Jurnal Kelautan Tropis最新文献

{"title":"The Composition of Portunus pelagicus on the Fishing Ground Area of Danasari Waters, Pemalang Regency","authors":"Sri Redjeki, Ria Azizah Tri Nuraini, H. Endrawati","doi":"10.14710/jkt.v26i2.18825","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.18825","url":null,"abstract":"Blue swimming crab (Portunus pelagicus) is one of the most economically valuable marine products in Indonesia. The crabs productivity was generally still dependent on the population in the wild. Danasari Village is one of the main crab producers in Pemalang Regency. The daily fishing crab activities by fisherman direct an impact on decreasing of the natural crabs resources. This study determined the crabs composition in the fishing ground where usually spotted by the Danasari crab fisherman. This research obtained the information of a composition of female and male crabs, carapace width distribution, growth characterized, and the egg-berried female number. This study conducted on May to July 2022. The result in this research was a male crabs were dominated than females. The carapace width was generally amount 92-112 mm, while the growth characteristic of blue swimming crabs was negative allometric. The female crab gonad maturity was dominated by 2nd level gonad maturity, while the egg-berried female crabs were found 21 crabs totaled from 14 spot fishing grounds. Based on the carapace width distribution, there are a lot of blue swimming crab with undersized in shallow-depth fishing sites, while the crab size mostly above 100 mm already found at each spot in this research. The highest egg-berried female percentage was found at spot 7th and 13rd, where the female crabs at 7th spot were bigger carapace than at 13rd spot areas. These results indicated that crab resources in Danasari Waters and surround area were indicated potentially overfished, proven with undersized berried-female crabs. The management efforts will conduct an environmentally friendly fishing gear, regarding the policy of ministry regulating as to keep crab resources sustainable. In addition, scheduling rules for fishing activities can also be tested to be applied.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44664173","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":"Kandungan Klorofil-a dan Karotenoid Pada Eucheuma cottoni yang Dibudidayakan Kedalaman Berbeda di Teluk Cina Pulau Lemukutan","authors":"Sukal Minsas, Aldhea Rachma Nanda, S. Nurdiansyah, Nora Idiawati, Sepridawati Siregar","doi":"10.14710/jkt.v26i2.15950","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.15950","url":null,"abstract":"Seaweed is one of the low-level plant species in the algae group that lives in water which carries out the process of photosynthesis and requires light. The purpose of this study was to see the content of chlorophyll-a and carotenoids at different depths and to determine the correlation between the content of chlorophyll-a and carotenoids with their physical and chemical parameters. This research was conducted in the waters of the Chinese Bay of Lemukutan Island. The method used in this cultivation is floating cages. The benefit of this research is to determine the optimal content of chlorophyll-a and carotenoids, as well as to provide information that can be studied in the Health and Pharmaceutical Sections. Seaweed cultivation is carried out for 50 days from February to April 2022 on Lemukutan Island. Eucheuma cottoni seaweed was cultivated at a depth of 30 cm, 60 cm and 90 cm. Measurement of chlorophyll-a and carotenoid content was carried out in the laboratory using a spectrophotometer and analyzed using ANOVA on SPSS. This study found that the chlorophyll-a content at a depth of 30 cm was 2.209 mg/g, at a depth of 60 cm was 1.706 mg/g, and at a depth of 90 cm was 1.970 mg/g. As for the carotenoid content, at a depth of 30 cm, it was 0.281 mg/g, at a depth of 60 cm, it was 0.275 mg/g and at a depth of 90 cm, it was 0.337 mg/g.  Rumput laut merupakan salah satu jenis tumbuhan tingkat rendah pada golongan alga yang hidup di air yang melakukan proses fotosintesis dan memerlukan cahaya. Tujuan dari penelitian ini adalah untuk melihat kandungan klorofil-a dan karotenoid terhadap kedalaman yang berbeda dan mengetahui korelasi antara kandungan klorofil-a dan karotenoid dengan parameter fisika dan kimianya. Penelitian ini dilakukan di perairan Teluk Cina Pulau Lemukutan. Metode yang dipakai dalam budidaya ini yaitu keramba apung. Manfaat dari penelitian ini adalah untuk mengetahui kandungan klorofil-a dan karotenoid yang optimal, serta memberikan informasi yang dapat dikaji dibagian Kesehatan dan farmasi.  Budidaya rumput laut ini dilakukan selama 50 hari dari bulan Februari-April 2022 di Pulau Lemukutan. Rumput laut Eucheuma cottoni dibudidayakan pada kedalaman 30 cm, 60 cm, dan 90 cm. Pengukuran kandungan klorofil-a dan karotenoid dilakukan di laboratorium menggunakan alat spektofotometri dan dianalisis menggunakan ANOVA pada SPSS. Penelitian ini mendapatkan kandungan klorofi-a pada kedalaman 30 cm yaitu 2,209 mg/g, kedalaman 60 cm yaitu 1,706 mg/g, dan kedalaman 90 cm yaitu 1,970 mg/g. Sedangkan untuk kadungan karotenoid yaitu pada kedalaman 30 cm yaitu 0,281 mg/g, kedalaman 60 cm yaitu 0,275 mg/g dan kedalaman 90 cm 0,337 mg/g.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41825910","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":"Kepiting Genera Scylla di Pesisir Kota Langsa: Distribusi, Dimensi Tangkapan Alami dan Analisis Bioekonominya","authors":"Muhammad Jamil, A. Putriningtias, Silvia Anzhita, Helmy Akbar, S. Syahrial, Hanisah Hanisah, T. Faisal, Sorbakti Sinaga","doi":"10.14710/jkt.v26i2.17780","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17780","url":null,"abstract":"A study of the Scylla genera of crabs was conducted in May in five villages in Langsa City to know their distribution, dimensions of natural catch, and bioeconomic analysis. The method used was the accidental sampling of 30 respondents. Then the information was collected on the demographics and characteristics of the respondents as well as the distribution and dimensions of the Scylla genera crab catch. Respondents indicated that the Scylla genera crabs were distributed in 12 villages, namely Cinta Raja Village, Sungai Lueng, Alue Pineung Timue, Kapa, Lhok Banie, Simpang Lhee, Seuriget, Matang Seulimeng, Sungai Pauh, Kuala Langsa, Sungai Pauh Pusaka, Sungai Pauh Firdaus, and Sungai Pauh Tanjong. The highest catch composition was 4 kg/trip (40%) and the sizes of crabs were all sizes (100%). Furthermore, the dominant duration of the profession of crab catcher is 4 – 6 years (37%) with the predominant age of a crab catcher being 30 – 44 years (53%). The results of the bioeconomic analysis show that the Scylla crab fisheries in Langsa City are still profitable because any increase in catch costs does not reduce total income at all.   Kajian kepiting genera Scylla dilakukan pada bulan Mei di 5 desa Kota Langsa dengan tujuan untuk mengetahui distribusi, dimensi tangkapan alami dan analisis bioekonominya. Metode yang digunakan adalah accidental sampling pada 30 responden, kemudian informasi yang dikumpulkan mengenai demografi dan karakteristik responden serta distribusi dan dimensi penangkapan kepiting genera Scylla. Responden menunjukkan bahwa kepiting genera Scylla terdistribusi di 12 desa yaitu Desa Cinta Raja, Sungai Lueng, Alue Pineung Timue, Kapa, Lhok Banie, Simpang Lhee, Seuriget, Matang Seulimeng, Sungai Pauh, Kuala Langsa, Sungai Pauh Pusaka, Sungai Pauh Firdaus dan Sungai Pauh Tanjong dengan komposisi tangkapan tertingginya adalah 4 kg/trip (40%) dan ukuran kepiting genera Scylla yang diambil adalah semua ukuran (100%). Selanjutnya lamanya profesi sebagai penangkap kepiting yang telah dijalani dominannya adalah 4 – 6 tahun (37%) dengan usia penangkap kepiting dominannya adalah 30 – 44 tahun (53%). Sementara hasil analisis bioekonomi memperlihatkan bahwa kondisi perikanan tangkap kepiting genera Scylla di Kota Langsa masih menguntungkan karena setiap kenaikan biaya tangkapan sama sekali tidak menurunkan total pendapatan.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44403281","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":"Vegetation Analysis as Indicator of Mangrove Degradation Level in Keboromo Village, Tayu","authors":"M. A. Tharieq, A. Bambang, L. Wardhani, Sri Redjeki, R. Pribadi","doi":"10.14710/jkt.v26i2.17575","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17575","url":null,"abstract":"Mangrove degradation is one of the most common issues in the coastal areas of Java, which can cause ecological impacts and even disadvantage for local community. The mangrove forest degradation can be identified based on the vegetation analysis results, which could potentially contribute to the mangrove ecosystem management and rehabilitation programs in the coastal areas. Mangroves in Keboromo Village was the rehabilitation and cultivation area, but often get damaged by ocean waves. This study aims to determine the ecological and vegetation conditions of mangrove ecosystems consist of species composition, density, canopy cover, tree height, and environmental parameters were held in February 2023. The method used was direct observation using transect quadrants of 10x10 m2. The average mangrove density of all observation stations was 3.425 individuals/ha for the tree category, 575 individuals/ha for the sapling category, and 250 individuals/ha for the seedling category. The average percentage of canopy cover was 78.41%. The average height of mangrove trees at all stations is 4.15 m. The environmental parameters were still compatible with the water quality standard for biota and mangrove life. The mangrove forest degradation level based on standard criteria and guidelines for determining mangrove degradation is categorized as low, indicated by mangrove density >1500 individuals/ha and canopy cover >75%. Poor conditions were measured for sapling and seedling densities, which may be caused by environmental factors unsupportive for mangrove regeneration. Based on the results of mangrove vegetation analysis in Keboromo Village, it can state the mangrove ecosystem condition is good. However, management programs are needed to keep the mangroves sustainable.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45242170","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":"Immune Profile of Litopenaeus vannamei in Monoculture and IMTA Ponds System","authors":"C. A. Suryono, E. Yudiati, N. Azhar","doi":"10.14710/jkt.v26i2.18428","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.18428","url":null,"abstract":"Integrated Multi Trophic Level (IMTA) is identified as the integrating culture of multi-species in one area. The effectiveness of space and feed is the main aspect from this point. The disease and health of shrimp management on shrimp production including immune boosters plays a critical aspect. The aim of this research is to determine and analyze the Litopenaeus vannamei immune system in different culture systems, namely polyculture (IMTA) and monoculture. Alginate was applied as supplementation diet by oral administration. The cellular and humoral immune parameters ie. Total hemolymph Count (THC), Phagocyte Activity (PA), Phagocyte Index (PI), Phenoloxidase activity (PO), and Superoxide dismutase activity (SOD) were assessed, monthly. A completely randomized design (CRD) with two treatments (IMTA and monoculture, and four replications in 500 m2 pond area was conducted. In the third month, THC and PA of shrimp from the monoculture pond resulted in significant differences (p<0.05) compared to polyculture (IMTA). SOD activity from monoculture is significantly higher (p<0.05) at every sampling period. In PO enzyme activity of shrimps from monoculture pond produced higher results compared to IMTA ponds in the 2nd and 3rd months. It is concluded that L. vannamei monoculture ponds produced higher immune parameters compared to IMTA ponds. The food competition in terms of feed and space from IMTA ponds may affect this fact. Improving the feeding technique is recommended.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45942426","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":"Identification of Sea Level Rise and Land Subsidence Based on Sentinel 1 Data in the Coastal City of Pekalongan, Central Java, Indonesia","authors":"Lessy Andari, D. Sugianto, A. Wirasatriya, Satria Ginanjar","doi":"10.14710/jkt.v26i2.18324","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.18324","url":null,"abstract":"Sea level rise is a pure impact of climate change. However, the process of studying sea level rise must include local factors that influence such as land subsidence. This study focuses on sea level rise using the CEEMDAN method and land subsidence using the DInSAR method. The location of this research is Pekalongan, Central Java, Indonesia. Tidal data used in this study was for five years, from 2016 to 2020, obtained from the Geospatial Information Agency (BIG). Then the data used to study land subsidence in this study uses Sentinel-1 Synthetic Aperture Radar (SAR) data in 2015, 2016, 2017, and 2020. Pekalongan is an area with mixed diurnal tidal types with Formzahl number 1.7. The sea level rise in Pekalongan is relatively high, at 10.6 mm/year. Then the land subsidence that occurred in Pekalongan is the phenomenon that has the most influence on the occurrence of coastal flooding in the region. The average land subsidence on the coast of Pekalongan is 5.37 cm/year. In addition, the sampling results in 6 areas showed that the most significant decrease was in Area 2, with a decrease of -7.91 cm/year. Based on this research, land subsidence is the most considerable influence on flooding in Pekalongan compared to sea level rise.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48751463","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":"Distribution and Growth Patterns of Crab (P. pelagicus) Based on Environmental Characteristics in Candi Waters, Pamekasan Regency, East Java Province","authors":"Leni Maryani, D. Bengen, I. Nurjaya","doi":"10.14710/jkt.v26i2.17322","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.17322","url":null,"abstract":"Blue swimming crab (BSC) is a fishery commodity with high economic value and great demand in domestic and foreign markets. P. pelagicus swimming crabs are commonly found in Indonesian sea waters, one of the largest contributors to the country's foreign exchange after shrimp and tuna. The high demand for blue crab resources will trigger an increase in fishing efforts. If this is done continuously, it is feared that it could endanger the population structure. Moreover, disrupting the sustainability of blue swimming crab resources in the waters, this study examines the morphometric distribution and growth pattern of P. pelagicus crabs based on environmental characteristics in Candi waters, Pamekasaan Regency. Census sampling was carried out using the census method; the census method was carried out by taking all crab samples caught by fishermen. The results obtained found 33 individual crabs, which were divided into three classes, namely small (<10 cm), medium (>10 cm), and large (>12 cm) size classes. Male crabs dominated the research locations with wider straps than female crabs. The analysis results show that the width-weight relationship's b values are 1.47 (males) and 2.00 (females). In addition, male and female crabs have a positive allometric growth pattern. Blue swimming crabs are often found in habitats with a substrate of dusty mud, high salinity and organic matter.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46321173","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":"Sebaran Material Padatan Tersuspensi Berdasarkan Data Citra Sentinel-2 di Perairan Tanjung Jati, Jepara","authors":"Dhany Ajiperwata, Elis Indrayanti, Baskoro Rochaddi","doi":"10.14710/jkt.v26i2.18468","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.18468","url":null,"abstract":"Tanjung Jati waters are located around the Tanjung Jati Coal Fired Power Plant, Jepara. Burning coal as a fuel for power plant produces fly and bottom ash, which can affect the concentration of total suspended solid (TSS). This study aims to determine the distribution of TSS based on Sentinel-2 level 2A imagery data of Tanjung Jati waters, Jepara. TSS data from field survey, TSS, and Reflectance Remote Sensing (RRS) data from the Copernicus Sentinel site on 25 October 2021 with a resolution of 10 m were used in this study. Processing data using the algorithm of Lemigas, Budhiman, Parwati, Laili, and developing a new algorithm with a regression function method to estimate TSS concentration. The distribution pattern of TSS in Tanjung Jati Waters, Jepara has a high concentration in areas near land and decreases towards the open sea. The Root Mean Square Error (RMSE) value is 2.704 mg/l, it can be concluded that the proposed algorithm is suitable for describing the distribution of TSS concentrations in Tanjung Jati waters, Jepara. Observation of the distribution of TSS can be used for further analysis to determine sedimentation patterns and water quality.  Perairan Tanjung Jati merupakan perairan yang berada di sekitar area PLTU Tanjung Jati, Jepara. Batu bara sebagai bahan bakar untuk kebutuhan PLTU menghasilkan fly dan bottom ash yang dapat mempengaruhi konsentrasi material padatan tersuspensi (MPT) di perairan sekitarnya. Penelitian ini bertujuan untuk mengetahui sebaran MPT di Perairan Tanjung Jati, Jepara berdasarkan data citra Sentinel-2 Level 2A. Data yang digunakan dalam penelitian meliputi data MPT hasil pengukuran lapangan, data MPT dan Reflectance Remote Sensing (RRS) dari situs sentinel copernicus tanggal 25 Oktober 2021, dengan resolusi 10 m. Pengolahan data menggunakan algoritma Lemigas, Budhiman, Parwati, Laili, dan pengembangan algoritma baru dengan metode regresi. Hasil penelitian menunjukkan bahwa pola sebaran MPT di Perairan Tanjung Jati, Jepara memiliki konsentrasi tinggi pada daerah dekat daratan dan semakin berkurang menuju laut lepas. Nilai RMSE sebesar 2,704 mg/l, hal ini menunjukkan bahwa formula algoritma usulan yang diperoleh sesuai untuk menggambarkan sebaran konsentrasi MPT di perairan Tanjung Jati, Jepara. Hasil sebaran MPT ini dapat digunakan dalam analisa lebih lanjut untuk mengetahui pola sedimentasi dan penilaian kualitas air.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45253981","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 Kesesuaian Habitat Peneluran Penyu Sisik (Eretmocheyls imbricata) di Pantai Batu Hitam dan Pantai Bama, Taman Nasional Baluran, Situbondo","authors":"Yusril Zaqi Ubaydillah, D. Yona, R. D. Kasitowati","doi":"10.14710/jkt.v26i2.15733","DOIUrl":"https://doi.org/10.14710/jkt.v26i2.15733","url":null,"abstract":"Hawksbill turtles were observed nesting along the coast of Baluran, mainly at Batu Hitam Beach. The eggs were relocated to a hatchery on Bama Beach, which is a beach where hawksbill turtles have never been seen laying eggs naturally. Referring to the natal homing/philopatry hypothesis, hatchlings that are released on Bama Beach will likely come back to lay eggs in the future. Meanwhile, Batu Hitam Beach is planned to be developed into a tourist area. To preserve this important nesting area, a nesting habitat suitability assessment is needed that can contribute to effective conservation planning and management. This study used observational data to identify the bio-physical characteristics of the beaches and analyzed them using the habitat suitability index (HSI). The parameters observed were the width and slope of the beach, percentage of sand, intensity of light, coastal vegetation, percentage of buildings, and the distance between the nesting beach and the feeding area. There were no significant differences in bio-physical characteristics between the two beaches. Except for beach width, all other parameters are given the same score. Batu Hitam Beach has a slightly wider and steeper beach than Batu Hitam Beach.  Based on the results of an assessment utilizing the habitat suitability index (HSI) for hawksbill nesting sites, the biophysical conditions of Bama Beach and Batu Hitam Beach were assessed as very suitable (>68.86%). Despite Bama Beach's suitability, there have been no reports of hawksbill turtles nesting there. The width of the beach that is too narrow and a lack of coastal vegetation shade are thought to have forced the hawksbill to prefer other locations, such as Batu Hitam Beach.  Penyu sisik teramati bertelur di sepanjang pesisir Baluran, terutama di Pantai Batu Hitam. Telur yang ditemukan dipindahkan ke tempat penetasan di Pantai Bama, pantai yang belum pernah tercatat penyu bertelur secara alami. Merujuk pada hipotesis natal homing/philopatry, tukik yang dilepasliarkan di Pantai Bama dimungkinan akan kembali untuk bertelur di kemudian hari. Di sisi lain, Pantai Batu Hitam rencananya akan dikembangkan menjadi kawasan wisata. Untuk melestarikan habitat peneluran ini, diperlukan penilaian kesesuaian habitat bersarang yang dapat berkontribusi pada perencanaan dan pengelolaan konservasi yang efektif. Penelitian ini menggunakan pendekatan observasional untuk mengidentifikasi karakteristik bio-fisik pantai dan menganalisisnya menggunakan indeks kesesuaian habitat (IKH). Parameter yang diamati adalah lebar dan kemiringan pantai, persentase pasir, intensitas cahaya, vegetasi pantai, persentase bangunan, dan jarak antara pantai peneluran dengan area pakan. Tidak terdapat perbedaan kondisi bio-fisik yang signifikan antara kedua pantai tersebut. Seluruh parameter mendapatkan skor yang sama, kecuali lebar pantai. Pantai Batu Hitam memiliki pantai yang sedikit lebih lebar dan lebih curam daripada Pantai Batu Hitam. Berdasarkan hasil penilaian d","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":"47784372","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 Kandungan Logam Berat Kadmium (Cd) pada Gastropoda Conus spp. di Hamparan Lamun Perairan Pesisir Manokwari, Propinsi Papua Barat","authors":"Randy Imanuel Sandy Karubuy, Jemmy Manan, Emmanuel Manangkalangi, Luky Sembel, Dandi Saleky","doi":"10.14710/jkt.v26i3.15872","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.15872","url":null,"abstract":"Manokwari coastal waters are one of the coastal areas that experience very rapid development of development activities from year to year. This condition allows the input of waste such as heavy metal cadmium (Cd) into the waters of Manokwari. This research was conducted in the coastal area of Manokwari (BLK Beach, Lemon Island, and Tanjung Manggewa) for three months (February-April 2020). The purpose of this study was to describe the concentration of heavy metal cadmium (Cd) in Gastropod Conus on the Manokwari Coast and to determine the relationship between heavy metal content of cadmium (Cd) in Conus with shell size, wet weight, and dry weight. Data analysis includes Atomic Absorption Spectrophotometer (AAS), linear regression, and descriptive analysis. Based on the research results obtained, the average content of cadmium in Conus in Manokwari waters is 0.06-0.22 mg/kg. The heavy metal content in Conus is still below the specified threshold so it is still fit for consumption. The relationship between the heavy metal content of Cd in Conus with shell length, wet weight, and dry weight are positive with the regression equation successively y = -0.065 + 0.002x, y = 0.054 + 0.005x, and y = 0.061 + 0.014x which shows that the content Heavy metal Cd in Conus is influenced by shell length, wet weight, and dry weight. Perairan pesisir Manokwari merupakan salah satu wilayah pesisir yang mengalami perkembangan kegiatan pembangunan yang sangat pesat dari tahun ke tahun. Kondisi ini memungkinkan adanya masukan limbah seperti logam berat kadmium (Cd) ke perairan Manokwari. Penelitian ini dilakukan di wilayah pesisir Manokwari (Pantai BLK, Pulau Lemon, dan Tanjjung Manggewa) selama tiga bulan (Februari-April 2020). Tujuan dilakukannya penelitian ini untuk mendeskripsikan konsentrasi logam berat kadmium (Cd) pada Gastropoda Conus di Pesisir Manokwari serta mengetahui hubungan kandungan logam berat kadmium (Cd) dalam Conus dengan ukuran cangkang, berat basah, dan berat kering. Analisis data meliputi Spektrofotometer Serapan Atom (SSA), regresi linear, dan analisis deskriptif. Berdasarkan hasil penelitian yang didapatkan, kandungan rata-rata kadmium pada Conus di perairan Manokwari yaitu sebesar 0,06-0,22 mg/kg. Kandungan logam berat dalam Conus masih dibawah ambang yang ditentukan sehingga masih layak untuk dikonsumsi. Hubungan antara kandungan logam berat Cd dalam Conus dengan panjang cangkang, berat basah dan berat kering adalah positif dengan persamaan regresi berturut-turut y = -0,065 + 0,002x, y = 0,054 + 0,005x dan y = 0,061 + 0,014x yang menunjukan bahwa kandungan logam berat Cd dalam Conus dipengaruhi oleh panjang cangkang, berat basah dan berat kering.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"168 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":"135916267","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}