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Jurnal Ilmu dan Teknologi Kelautan Tropis
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DESIGN OF WAVE BUOY FOR COASTAL WAVE HIGH MONITORING

Munandar, Erik ( Program Studi Teknologi Kelautan, ITK-FPIK-IPB, Bogor ) , Jaya, Indra ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor ) , Atmadipoera, Agus S ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Ocean wave has complex and random characteristics that makes, which may cause the wave height and period are difficult to measure and to predict. In this paper we describe the development of wave buoy instrument was made using the acceleration sensor to monitor of buoys position in 3 axes (xyz). The measurement results shown metasentrum value is 2.5 which means that the buoy is stable. In addition, the difference in speed during the test successfully illustrated by means of the presence of two different frequencies with error is 0.01-0.07 m for a periode of 2.91 s and 4.95 s. Field measurement in the Palabuhan Ratu bay was succesfully obtaining some type of generated waves. The field trial that was done for 24 hours showed 4 significant period, clasisifield into 1 second and 3.37 second (wind wave), 1.20 hour (anomaly wave), and 12 hour (tidal wave). In conclusion, the wave buoy developed was successfully tested and performed well at sea trial, where the wave buoy capable of recording various wave spectrum.  Keywords: wave, technology, wave buoy, wind wave, tide

ANALYSIS OF THE CORAL REEF ECOSYSTEM EXPOSURE CAUSED BY TOURISM IN MENJANGAN ISLAND, WEST BALI NATIONAL PARK

Febrianti, Mutia Ismi ( Coastal Resources Management Graduated Program, Diponegoro University, Semarang, Central Java ) , Purwanti, Frida ( Faculty of Fisheries and Marine Science, Diponegoro University, Semarang, Central Java ) , Hartoko, Agus ( Faculty of Fisheries and Marine Science, Diponegoro University, Semarang, Central Java )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Menjangan island is part of the West Bali National Park, the physically including unique islands because has an area of 175 Ha, with no population and have equitable distribution of coral reefs around the island. Tourism is a major activity in this island. The exposure of coral reefs ecosystems exceslys without any limitation of activity will interfere with the coral reef ecosystems. This research is intended to find out some exposure elements and value of coral reefs ecosystems by tourism activities and natural elements that threat to damage the coral reefs. This reseach is focused on 4 points location snorkel using vulnerability theory approach with exposure parameters, the visitors number, density of Acanthaster planci, wave height, depth, pH, temperature, substrate type and tidal range. The result showed that exposure potential comes from various elements, i.e the natural elements and other elements such us the tourism activity. The exposure value of Menjangan island is 1.5 which is in low exposure level. Keywords : exposure, tourism activity, coral reefs, Menjangan island

3-D PHYSICAL MODELLING ON FLOATING - TYPE BREAKWATER

Ajiwibowo, Harman

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

BP Tangguh has port facilities in Bintuni Bay, West Papua, with a water depth of about 6 to 9 m. To secure the port activities and facilities, a floating-type breakwater was proposed. Three-dimensional physical modeling was conducted in a wave basin to determine its effectiveness against environmental conditions in Bintuni Bay by quantifying the transmission coefficient (KT). The basin was equipped with pistons to generate a monochromatic wave, four wave probes, and an eight-channel DAS (Data Acquisition System). Wave height (H) and period (T) data were recorded by the wave probes and validated by peilschaal observation. The incoming (Hi) and transmitted wave heights (Ht) before and after the breakwater, respectively, were measured and processed to obtain KT. The relationships between KT and non-dimensional variables were analyzed. The proposed floating-type breakwater was found to be effective for intermediate and short waves but not for long waves. Meanwhile, configuration 1 was choosen since the smaller structure still resulted in similar transmission waves compared to configuration 2. For the short waves, the floating-type breakwater resulted in transmission coefficients ranging from 0.5 to 0.7. The value of KT declined when the wave period became smaller. Keywords: 3-D physical modeling, floating-type breakwater, non-dimensional variables

RELATION OF FISH RESOURCE CONDITION WITH PROHIBITION OF USING SEINE-NETS IN TAKALAR DISTRICT SOUTH SULAWESI

Sajeri, Harlisa ( Departemen Teknologi Perikanan Laut, Institut Pertanian Bogor ) , Mustaruddin, . ( Departemen Pemanfaatan Sumberdaya Perikanan, FPIK, IPB, Bogor, Indonesia ) , Nurani, Tri Wiji ( Departemen Pemanfaatan Sumberdaya Perikanan, FPIK, IPB, Bogor, Indonesia )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

One of the regulations Indonesian government for fisheries management is PERMEN-KP. 02 2015 about prohibition of using trawls and seine nets in all areas of fisheries management Indonesia. Rule is enacted, because seine net probably damaging fish habitat on the sea. The purposes of this research were to describe seine net fishing unit, measuring dominant fish caught and measuring condition of fish resources. The study was conducted July - September 2017 in Takalar District, South Sulawesi. Data consisted of primary and secondary data. Data analysis in this research were descriptive, CPUE, relationship of CPUE between fishing effort, and calculated of  utilization rate. Results showed that seine net fishing gear nowdays are 58 ships measuring 5-6 GT. The size of catch has decreased from 9 years ago. CPUE of small pelagic fish decreased from 2008-2014, but increased  55% in 2015. MSY value of small pelagic fish and demersal were 16844.15 ton/year and 2126.6 ton/year, with optimum effort were 320 and  274 units. The utilization rate of small pelagic fish and demersal were  66% and 94% that indicated utilization fish resource was fully exploited. Enhancement of CPUE in 2015 for small pelagic fish, so the prohibition of using seine nets significantly can recover fish resources. Keyword: demersal fish, Fisheries seine nets, fish resources, small pelagic fish, Takalar District

THE EFFECT OF ORGANIC SEDIMENT CONTENT ON CORAL DIVERSITY IN KARIMUNJAWA ISLAND, INDONESIA

Nugroho, Fajar ( Department of Marine Science and Technology, Bogor Agriculture University, Bogor ) , Zamani, Neviaty P. ( Department of Marine Science and Technology, Bogor Agriculture University, Bogor ) , Madduppa, Hawis

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Coral reef now are under threats due to sedimentation. Fatal effect of organic rich sediment, leading corals mortality. Therefore, the study was conducted to investigate effect of organic sediment content to the coral diversity in Karimunjawa Island, Central Java, Indonesia. Field data was conducted at 6 locations.  Three sediment traps were deployed at each sites to measure organic sediment content. Twenty replicated quadrant transects were used to estimate coral density and coral diversity. Analysis of variance (ANOVA) was used to examine the differences of organic sediment content in each station. The linear regression was used to assess the relationship between organic sediment content and coral diversity. Our field result demonstrated that sediment content significantly different between sites with value range from 0.42 mg/800 ml - 1.32 mg/800 ml. Based on the Simson’s Diversity Index, the highest coral diversity found at Alang-alang as site with low sedimentation while the lowest coral diversity was found at Legon Lele as site with high sedimentation. The study shown significant negative correlation between organic sediment content and coral diversity with the coefficient of regression 0.68. This study convinces that disturbance on coral reefs might affect coral diversity in Karimunjawa Island, in addition to other factors such as the influence of human activities, natural disruption and climate change. Keywords: sedimentation, organic, coral, diversity, Karimunjawa

STUDY OF DENSITY AND CHANGE OF MANGROVE COVER USING SATELLITE IMAGERY IN SEBATIK ISLAND NORTH BORNEO

Hendrawan, Hendrawan ( Program Studi Teknologi Kelautan Pascasarjana, FPIK-IPB, Bogor ) , Gaol, Jonson Lumban ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor ) , Susilo, Setyo Budi ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Mangrove forest is a susceptive ecosystem which needs continuous monitoring to detect various threats such as human activities and natural disasters. Remote sensing and geographical information system (GIS) are very effective tools to be used in monitoring mangrove ecosystem due to they can reach large areas and periodically. Application of remote sensing technology to monitor mangrove ecosystem in Sebatik Island had never been conducted before. This research is important to be carried out to reveal changes in condition of mangrove forest in Sebatik Island. Aims of this research were analyzing the correlation between Normalized Different Vegetation Index (NDVI) values and its canopy cover percentages, calculated the accuracy of land cover classification with different spatial resolution, and measuring the changes of mangrove covers from 2005 to 2016. Land cover classification in this research used supervised classification with Maximum Likelihood algorithm. The NDVI was used as mangrove density indicator and vegetation condition. Field data measurement was taken to count canopy cover. The accuracy of Landsat images classification was about 83% and the SPOT 6 images around of 90%. Mangrove forest in Sebatik Island had increased from 2005 to 2016 as high as 31.27%. The correlation between NDVI and canopy percent cover were categorized as high with their coeficient correlation r=0.82 (Landsat 8) and 0.85 (SPOT 6). Keyword: density, Landsat, mangrove, NDVI, SPOT 6, Sebatik Island

INVESTIGATION OF DISEASES IN GROW-OUT OF SPINY LOBSTER Panulirus homarus CULTURED IN FLOATING NET CAGES (LOMBOK, PEGAMETAN AND PANGANDARAN)

sudewi, sudewi ( Balai Besar Riset Budidaya Laut dan Penyuluhan Perikanan (BBRBLPP) Gondol, Bali ) , Widiastuti, Zeny ( Balai Besar Riset Budidaya Laut dan Penyuluhan Perikanan (BBRBLPP) Gondol, Bali ) , Slamet, Bejo ( Balai Besar Riset Budidaya Laut dan Penyuluhan Perikanan (BBRBLPP) Gondol, Bali ) , Mahardika, Ketut ( Balai Besar Riset Budidaya Laut dan Penyuluhan Perikanan (BBRBLPP) Gondol, Bali )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Spiny lobster, Panulirus homarus is an economically important fishery product which indicated by huge demand of this species at both local and international markets. However, high mortalities were recorded during grow-out period due to infection of diseases. This study was conducted to investigate disease occurrences in grow-out of P. homarus cultured in floating net cages. The study was done throughout collection of samples, observation of parasites, isolation of fungi and bacteria, and detection of Milky Hemolymph Disease of Spiny Lobster (MHD-SL) by PCR. The samples were obtained from Lombok, Pangandaran, and Pegametan (Bali), five lobsters each. Results showed that three lobsters from Pangandaran were infected with ectoparasite Octolasmis sp. that infect mostly in the gill lamellae. One sample from Lombok was found to be infected with Fusarium sp., the causative agent of black gill disease which indicated by black coloration of the gill. Detection of milky disease showed that one lobster from Pegametan and two lobsters from Lombok were infected with the disease. Milky disease is the most devastating disease which causing in high mortalities within 5 days of the onset of symptoms of milky disease infection. Considering that MHD-SL can be transmitted rapidly, it is suggested to perform biosecurity and quarantine procedures immediately to prevent disease translocation.  Keywords: lobster diseases, Panulirus homarus, Milky Hemolymph Disease of Spiny Lobster (MHD-SL), black gill disease, Octolasmis sp. 

CLASSIFICATION OF BENTHIC HABITAT BASED ON OBJECT WITH SUPPORT VECTOR MACHINES AND DECISION TREE ALGORITHM USING SPOT-7 MULTISPECTRAL IMAGERY IN HARAPAN AND KELAPA ISLAND

Prabowo, Nico Wantona ( Program Studi Teknologi Kelautan, Institut Pertanian Bogor, Bogor ) , Siregar, Vincentius P. ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor ) , Agus, Syamsul Bahri ( Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

The research of object based image classification (OBIA) with machine learning algorithm for high resolution image in Indonesia is still limited especially for coral reef mapping, therefore further research needed for comparison in method and application of algorithms as alternative of classification. This research aims to map benthic habitat based on multiscale classification using OBIA method with support vector machine and decision tree algorithm in Harapan Island and Kelapa Island, Kepulauan Seribu. Segmentation was performed using a multiresolution segmentation algorithm with a scale factor of 15. The OBIA method is applied to atmospheric corrected images with a predefined benthic habitat classification scheme. The overall accuracy of SVM and DT algorithm implementations are 76.68% and 60.62%, respectively. The Z statistic value analysis obtained from the application of two algorithms used is 2.23, where this value indicates that the classification with SVM algorithm is significantly different from the DT algorithm. This research suggest that the OBIA technique could be a promise approach for mapping benthic habitats. Keywords: OBIA, Harapan and Kelapa Island, segmentation, DT algorithm, SVM algorithm

CORAL REEF ECOSYSTEMS ASSESSMENT AND SUSTAINABILITY IN MARINE CONSERVATION AREA PULO PASI GUSUNG, SELAYAR

Cahyani, Waode Siti ( Program Studi Pengelolaan Sumberdaya Pesisir dan Lautan, FPIK-IPB, Bogor ) , Setyobudiandi, Isdradjad ( Departemen Manajemen Sumberdaya Perairan, FPIK-IPB, Bogor ) , Affandy, Ridwan ( Departemen Manajemen Sumberdaya Perairan, FPIK-IPB, Bogor )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Coral reefs are one of the important ecosystems in coastal areas. Coral reefs have important values for coastal communities and their presence is particularly vulnerable to disturbance from both natural and anthropogenic activities. Establishment of a marine conservation area is essential to protect coral reefs from over-exploitation. This study aims to assess the condition of coral cover and sustainability status of coral reef ecosystem in Pulo Pasi Gusung Marine Conservation Area (KKPD) of Selayar district. The results of this study are expected to provide recommendation for government in policy making related to better management to improve supervision of coral reef ecosystems in Pulo Pasi Gusung KKPD. Data collection was conducted using line intercept transect (LIT) at 3 and 10 meter depth. Coral reef sustainability status was analyzed using Multi Dimensional Scaling (MDS) with Rap Insus COREMAG (Rapid Appraisal-Index Sustainability of Coral Reef Management) by comparing the management before the establishment of KKPD (Year 2010) and after the establishment of KKPD (Year 2015). Assessment is conducted on 5 dimensions namely ecological, economic, social cultural, technological and infrastructure dimensions as well as legal and institutional dimensions. The results of the analysis of the five dimensions in the assessment of coral reef sustainability status in Pulau Pasi after the establishment of KKPD on average experienced an increase in sustainable index than before the establishment of KKPD. Keywords: coral reefs, conservation area, sustainability status, management

DETERMINATION OF EFFECT OF SOIL AND WATER QUALITY TO TOTAL PRODUCTION OF POLYCULTURE WHITE SHRIMP AND MILK FISH PONDS IN LAMONGAN REGENCY, EAST JAVA PROVINCE THROUGH PATH ANALYSIS APPLICATION

Hendrajat, Erfan Andi ( Balai Riset Perikanan Budidaya Air Payau dan Penyuluhan Perikanan, Sulawesi Selatan ) , Ratnawati, Erna ( Balai Riset Perikanan Budidaya Air Payau dan Penyuluhan Perikanan, Sulawesi Selatan ) , Mustafa, Akhmad ( Balai Riset Perikanan Budidaya Air Payau dan Penyuluhan Perikanan, Sulawesi Selatan )

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 10, No 1 (2018): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Bogor Agricultural University

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Abstract

Soil and water quality are the factors that determine the brackishwater ponds total production in Lamongan Regency, East Java Province.  This research aimed to determine direct effect and indirect effect of soil and water quality on  total production of brackishwater ponds policulture of white shrimp and milkfish productivity in Lamongan Regency. The research was conducted in brackishwater ponds of Glagah, Karangbinangun, Turi, Sukodadi, Karanggeneng, and Maduran Subdistricts, Lamongan Regency. Soil quality was defined as independent and exogenous variables; water quality as an intermediate, dependent and endogenous variables; and total production as dependent and endogenous variables. Characteristics of soil and water quality as well as the total production is known through descriptive statistics application, while the effect of soil and water quality on total production is known through path analysis applications. The results of path analysis showed that   15 soil quality variables analyzed was only 2 variables that affect on total production, namely: pHKCL  and Al, and 11 water quality variables analysed only 2 variables that affect on total production namely: DO and pH. pHKCL of soil has significant effect with direct effect of 0.314 on total production, while Al has hightly significant effect with direct effect of -0.426 on total production.  DO and pH of water have direct effect of -0.367 and  -0.245 on total production, respectively.  Keywords: path analysis, soil, water, brackishwater pond, policulture, Lamongan Regency