57 research outputs found

    CHARACTERISTIC OF SEDIMENT AT LEKOK COASTAL WATERS, PASURUAN REGENCY, EAST JAVA

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    Sedimentation is one of the dynamics that occur in coastal areas to determine the condition of the coast. Lekok coastal water is one of the open water areas that have very fluctuating dynamics in coastal changes. The structural study of sediment distribution conducted in this location is used to provide information about the process of transportation and sedimentation based on the distribution of sediment grain size. This study aims to determine the horizontal grain sediment size in the Lekok coastal waters. This research was conducted at nine sampling points by sampling in the form of primary sediments randomly using the grab sampler method. Furthermore, further analysis is done by the gravimetric method. Based on the results of the study note that sediments characteristic in Lekok coastal water are generally dominated by three types of sediments, namely: sandy loam, loam, and silt loam. Sorting values ​​are in a well-sorted to the moderately well-sorted condition where the sediment conditions are well sorted. The skewness value is skewed positively, where the value indicates a positive skewed sedimentary condition. The value of kurtosis is in the leptokurtic condition where the sediment from station 1 to station 9 is homogeneous.Sedimentasi merupakan salah satu dinamika yang terjadi di kawasan pesisir untuk mengetahui kondisi pantai tersebut. Pesisir perairan Lekok merupakan salah satu kawasan perairan terbuka yang memiliki dinamika perubahan pesisir sangat fluktuatif. Studi sebaran jenis sedimen yang dilakukan secara terstruktur pada lokasi ini digunakan untuk memberikan informasi mengenai proses transportasi dan pengendapan sedimen berdasarkan distribusi ukuran butir sedimen. Penelitian ini bertujuan untuk mengetahui ukuran butir sedimen secara horizontal di pesisir perairan Lekok. Penelitian ini dilakukan pada sembilan titik sampling dengan pengambilan sampel berupa sedimen dasar secara acak dengan menggunakan metode grab sampler. Selanjutnya dilakukan analisis lebih lanjut dengan metode gravimetri. Berdasarkan hasil penelitian diketahui bahwa karakteristik sedimen dalam Pesisir perairan Lekok umumnya didominasi oleh tiga jenis sedimen yaitu: lempung berpasir, lempung dan lempung lanau. Nilai sorting berada dalam kondisi well-sorted hingga kondisi moderately well-sorted di mana kondisi sedimen didominasi dengan well sorted. Nilai skewness berada pada nilai skewed positively dimana nilai menunjukkan hasil positif. Nilai kurtosis berada pada leptokurtic dimana sedimen dari stasiun 1 ke stasiun 9 homogen

    The Potential and Development of Seaweed Cultivation in Lombok: A Review

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    The potential area of Lombok seaweed cultivation is 5490 Ha. The area utilized is 2039.63 Ha. The purpose of this paper is to review the diversity, cultivation activities, production and potential of seaweed to be developed, specifically focusing on aspects of cultivation and production on the island of Lombok, Indonesia. Macroalgae that have been cultivated on Lombok are Kappaphycus alvarezii morphotype brown and green and Gracilaria verucosa. The decline and the amount of uncertainty in production were caused by several problems in seaweed cultivation, weather changes, limited capital for production and decreased quality of seaweed seeds. The species that have the potential to be developed are Sargassum aquifolium, Caulerpa sp., Ulva sp., Eucheuma spinosum, and Gelidium sp. Development Locations are located throughout the waters in the shape of a bay and are by the stipulated water utilization spatial plan. Developing seaweed aqua tourism and institutional arrangements related to seaweed production is necessary

    Efek Konsentrasi Sublethal Fenol Terhadap Total Haemocyte Count (THC) Dan Histologi Insang Kepiting Bakau (Scylla Serata)

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    Hadirnya fenol yang melebihi batas ambang ke dalam ekosistem perairan dapat menjadi stresor kimia bagi organisme akuatik, termasuk juga bagi ekosistem muara oleh karena muara (estuaria) merupakan daerah pertemuan antara air tawar dari perairan sungai dan air laut sehingga berpotensi mengandung bahan kimia antropogenik. Kepiting bakau (Scylla spp.) memiliki siklus hidup yang sebagian besar berada pada ekosistem mangrove dan umum digunakan dalam studi ekotoksisitas. Total Haemocyte Count (THC) dan histologi organ insang dapat menginformasikan Perubahan histologi akibat stressor oleh karena paparan toksik, terutama fenol. Perlakuan sublethal fenol dengan konsentrasi yang berbeda terhadap kepiting bakau (Scylla serata) pada hari ke-1, hari ke-3, hari ke-5 dan hari ke-8 tidak terdapat perbedaan yang signifikan (p> 0,05) (Lampiran) terhadap rata-rata Total Haemocyte Count (THC). Namun pada hari ke-7 menunjukkan penurunan jumlah THC pada tiap perlakuan bila dibandingkan dengan kontrol (tanpa perlakuan). Perubahan histologi yang terjadi meningkat sebanding dengan konsentrasi fenol yang diperlakukan terhadap kepiting bakau (S. serata). Perubahan histologi yang terjadi adalah kerusakan struktur dari lamela insang (l) dan bagian terluar sinus lamela atau outer lamellar sinuses (ols) yang meliputi infiltrasi hemosit, hiperplasia maupun nekrosis

    Keanekaragaman Spesies Lamun di Kabupaten Bangka Selatan Provinsi Kepulauan Bangka Belitung

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    Marine area which is planted by seagrass called as seagrass beds. Seagrass is one of the typical ecosystems in marine waters. Bangka Belitung Province is one of the areas in Indonesia that has seagrass ecosystem. This study aims to determine the diversity, density, and coverage area of seagrass beds in the waters of South Bangka Regency. The research was conducted in Tukak, Tanjung Kerasak, and Tanjung Kemirai. The data is collected using quadratic transect method and also data of physics-chemical parameters such as temperature, salinity, pH, depth, velocity and water substrate. The results of the research showed that 7 species of seagrasses in South Bangka Regency are Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis, Enhalus acoroides, Thalassia hemprichii, Syringodium isoetifolium and Halophila minor. Seagrass in Lempeng waters which has the highest density is Cymodocea serrulata, about 58 ind/m2. The highest frequency of seagrass species in Tukak is Thalassia hemprichii about 1%. Seagrass species of Cymodocea serrulata has the highest cover percentage in Lempeng waters about 29.56%

    ANALISIS KUALITAS LINGKUNGAN SUNGAI WANGI-BEJI, PASURUAN YANG DIDUGA TERCEMARI OLEH LIMBAH PABRIK, PEMUKIMAN DAN PERTANIAN

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    The aim of study to determine the environmental quality, content and distribution of heavy metals in the waters of the Wangi River, Beji Sub-District, Pasuruan Regency in relation to the interests of environmental conservation around the river. Method of sampling doned by chosen, taking into account the condition of research area, current and depth of research area.The intended to see to what extent pollutant concentrations are spreading. Observation of water quality during research in different seasons of the rainy season (October 2016 to February 2017) and dry season (March to September 2017). Based on the results of environmental quality testing and heavy metals can be concluded that the environmental quality at the Wangi river flow is already at the threshold, so that the required waste prevention and environmental conservation activities. This should get great attention from the public in general and the local government in particular. The hope for the future is pollution of the Wangi River can be avoided and overcome.Penelitian ini bertujuan untuk mengetahui kualitas lingkungan, kadar dan sebaran logam berat di perairan aliran Sungai Wangi, Kecamatan Beji, Kabupaten Pasuruan dalam kaitannya untuk kepentingan pelestarian lingkungan sekitar aliran sungai tersebut. Metode pengambilan sampel dilakukan dengan secara terpilih, dengan memperhatikan kondisi serta keadaan dari daerah penelitian, arus dan kedalaman daerah penelitian. Hal ini dimaksudkan untuk melihat sampai  sejauh mana konsentrasi zat pencemar menyebar. Pengamatan kualitas air selama penelitian pada musim yang berbeda yaitu musim hujan (bulan Oktober 2016 sampai Februari 2017) dan musim kemarau (bulan Maret sampai September 2017). Berdasarkan hasil pengujian kualitas lingkungan dan logam berat dapat disimpulkan bahwa kualitas lingkungan pada aliran sungai Wangi sudah berada pada ambang batas, sehingga diperlukan kegiatan penanggulangan limbah dan pelestarian lingkungan.Hal ini harus mendapatkan perhatian yang besar dari masyarakat secara umum dan pemerintah daerah secara khusus.Harapan ke depannya adalah pencemaran sungai Wangi dapat dihindari dan ditanggulangi

    Lead accumulation and its histological impact on Cymodocea serrulata seagrass in the laboratory

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    The purpose of this study was to determine the concentration of lead (Pb) in Cymodocea serrulata tissues (roots, rhizomes, and leaves) using the AAS method, also to figure out Pb’s impact on seagrass’ histology and elements using the SEM-EDX Mapping method. The results showed that the higher the concentration and the length of the planting period, the higher the accumulation of heavy metals in the seagrass tissues. In this study, Pb was largely accumulated in the leaves, roots, and rhizomes tissue. Moreover, the seagrass histology in the epidermis and endodermis underwent shape and structure changes; it also went through damage or thickening at 15 ppm concentration, compared to control. This study strengthens the usefulness and relationship of Cymodocea serrulata seagrass as a biological indicator of metal contamination in the waters

    Analysis of Phytoplankton Structure Community, Water Quality and Cultivation Performance in Litopenaeus vannamei Intensive Pond Located in Tembokrejo Village, Muncar, Banyuwangi

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    Phytoplankton plays an important role in Litopenaeus vannamei cultivation. It plays a role as natural feed, water quality control, and indicator of shrimp cultivation success. The community structure of phytoplankton can be influenced by organic matter concentration in ponds. On the other hand, water quality and phytoplankton community structure also influence the productivity of shrimp cultivation. The research aimed to analyze the phytoplankton structure community, cultivation performance and the water quality in one of vananmei shrimp cultivation located in Muncar District. The research used the descriptive method. The research was conducted in two shrimp intensive system ponds in Tembokrejo Village, Muncar District, Banyuwangi, on February-March 2020. Parameters observed were composition, diversity, and density of phytoplankton, water quality parameters, and production performance in each pond. Based on the results, five phytoplankton classes was found: Bacillariophyceae (12 genera), Chlorophyceae (4 genera), Cyanophyceae (8 genera), Dinophyceae (2 genera), and Euglenophyceae (1 genus). Based on the density, Cyclotella and Chlorella were dominated in both ponds. Diversity index values on ponds 1 and ponds 2 were 1.64 and 1.71, respectively. The productivity of both ponds was 10.794 kg.ha-1 and 11.698 kg.ha-1, FCR (Feed Conversion Ratio) were 0.99 and 1.18, and ADG (Average Daily Growth) on both ponds were 0.16 g.day-1. Water quality parameters in both ponds showed an optimal range for vannamei cultivation, except phosphate, which is quite high. Overall, the cultivation performance of both ponds in our research showed good results. However, cultivation performance obtained in this research was not on its best performance yet due to Infectious Myonecrosis (IMNV) infection

    PENGARUH PENGGUNAAN TEPUNG SILASE DAUN MENGKUDU (Morinda citrifolia) DALAM FORMULA PAKAN TERHADAP PERTUMBUHAN IKAN SIDAT (Anguilla bicolor) STADIA ELVER

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    Penelitian ini dilakukan untuk mengetahui pengaruh dan dosis terbaik penggunaan tepung silase daun Mengkudu (M. citrifolia) dalam formula pakan terhadap pertumbuhan ikan Sidat (A. bicolor) stadia elver. Penelitian dibagi menjadi dua tahap, tahap pertama formulasi pakan percobaan, dan tahap kedua uji in vivo/uji formula pakan percobaan skala laboratorium pada ikan Sidat. Pelaksanaan penelitian tahap 1 adalah membuat formula pakan iso protein (40% ) dan iso energi (3.600 kkal/kg pakan) dengan memanfaatkan tepung silase daun Mengkudu sesuai perlakuan, menggunakan metode lembar kerja. Penelitian tahap 2 berdasarkan Rancangan Acak Lengkap (RAL) dengan tiga ulangan. Empat perlakuan substitusi protein tepung silase daun Mengkudu terhadap protein tepung ikan yang berbeda, meliputi perlakuan A 0%(0:100); B 10%(10:90); C 20%(20:80) dan D 30%(30:70). Parameter utama adalah kelulushidupan (survival rate), laju pertumbuhan spesifik (specific growth rate), rasio konversi pakan (feed convertion ratio) dan rasio efisiensi protein (protein efficiency ratio). Hasil penelitian menunjukkan bahwa penggunaan tepung silase daun Mengkudu dalam formula pakan berpengaruh nyata terhadap parameter laju pertumbuhan spesifik, rasio konversi pakan dan rasio efisiensi protein. Dosis terbaik tepung silase daun Mengkudu  mensubstitusi protein tepung ikan dalam formula pakan sebesar 14,71 – 15% yang menghasilkan nilai laju pertumbuhan spesifik 0,72 %BB/hari, rasio konversi pakan 3,38, dan rasio efisiensi protein 0,718.Kata kunci: formula pakan, silase daun Morinda citrifolia, Anguilla bicolo
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