeds used as treatment, namely: flesh mussel (K), commercial fish feed (I), and commercial shrimp feed (U). Feed is given as much as 30% of body weight, five times per day at 6:30 am, 12:00 pm, 4:00 pm, 9:00 pm, and 2:00 am. The results showed that the commercial feeding of fish (I) significantly (P<0.05) increased the survival rate and biomass of spiny lobster for 54.17% and 141.7 g, respectively. While fresh mussel give better growth and stress response, but had the lowest survival rate. The results of the physiological response test of lobster were more effective in suppressing lobster stress levels than other treatments (P<0.05). The behavior of juvenile spiny lobsters showed a very striking color difference and reflex impairment scores, which indicated that the vitality of the treated juveniles (I) was better than the vitality of the treatments (K) and treatment (U). This study shows that commercial fish feed (I) is recommended for maintaining spiny lobsters in the juvenile phase, although it needs further maintenance by using an appropriate feed formulation to improve the growth performance of spiny lobsters.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44550939","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":"Uji Akurasi Beberapa Algoritma Material Padatan Tersuspensi Menggunakan Citra Sentinel-2A di Muara Banjir Kanal Timur Semarang","authors":"Maulana Al Faridzie, Lilik Maslukah, Dwi Haryo Ismunarti, Anindya Wirasatriya","doi":"10.14710/jkt.v26i3.17496","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.17496","url":null,"abstract":"Total suspended solids (TSS) are one of the variables that determine water quality and are one of the factors influencing the sedimentation process in estuarine waters. The use of conventional methods has high accuracy but is inefficient in terms of cost and time. One of the water quality monitoring (TSS) solutions is to use a TSS concentration prediction algorithm that is specific to each water. The purpose of this study was to test the accuracy performance of several algorithms from other waters when applied to the Estuary of Banjir Kanal Timur (BKT). The method used is water quality sampling of 100 stations which is carried out simultaneously with the passing time of the Sentinel-2A image. The data is then used as a reference for the TSS concentration value in the algorithm validation test for predicting TSS concentrations in the waters of the estuary of BKT. The prediction algorithms of TSS concentration used are Parwati, Wirasatriya, LEL, and Lemigas algorithms. The statistical parameters of MAPE, RMSE, and coefficient of determination (R2) were used to test the error. The most appropriate algorithm for evaluating the field value is Wirasatriya’s algorithm. The validation test is RMSE = 9.1694 and MAPE = 15.9984%. The resulting regression model between the best image prediction data (Wirasatriya) and field data obtained the coefficient of determination, R2 = 0.5441. The TSS monitoring in the BKT estuary is recommended to use Wirasatriya's algorithm for Sentinel-2, proving its validity and/or creating a specific algorithm for the BKT estuary waters. Each region has unique characteristics, so it needs to be generated. Material padatan tersuspensi (MPT) merupakan salah satu variabel yang menentukan kualitas air dan menjadi salah satu faktor yang mempengaruhi proses sedimentasi di perairan muara. Penggunaan metode secara konvensional memiliki akurasi tinggi, akan tetapi kurang efisien secara biaya dan waktu. Salah satu solusi pemantauan kualitas air (MPT) adalah menggunakan algoritma prediksi konsentrasi MPT yang sifatnya spesifik untuk masing-masing perairan. Tujuan penelitian ini adalah melakukan uji validasi untuk menentukan nilai error yang dihasilkan dari beberapa algoritma, apabila diaplikasikan pada perairan Muara Banjir Kanal Timur(BKT) Semarang. Metode yang digunakan adalah pengambilan sampel kualitas air sebanyak 100 stasiun yang dilaksanakan bersamaan dengan saat passing time citra Sentinel-2A. Data tersebut kemudian dijadikan acuan nilai konsentrasi MPT dalammenguji kinerja algoritma untuk prediksi MPT pada perairan Muara BKT. Algoritma prediksi konsentrasi MPT yang digunakan adalah algoritma Parwati, Wirasatriya, LEL, dan Lemigas. Pengujian error dilakukan dengan beberapa parameter statistik yaitu MAPE, RMSE, dan koefisien determinasi (R2). Hasil algoritma yang terbaik terhadap nilai di lapangan adalah algoritma Wirasatriya, dengan nilai RMSE = 9,1694 dan MAPE = 15,9984%. Model regresi yang dihasilkan antara data prediksi citra terb","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135916266","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":"Growth Performance of Scalloped Spiny Lobster (Panulirus homarus) Given Artificial Feed Based on Chicken Eggs Hatching Waste","authors":"Natasya Cahya Okta, F. Azhar, Andre Rachmat Scabra, Abdul Syukur, M. Amin, Faturrahman Faturrahman","doi":"10.14710/jkt.v26i2.17609","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17609","url":null,"abstract":"The availability of cheap and high nutritional value artificial feed is a prerequisite for the sustainability of lobster cultivation. In this study, the lobster feed formula was made based on chicken egg hatching waste and maggot flour. The purpose of this study was to determine the performance of scalloped spiny lobsters with artificial feed treatment P1 (70% fish meal + 0% hatching waste), P2 treatment (50% fishmeal + 20% hatching waste), P3 treatment (30% fishmeal + 40% hatching waste), and P4 treatment (10% fishmeal + 60% hatchery waste). This study used lobster seedlings with a size of 1.5 - 3.5 cm which were kept for 60 days. Lobster performance is measured based on body weight, body length, growth rate, feed conversion, molting and lobster dilution rate. The data were analyzed descriptively by presenting mean, standard deviation, and statistical analysis using Duncan's advanced test. The results of the lobster performance study based on absolute length and weight in the P1 treatment were obtained 1.22±0.05 and 1.03±0.21; on P2 treatment obtained 1.31±0.16 and 1.16±0.09; P3 treatment obtained 1.37±0.37 and 1.47±0.13; and P4 treatment obtained 0.82±0.18 and 0.9±0.22. The calculation of the specific growth rate in the P1 treatment was obtained 0.56±0.09, the P2 treatment was obtained 0.69±0.21, the P3 treatment was obtained 0.73±0.16, and the P4 treatment was obtained 0.56±0.24. The ratio of feed conversion and lobster dilution shows a tendency to decrease as the concentration of chicken hatching waste increases. The growth performance of scalloped spiny lobsters fed with chicken egg hatching waste-based feed is quite good up to a concentration of 40% and if more than that will reduce the growth performance of lobsters. ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46757094","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":"Biological Aspects and Feeding Habits of Spinetail Devil Ray (Mobula mobular) landed in the Palabuhanratu Nusantara Fishing Port","authors":"Fahira Anggi Novyanti, S. Oktaviyani, M. R. Ismail, Yuniarti M.S., Alexander M. A. Khan","doi":"10.14710/jkt.v26i2.16068","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.16068","url":null,"abstract":"Optimal management of aquatic resources requires a good understanding of the biological aspects and other information related to these resources. This study was conducted to determine the biological aspects and feeding habits of Mobula mobular landed in the Palabuhanratu Nusantara Fishing Port. The research was conducted from September 2021 to May 2022. Data collected through a direct survey that included aspects of biology, stomach contents and information on fishing grounds. It was recorded that 21 individuals of M. mobular landed in the area during the study period. According to the Chi-Square test, the sex ratio between females and males is balanced with the growth pattern of M. mobular was negatively allometric. The male of M. mobular was generally found as immature individuals. The prey items identified in the stomachs belong to five groups: decapods, copepods, gastropods, Polychaeta, and others. Decapods were the most important prey (Index of Relative Importance 99,54%), while the other prey groups were only as complementary food. M. mobular is categorized as a plankton feeder. The fullness index value was 23.8%, while the vacuity index was 76.2% and categorized as relatively low fed. M. mobular is classified as an omnivorous animal that tends to be carnivorous with an animal preference with a trophic value of level 3.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48025015","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":"Biologi Reproduksi Lalosi Merah (Pterocaeasio tile, Cuvier 1830) Hubungannya Dengan Selektivitas Jaring Insang Lingkar","authors":"Haruna Haruna, Agustinus Tupamahu, Reskyta Maharani Aprillia","doi":"10.14710/jkt.v26i2.17457","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17457","url":null,"abstract":"Intensive and massive fishing exploitation of various reef fish resources occurs in coastal areas, including the Pteriocaesio tile (dark-banded fusilier). This study was conducted due to a lack of information, including size distribution, length of first captured (Lc), length at first mature (Lm), and the selectivity of the mesh size for Pteriocaesio tile caught in the Huamual Belakang waters. The data collection was conducted from September to December 2022. The experimental fishing method was conducted by operating one unit of encircling gillnet consisting of eight panels, each consisting of four mesh net units of 1.75 inch and 2.0 inch, installed randomly. Samples of fish caught for each actual fishing were measured for total length. The reproductive aspect used 10-15% of fish samples per trip. The fish were measured for total length and body weight, and dissected to determine the sex and gonad maturity level and weight. The catches with encircling gillnets were dominated by the Caesionidae family, consisting of Pteriocaesio tile at 74.73%, Pterocaesio chrysozona at 6.80%, and caesio caerulaurea at 6.41%. The size distribution of the total length of Pteriocaesio tile was 15.0 – 27.3 cm. The average length first caught in a  1.75-inch mesh was 21.4 cm, and 22.5 cm for the 2.0-inch mesh. The length at first mature was 18.6 cm for the female, and 20.6 cm for the male. The gillnet selectivity obtained 50% chance of being caught in the mesh size of 1.75 inches was 18.8 cm, and 21.9 cm in the mesh size of 2.0 inches. The status of the resource utilization of Pteriocaesio tile was in good condition (Lc > Lm). Nevertheless, the use of the 1.75-inch mesh size indicated recruitment overfishing   Eksploitasi penangkapan terjadi secara intensif dan masif di wilayah pesisir terhadap berbagai sumberdaya ikan karang termasuk ikan Pteriocaesio tile (dark-banded fusilier). Penelitian ini dilakukan karena masih minimnya informasi meliputi; distribusi ukuran, ukuran ikan pertama kali tertangkap, ukuran ikan pertama kali matang gonad, dan selektivitas ukuran mata jaring Pteriocaesio tile yang tertangkap di perairan Huamual Belakang. Pengumpulan data dilakukan pada bulan September sampai Desember 2022. Metode experimental fishing dilakukan dengan mengoperasikan satu unit jaring insang lingkar terdiri dari 8 panel ukuran mata jaring 1,75 inci dan 2,0 inci yang dipasang secara acak. Sampel ikan hasil tangkapan setiap aktual atau trip penangkapan diukur panjang total, untuk aspek reproduksi menggunakan 10-15% sampel ikan setiap trip, ikan diukur panjang total, berat tubuh dan dibedah untuk mengetahui jenis kelamin, tingkat kematangan gonad maupun berat gonad.  Hasil tangkapan jaring insang lingkar di dominasi family Caesionidae masing-masing jenis ikan Pteriocaesio tile 74,73%, Pterocaesio chrysozona 6,80% dan Caesio caerulaurea 6,41%. Distribusi ukuran panjang total ikan Pteriocaesio tile 15,0-27,3 cm. Ukuran ikan rata-rata pertama kali tertangkap mata jaring 1,75 i","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42731063","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":"Effect of Vitamin C Bioencapsulation in Natural Feed on Protein, Fat, Energy, and Mortality of Milkfish Larvae (Chanos chanos)","authors":"Sri Mulyani, Sutia Budi, Indra Cahyono, Khairiman Khairiman","doi":"10.14710/jkt.v26i2.17969","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17969","url":null,"abstract":"Indications of milkfish larvae problems show lack symptoms of vitamin C in the tissues, which will cause defective bone formation and become an inhibitor factor in growth and mortality. This research aims to investigate the influence of vitamin C bioencapsulation on rotifer and artemia in protein retention, fat, energy, and the cause of death in milkfish larvae (Chanos chanos). The dose of vitamin C used in this study were 0 (control), 50, 100, 150, and 200 mg L-1. The treatment starts from D-1 to D-30 stadia of milkfish larvae, with 30-day maintenance. The density of milkfish larvae utilized is 20 L-1. The protein and fat content of milkfish larvae bodies were measured using a proximate analysis, and the energy content of the feed was measured using a bomb calorimeter. Mortality was observed under the Ministry of Health of Republic Indonesia standard binocular microscope by identifying larvae that died daily in each container. This research shows that vitamin C bioencapsulation in rotifer and artemia affects the retention rate of protein, fat, energy and the cause of milkfish larvae mortality. The dose of vitamin C of 150 and 200 mg L-1 is effective in improving protein, fat, and energy retention, which can minimize the cause of milkfish larvae mortality. The best results are obtained by bioencapsulating Vitamin C on rotifer and artemia with dose of 150 mg L-1.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47420508","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":"Carrageenan Extraction of Kappaphycus alvarezii Seaweed from Nusa Lembongan Waters Using Different Alkaline Treatments","authors":"Ichoun Brawici Dhewang, E. Yudiati, S. Subagiyo, R. Alghazeer","doi":"10.14710/jkt.v26i2.17389","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17389","url":null,"abstract":"Kappaphycus alvarezii is a carrageenan-producing red seaweed that is widely cultivated in Nusa Lembongan waters, Bali, Indonesia. Carrageenan is generally extracted using an alkaline base,. iIn this study three different types of alkali were used to extract carrageenan originating from Nusa Lembongan Waters. This study aims to determine the quality of the extraction. The three alkalis used were KOH, NaOH, Ca(OH)2, and distilled water as a control. The 20 g dried seaweed was weighed, washed with the tap running water, and immersed in 0.15% alkaline solution (KOH, NaOH, Ca(OH)2) as well as distilled water for 24 hrs. Followed by rinsing with running water until pH was neutral. The solution was soaked and heated at 100ºC for 2 hours with a ratio of seaweed and water 1 kg in 20 L, and filtered. The extract was mixed with 1.25% KCI. The carrageenan precipitate was put in the oven at 60-80ºC until dry for 48 hours. The yield test results showed that the use of alkaline Ca(OH)2 resulted in a yield of 29.28% better than alkaline KOH (28.18%) and NaOH (27.7%). Based on the analysis of Fourier Transform Infrared Spectroscopy (FTIR), extraction using alkaline Ca(OH)2 showed functional groups characteristic of iota-carrageenan, whereas using alkaline KOH and NaOH showed functional groups characteristic of kappa-carrageenan.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43113435","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":"Analisis Multivariat pada Struktur Komunitas Mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau","authors":"S. Syahrial, Muhammad Hatta, Chandrika eka Larasati, Arina Ruzanna, Al Muzafri, La Ode Abdul Fajar Hasidu, Windi Syahrian, Zan Zibar","doi":"10.14710/jkt.v26i2.15622","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.15622","url":null,"abstract":"Increasing human activity in all aspects of life has contributed to the decline of mangrove forests, a multivariate analysis study on the structure of the mangrove community was conducted in July 2018 in North Rupat District, Bengkalis Regency, Riau Province with the objective of estimating or assessing the condition of the mangrove community structure. Data on the condition of mangrove vegetation was collected in six observations using line transects and plots measuring 10 x 10 m. Mangrove diversity was analyzed using the Shannon-Weaver and Simpson indexes, and variations in mangrove community the structure was analyzed using clusters, non-metric MDS, ANOSIM, and SIMPER. The study discovered 12 mangrove species in North Rupat District, Bengkalis Regency, Riau Province, which was classified into 6 families based on diversity analysis (H') Shannon Weaver indexes ranging from 01.34 to 01.72 and Simpson indexes ranging from 02.43 to 02.81. Furthermore, the results of the mangrove diversity analysis using multivariate clusters and non-metric MDS were divided into four groups, and while the cluster analysis based on the value of the mangrove density had a similarity of 60%, the variation in the significance of mangrove density was significantly different (R = 0.689, p = 0.000), and the mangrove species that compose varies between stations. Moreover, the trunk diameter of mangrove vegetation in North Rupat District, Bengkalis Regency, Riau Province is dominated by mangrove stands with a trunk diameter of 01.00 - 20.00 cm, with the mangrove vegetation that grows and develops at Stations 2 and 6 being relatively younger than the other stations. Stations 3 and 4 are considered more mature in terms of growth and development.  Peningkatan aktivitas manusia di segala setor kehidupan telah mendorong penurunan hutan mangrove, sehingga kajian analisis multivariat pada struktur komunitas mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau telah dilakukan pada bulan Juli 2018 dengan tujuan untuk mengestimasi atau menilai kondisi struktur komunitas mangrovenya. Data kondisi vegetasi mangrove dikumpulkan pada enam stasiun pengamatan dengan membuat transek garis dan plot yang berukuran 10 x 10 m, kemudian keanekaragaman mangrovenya dianalisis menggunakan indeks Shannon-Weaver dan Simpson, sedangkan variasi struktur komunitas mangrovenya dianalisis berdasarkan cluster, non-metric MDS, ANOSIM dan SIMPER. Hasil kajian menemukan 12 spesies mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau yang tergolong ke dalam 6 famili dengan analisis keanekaragaman (H’) indeks Shannon Weaver berkisar antara 01.34 – 01.72 dan indeks Simpson berkisar antara 02.43–02.81, kemudian hasil analisis keanekaragaman mangrovenya dengan multivariat cluster dan non-metric MDS terbagi atas empat kelompok, sedangkan analisis cluster berdasarkan nilai kerapatan mangrovenya memiliki kemiripan ± 60%, variasi signifikansi kerapatan mangrovenya berbeda nyata (R = 0.689,","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42543497","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":"Bioconcentration of Chromium (Cr) on The Soft Tissue of Mussels (Perna viridis, Linnaeus 1758) in Tambak Lorok Waters, Semarang","authors":"S. Rudiyanti, S. Suryanti, Churun Ain","doi":"10.14710/jkt.v26i2.17563","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17563","url":null,"abstract":"Industrial development provides economic benefits, but also increases the concentration of waste pollution which affects the aquatic environment of Tambak Lorok on the North Coast of Central Java. The existence of this waste will affect the life of the biota in it, such as mussels (Perna viridis). The heavy metal Chromium is the focus of research, considering that its presence in large quantities which accumulates in the human body causes health problems. The aims of the research were to determine the content of heavy metal Cr in the waters, sediments, and soft tissue of mussels, to determine the bioconcentration of heavy metal Cr in mussels, and to determine the tolerable intake of weekly consumption of the mussels cultivated in Tambak Lorok waters. The content of Cr in water samples, sediment, and mussel soft tissue was measured the APHA 3111B-2012 method, US EPA SW-846/3050 B-1996 SM 3111B-2012 method, and SSA method. The calculation of bioconcentration mussels, using the bioconcentration factor and Maximum Tolerable Intake. The heavy metal content of Cr in the water column was 0.015 – 0.025 mg.L-1 (upper the quality standard), in sediment was 25.12 – 28.72 mg.kg-1(lower the quality standard), and in the soft tissue of mussels was 0.155 – 0.265 mg/kg (upper the quality standard). The bioconcentration factor of metal Cr in mussels is classified as low, which is around 10.35 – 14. The maximum tolerable intake for mussels was 6,078 kg/week, it is considered safe for consumption.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46161291","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}