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Jurnal Kelautan Tropis
Published by Universitas Diponegoro
ISSN : 14108852     EISSN : 25283111     DOI : -
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Articles 451 Documents
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Geospatial Modeling of the Nitrate Distribution as an Indicator of Aquatic Fertility in the Lagoon Waters of the Mangrove Information Center (PIM), Pekalongan Zainuri, Muhammad; Suryani, Oda Gracia Ariela; Ismanto, Aris; Handoyo, Gentur; Rifai, Azis; Rochaddi, Baskoro; Endrawati, Hadi; Kusumaningrum, Hermin Pancasakti; Jihadi, Muhammad Shulhan; Hadibarata, Tony
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.24081

Abstract

In the lagoon area of the Mangrove Information Center (PIM), Pekalongan, annual flooding leads to inundation in some land areas, particularly pond areas, lagoons, and residential areas. The area of submergence due to tidal floods in 2020 reached 783.99 hectares. The construction of embankments to the south of the lagoon as protection against flooding has transformed the northern area into a lagoon. Our research, crucial for understanding and managing these environmental changes, aims to determine and analyze the content and distribution of nitrate in the Lagoon Area of Mangrove Information Center Waters, Pekalongan. This was achieved through a thorough process of in situ observations based on purposive sampling at six sampling sites on June 22, 2023. The nitrate distribution data was then interpolated with a 2D current hydrodynamic model, ensuring the most accurate representation of the data. The value of nitrate content in the Mangrove Information Center lagoon ranges between 0.0065-0.1072 mg/L. This distribution pattern, influenced by deposits of mangrove litter, the depth of the lagoon, and water circulation, reflects the accumulation of physical and chemical influences in the waters.
Pemetaan Potensi Karbon Biru pada Kawasan Mangrove di Kabupaten Kayong Utara Raynaldo, Adityo; Saputra, Robin; Zibar, Zan
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20196

Abstract

Distribution and extent of existing mangroves, conditions, and potential for blue carbon are needed to encourage the economy of coastal communities as coastal ecosystem services. Kayong Utara Regency as one of the regencies in the coastal area of West Kalimantan has the potential for mangroves to be utilized by coastal communities but there has been no ecological study of the potential for blue carbon contained therein. This study aims to map the distribution of mangroves and their conditions and to map the spatial distribution of mangrove carbon stocks in the Kayong Utara Regency. The mapping method for the distribution of existing mangroves is carried out using the visual interpretation method by making a certain false-color RGB composite, the distribution of mangroves is identified using nine key elements of image interpretation. Mangrove conditions were analyzed through mangrove cover using the hemispherical photography method. Mapping of carbon stocks was carried out using a linear regression model formulation of several vegetation index variables and carbon stock values from making observation plots, then analyzed spatially. The research results show that the mangrove area in North Kayong Regency is 20,543.40 ha, spread throughout the district. Mangrove conditions consist of the categories rare 3.92%, moderate 53.07%, and dense 43.01%. Tree density (DBH ≥ 10 cm) from 56 survey points ranged from 100 – 2800 individual ha-1 with AGC values ranging from 4.21 – 1375.74 Mg ha-1. The dominant mangrove species found included Avicennia alba, A. lanata, A. marina, Bruguiera parviflora, Excoecaria agallocha, Rhizophora apiculata, R. mucronata, R. stylosa, Xylocarpus granatum. The best linear regression model in this study uses the MDI2 variable with the formulation y = 225.08x – 114.55 and the Pearson correlation value (r) = 0.377. The AGC potential value of the selected model ranges from 0 – 631.92 Mg ha-1 spread with the largest potential value found in Pulau Maya District. Data sebaran dan luasan mangrove eksisting, kondisi dan potensi karbon biru diperlukan untuk mendorong peningkatan ekonomi masyarakat pesisir sebagai jasa ekosistem pesisir yang masih terbatas saat ini. Kabupaten Kayong Utara sebagai salah satu Kabupaten di wilayah pesisir Kalimantan Barat memiliki potensi mangrove yang dimanfaatkan oleh masyarakat pesisir namun belum ada kajian ekologis tentang potensi karbon biru yang terdapat didalamnya. Penelitian ini bertujuan untuk memetakan sebaran mangrove dan kondisjnya serta memetakan distribusi spasial stok karbon mangrove di Kabupaten Kayong Utara. Metode pemetaan sebaran mangrove eksisting dilakukan dengan menggunakan metode interpetasi visual dengan membuat komposit false-color RGB tertentu, sebaran mangrove diidentifikasi dengan menggunakan sembilan unsur kunci interpetasi citra. Kondisi mangrove dianalisis melalui tutupan mangrove dengan metode hemispherical photography. Pemetaan stok karbon dilakukan dengan formulasi model regresi linear beberapa variabel indeks vegetasi dan nilai stok karbon dari pembuatan plot pengamatan, kemudian dianalisis secara spasial. Hasil penelitian menunjukkan luasan mangrove di Kabupaten Kayong Utara sebesar 20.543,40 ha, tersebar di seluruh Kecamatan. Kondisi mangrove terdiri atas kategori jarang 3,92%, sedang 53,07% dan rapat 43,01%. Kerapatan pohon (DBH ≥ 10 cm) dari 56 titik survey berkisar antara 100 – 2800 ind ha-1 dengan nilai AGC berkisar 4,21 – 1375,74 Mg ha-1. Spesies mangrove dominan yang ditemukan antara lain Avicennia alba, A. lanata, A. marina, Bruguiera parviflora, Excoecaria agallocha, Rhizophora apiculata, R. mucronata, R. stylosa, Xylocarpus granatum. Model regresi linear yang terbaik pada penelitian ini menggunakan variabel MDI2 dengan formulasi y = 225,08x – 114,55 dan nilai korelasi pearson (r) = 0,377. Nilai potensi AGC dari model yang dipilih berkisar antara 0 – 631,92 Mg ha-1 tersebar dengan nilai potensi terbesar terdapat di Kecamatan Pulau Maya. 
Population dynamic of mackerel scad (Decapterus macarellus Cuvier, 1833) in the Timor Sea Herwaty, Susy; Mallawa, Achmar; Najamuddin, Najamuddin; Zainuddin, Mukti
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.21918

Abstract

Mackerel scad (Decapterus macarellus) is a fish resource that contributes to the economic sector for fishermen in the province of East Nusa Tenggara province. Its production has increased every year. This study aims to analyze the parameters of the population dynamics of the mackerel scad. Fish samples were collected at the Oeba Fish Landing Base Kupang from April to June 2020. The data analysis used included size structure analyzed descriptively, age group using the Bhattacharya method, growth parameter values (L∞ and K) based on the von Bertalanffy equation, natural mortality using the Pauly method, and Y/R using the Beverton and Holt method. The results showed that the smallest size of the mackerel scad was 7.8 cm (FL), the largest size was 27.8 cm (FL), the average length was 19.63 cm (FL) ± 4.46, the asymptotic length (L∞) = 38.10 cm (FL), the growth parameter value (K)= 0.51 year-1, t0= -0.2996 year-1, The population consists of two to three age groups.  the total mortality value (Z)= 2.29 year-1, natural mortality (M) = 1.08 year-1, fishing mortality (F)= 1.22 year-1 and  exploitation rate (E)= 0.53 year-1. The actual Y/R value was 0.057 and the relative Y/R was 0.060 grams recruit-1
Potensi Perikanan di Perairan Selatan Yogyakarta Ditinjau dari Sebaran Klorofil-a, Suhu Permukaan Laut, dan Particulate Organic Carbon Berbasis Citra Satelit Aqua MODIS Sarifah, Almunatus; Pratikto, Ibnu; Suryono, Chrisna Adhi
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.22269

Abstract

Productivity and fertility of the waters can be assessed by the distribuion of chlorophyll-a. sea surface temperature (SST), and particulate organic carbon (POC). The data of these three parameters from remote sensing can be used to determine the fisheries potential as the presence of fish dynamic following environmental conditions. The aim of this research is to determine fisheries potential based on chlorophyll-a. SST, and POC from Aqua MODIS Level 3 satellite imagery in the Selatan Yogyakarta Waters. This study uses a Geographic Information System (GIS) approach by extracting chlorophyll-a, SST, and POC values from Aqua-MODIS satellite imagery with a resolution of 4 km and overlay method from January to December 2023. The results identified the highest concentration of chlorophyll-a in November at 27,60 mg/m3 and the lowest in January and February at 0,06 mg/m3. The highest sea surface temperature (SST) occurred in March at 31,04 oC and the lowest in September at 22,60 oC. The highest POC concentration was in November at 863 mg/m3 and the lowest in January at 26 mg/m3. The areas with good fisheries potential throughout the months are from coastal area to 4 nautical miles. These results are then compared with interviews conducted with fishermen from the PPP Dislautkan DIY in Sadeng, Gunungkidul. The months estimated to have good fisheries potential are between October and December 2023, in line with the fish catch production data of DIY Province in 2023 obtained from Dinas Kelautan dan Perikanan (DKP) DIY..   Produktivitas dan kesuburan perairan dapat dilihat dari sebaran klorofil-a, suhu permukaan laut (SPL), dan particulate organic carbon (POC). Data ketiga parameter tersebut dari penginderaan jauh dapat digunakan untuk menentukan potensi perikanan karena keberadaan ikan bersifat dinamis mengikuti kondisi lingkungan. Tujuan penelitian ini adalah untuk menentukan potensi perikanan berdasarkan data klorofil-a, SPL, dan POC dari citra satelit Aqua MODIS di Perairan Selatan Yogyakarta. Penelitian ini menggunakan pendekatan Sistem Informasi Geografis (SIG) dengan mengekstraksi nilai klorofil-a, SPL, dan POC dari citra satelit Aqua-MODIS Level 3 resolusi 4 km dan metode overlay dari Bulan Januari-Desember 2023. Hasilnya diidentifikasi konsentrasi klorofil-a tertinggi pada November sebesar 27,60 mg/m3 dan terendah pada Januari dan Februari sebesar 0,06 mg/m3. Nilai suhu permukaan laut (SPL) tertinggi di Maret sebesar 31,04 oC dan SPL terendah pada September yaitu 22,60oC. Konsentrasi POC tertinggi pada November sebesar 863 mg/m3 dan terendah pada Januari sebesar 26,18 mg/m3. Wilayah yang memiliki potensi perikanan baik sepanjang bulan yaitu di peisisr pantai hingga 4 mil laut. Hasil ini kemudian dibandingkan dengan wawancara nelayan PPP Dislautkan DIY di Sadeng, Gunungkidul. Bulan yang diestimasi memiliki potensi perikanan yang baik antara Oktober-Desember 2023 sesuai dengan data produksi hasil tangkapan ikan Provinsi DIY Tahun 2023 yang diperoleh dari Dinas Kelautan dan Perikanan (DKP) DIY. 
Karakteristik Estuari di Muara Angke pada Musim Timur Radjawane, Ivonne Milichristi; Mughny, Grahadi Pandu; Napitupulu, Gandhi
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20679

Abstract

Estuaries are important transitional environments between freshwater and marine ecosystems. These areas are often centers of economic activity, environmental sustainability and natural resources. In this context, this study aims to investigate the estuary characteristics of Muara Angke, particularly in terms of changes in water level, salinity, and the influence of river flow in the face of changing tidal conditions. Research on estuary characteristics in one of the Ciliwung River Estuaries was conducted on August 9-10, 2015. The research area is Muara Angke, North Jakarta, DKI Jakarta Province. The measurement point consists of 11 stations starting from point A1 at the mouth of the estuary to point A11 which is the farthest station point from the estuary, with a distance of 200 m between stations. Oceanographic parameter measurements were made at 3 depths (0.2h; 0.6h and 0.8h) with 4 tidal conditions (towards the tide, tide, towards the ebb and ebb). Angke Estuary has a diurnal tidal type with a range of water levels between 0.98 m - 1.41 m and an average discharge of 7.75 m3/s during the measurement time. The results showed that the Angke Estuary has a partially mixed estuary type with salinity values at the surface increasing relatively small to the middle layer and also the bottom layer decreasing relatively small to the middle layer which indicates vertical mixing from the bottom to the surface. In addition, based on the estuary numbers (  = 0.337;  = 0.279;  = 0.593), there is a freshwater flow that is smaller or equal to the tidal influence. Salinity intrusion occurs as far as 2 km when conditions are towards high tide and  high tide. Estuari merupakan lingkungan peralihan yang penting antara ekosistem air tawar dan laut. Daerah ini sering kali menjadi pusat kegiatan ekonomi, keberlanjutan lingkungan, dan sumber daya alam. Dalam konteks ini, penelitian ini bertujuan untuk menginvestigasi karakteristik estuari Muara Angke, khususnya dalam hal perubahan tinggi muka air, salinitas, dan pengaruh aliran sungai dalam menghadapi perubahan kondisi pasang surut. Penelitian mengenai karakteristik estuari di salah satu Muara Sungai Ciliwung telah dilakukan pada tanggal 9-10 Agustus 2015. Daerah penelitian adalah Muara Angke, Jakarta Utara Provinsi DKI Jakarta. Titik pengukuran terdiri dari 11 stasiun mulai dari titik A1 yang berada di mulut muara sampai dengan titik A11 yang merupakan titik stasiun terjauh dari muara, dengan jarak antar stasiunnya adalah 200 m. Pengukuran parameter Oseanografi dilakukan terhadap 3 kedalaman (0,2 ; 0,6  dan 0,8 ) dengan 4 kondisi pasang surut (menuju pasang, pasang, menuju surut dan surut). Muara Angke memiliki tipe pasang surut diurnal dengan kisaran tinggi muka air antara 0,98 m – 1,41 m dan debit rata-rata sebesar 7,75 m3/s selama waktu pengukuran. Hasil penelitian menunjukan bahwa Muara Angke memiliki tipe estuari tercampur sebagian (partially mixed) dengan nilai salinitas di permukaan yang bertambah relatif kecil ke lapisan tengah dan juga lapisan dasar yang berkurang relatif kecil ke lapisan tengah yang menandakan adanya percampuran secara vertikal dari dasar ke permukaan. Selain itu berdasarkan bilangan-bilangan estuari (  = 0,337;  = 0,279;  = 0,593) menunjukan adanya aliran air tawar yang besarnya lebih kecil atau sama dengan pengaruh pasang surutnya. Intrusi salinitas terjadi sejauh 2 km ketika kondisi menuju pasang dan pasang. 
Species Diversity of Gastropods in the Mangrove Forest of Pangpang Bay Ijen Geopark, Banyuwangi Indonesia Setiawan, Rendy; Wimbaningrum, Retno; Sulistiyowati, Hari; Siddiq, Arif Mohammad; Rani, Cynthia; Baraas, Abdillah
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22471

Abstract

Gastropods are invertebrate animals from the phylum Mollusca which have soft bodies and most of them have shells. The Pangpang Bay mangrove forest has a muddy substrate type and contains a lot of organic matter as a food source. This research was conducted in October - December 2022 at the Pangpang Ijen Geopark Bay. The area of the research area is about 900 meters2 with a total plot size of 1x1 m totaling 99 plots. The gastropod data collection method uses the systematic plot transect method. The recorded data contains the local name/type/type code, the number of species, and the number of individuals of each type. Data on abiotic environmental factors which include temperature, pH, and salinity are determined by the range of values and the type of substrate. Further data analysis was carried out by determining the species composition of gastropods by calculating the Shannon-Wiener (H') species diversity index. The results showed that there were 20 types of gastropods with members from 11 genus and 7 families. The results showed that the gastropod diversity index at the study site is in the medium category with a value of 1.95. The conclusion of this study is the diversity of species found in the mangrove forest of Pangpang Ijen Geopark Bay as many as 20 species. The value of diversity of gastropod species in the Pangpang Ijen Geopark Bay mangrove forest is in the moderate category because there are quite a lot of species found and only one species dominates.
Vulnerability Assessment of Mangroves using the Coastal Vulnerability Index in Timbulsloko Village, Sayung, Demak Nila Munana; Rudhi Pribadi; Chrisna Adhi Suryono
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.20156

Abstract

The ongoing global warming is causing climate change in several regions of Indonesia, resulting in various impacts. One of these impacts affects coastal areas, namely, the rise in sea levels. The mangrove ecosystem is one of the coastal ecosystems with a crucial role in both ecological and economic aspects of life. This ecosystem is more susceptible to damage due to climate change and human activities. The purpose of this research is to determine the vulnerability level of the mangrove ecosystem, thereby serving as a reference for the rehabilitation of the mangrove ecosystem in Timbulsloko Village. The method used is descriptive exploratory, involving direct field measurements of oceanographic variables, such as salinity, substrate, and tidal data. The analysis employed was the Coastal Vulnerability Index (CVI) with scores divided into three categories: low, moderate, and high, with respective scores ranging between 0.45-2.31, 2.32-4.62, and 4.63-6.93. An analysis of the mangrove substrate was also conducted to determine the existing substrate types in Timbulsloko Village. The obtained results indicate that the salinity around the mangrove ranges from 29-30 ppt, the substrate type is characterized as mud, and the average tidal height is 1.5 m with a mixed leaning towards diurnal single tide. As a result, the vulnerability index value of the mangrove ecosystem in Timbulsloko Village is considered moderate, with a score of 3. The level of mangrove vulnerability is moderate, but sustainable management of the mangrove ecosystem is still required for the future. 
Effect of Liquid Fertilizer on Seedling Enhalus acoroides Seeds (Linnaeus f.) Royle 1839 (Fam: Hydrocharitaceae) Chamidy, Ardian Nurrasyid; Widianingsih, Widianingsih; Munasik, Munasik; Riniatsih, Ita; Susanto, AB
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.21066

Abstract

The decrease in seagrass coverage and ecosystem harm to seagrass meadows is an annual occurrence resulting from both natural and human activities.  Seagrass seeding has been deemed an effective restoration method, but its application is restricted by suboptimal environmental conditions and constraints associated with directly planting seagrass seeds in their natural habitat. The influence of environmental parameters, particularly nutrients, significantly affect on seagrass seed survival. NPK liquid fertilizer is commonly used in aquatic plants and is readily accessible in the market. It serves as a crucial source of macronutrients for seagrass. This study investigates the impact of different concentrations of NPK liquid fertilizer on the survival rate, growth, and chlorophyll, a content of E. acoroides seedlings. The study took place between March and May 2023 at the marine biology laboratory of the marine science study program at Diponegoro University's Faculty of Fisheries and Marine Science. According to the Manova statistical test, the NPK liquid fertilizer had an impact on the growth rate, biomass, and chlorophyll-a. The seagrass seeding container of E. acoroides treated with a liquid fertilizer concentration of 4.5 ml/100l exhibited the highest average growth rate of 0.29 cm/day and a chlorophyll-a value of 12.395 mg/g, with a survival rate of 100%. Causal connections between statements ensure logical construction. In contrast, seedlings without liquid fertilizer treatment showed the lowest growth rate of 0.19 cm/day and chlorophyll-a values of 5.169 mg/g, with a survival rate of 85.19%. Technical term abbreviations such as 'cm/day' and 'mg/g' are explained when first used to ensure clarity. Based on these findings, using liquid fertilizer with a concentration of 4.5 ml/l exhibits potential for restoring seagrass ecosystems. 
Pengaruh Sedimentasi terhadap Tutupan Terumbu Karang di Perairan Arfai, Manokwari Indonesia Kolibongso, Duaitd; Alfani, Hermina Gloria; Loinenak, Frida A.; Sembel, Luky; Purba, Gandi Y S
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22130

Abstract

Sedimentation adversely affects corals by impeding recruitment, hindering growth, and inducing stress, ultimately leading to degradation. This study aims to ascertain the correlation between sedimentation and coral cover. Five stations were sampled in Arfai waters in May 2023, with sedimentation rates measured using traps over 14 days. Coral reef conditions were assessed via the Point Intercept Transect (PIT) method, revealing a 'good' coral cover of 51%, dominated by Acropora submassive (ACS), Acropora branching (ACB), and Coral branching (CB). Sedimentation rates ranged from 6.26 to 33.92 mg/cm²/day, with impacts categorized from mild to moderate and moderate to heavy. Analysis confirms sedimentation's influence on coral reef life. Despite its significance for management strategies, long-term studies tracking coral reef structure and function in response to sediment influx are lacking. Further research on coral reef recovery post-sediment exposure is imperative.  Sedimentasi memengaruhi karang dengan menghambat rekruitmen, menghambat pertumbuhan, dan menyebabkan stres, yang akhirnya menyebabkan degradasi. Studi ini bertujuan untuk mengetahui hubungan antara sedimentasi dan tutupan karang. Lima stasiun diambil sampelnya di perairan Arfai pada Mei 2023, dengan tingkat sedimentasi diukur menggunakan perangkap selama 14 hari. Kondisi terumbu karang dinilai melalui metode Point Intercept Transect (PIT), yang mengungkapkan tutupan karang 'baik' sebesar 51%, didominasi oleh Acropora submassive (ACS), Acropora branching (ACB), dan Coral branching (CB). Tingkat sedimentasi berkisar dari 6,26 hingga 33,92 mg/cm²/hari, dengan dampak yang dikategorikan dari ringan hingga sedang dan sedang hingga berat. Analisis menegaskan pengaruh sedimentasi terhadap kehidupan terumbu karang. Meskipun penting untuk strategi pengelolaan, studi jangka panjang yang melacak struktur dan fungsi terumbu karang dalam menanggapi masukan sedimen masih kurang. Penelitian lebih lanjut tentang pemulihan terumbu karang setelah paparan sedimen sangat penting.
Kontaminasi Logam Cr dan Fe pada Organisme Benthik Laut yang Ditangkap di Perairan Jawa Tengah Chrisna Adhi Suryono; Agus Indardjo
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.18165

Abstract

Coastal areas of Semarang and Tegal, there are several industries that use metal materials. These activities will have an impact on the marine ecosystem, especially the biota that lives in it. The research aims to determine the metal contamination of Chromium (Cr) and Iron (Fe) in benthic biota in the waters of Semarang and Tegal, Central Java. Analysis of Cr and Fe concentrations in biota tissues using ICPMS. The results of analysis of Cr and Fe metals in the biota tissues of white shrimp (P. Merguensis), crab (P. pelagicus), coocle (A. inaequivalvis) and gastropods (H. ternatanus) found Cr and Fe metals in the biota tissues. The concentration of Cr metal in biota found in Semarang ranges from 0.211– 0.235 ppm, while in Tegal it ranges from 0.1–0.218 ppm. Fe metal concentrations from Semarang biota ranged from 0.718 – 0.909 ppm, while those from Tegal were 0.733 – 1.429 ppm. The concentrations of Cr and Fe metals in each biota and research location showed no differences, while Fe metals showed differences.  Pesisir kota Semarang dan Tegal terdapat beberapa industri yang menggunakan bahan logam.  Aktifitas tersebut akan berdampak pada ekosistem laut terutama biota yang hidup didalamya.  Penelitian bertujuan mengethui kontaminansi logam Kromium (Cr) dan Besi (Fe) pada biota benthik di perairan Semarang dan Tegal Jawa Tengah.  Analisa konsentrasi Cr dan Fe dalam jaringan biota menguunakan ICPMS.  Hasil analisa logam Cr dan Fe dalam jaringan biota udang putih (P. Merguensis), rajungan (P. pelagicus), kerang bulu (A. inaequivalvis) dan gastropoda (H. ternatanus) ditemukan logam Cr dan Fe dalam jaringan biota.  Konsentrasi logam Cr pada biota yang ditemukan di Semarang berkisar 0,211 – 0,235 ppm, sedangkan di Tegal berkisar 0,1 – 0,218 ppm.  Konsentrasi logam Fe dari biota Semarang berkisar antara 0,718 – 0,909 ppm, sedangkan yang berasal dari Tegal 0,733 – 1,429 ppm.  Konsentrasi logam Cr dan Fe pada setiap biota dan lokasi penelitian menunjukan tidak adanya perbedaan sedangkan logam Fe menunjuakn adanya perbedaan.

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