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OPTIMAL HARVEST TIME MODEL IN AQUACULTURE TO MAXIMIZE PROFIT D. Wijayanto; F. X. Sugiyanto; D. Poerwono
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTThe purpose of this study was to develop the optimal harvest time to generate maximum profits in Aquaculture. This study used a model of von Bertalanffy length growth combined with the length-weight relationship and the mortality rate to estimate of fish biomass. Profit was calculated as total of revenue minus total of cost. Both the harvested biomass of fish and price of fish were determined as factors affected the revenue of aquaculture. The components of costs were cost of seed procurement, cost of feed procurement, cost of harvesting transportation and the daily cost. The daily cost of aquaculture in floating cages are cost of labour, cost of medicines, cost of energy, cost of assets depreciation, cost of supporting equipment and cost of maintenance assets that converted to IDR/day. Profit maximization was performed by derivative the equation of profit to aquaculture periods (first order condition), and its second derivatives was negative (second order condition). The research model was applied to the red Tilapia culture in floating cages at the Reservoir of Wadaslintang, Indonesia. The research results demonstrate that the model in this study can be used to estimate aquaculture periods (286 days) which can generates maximum profits.

ESTIMATION CARBON STOCK ON MANGROVE VEGETATION AT MANGROVE AREA OF UJUNG PIRING JEPARA DISTRICT Dimas Panji Budi Prasetyo; Ria Azizah Tri Nuraini; Endang Supriyantini
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTMangrove forrest is an coastal ecosystem which has so many advantages and usages. Mangrove forrest has ecological functions as carbon sink. This function becomes very important because of the increased greenhouse gas (GHG) emissions in the atmosphere causing climate change. Climate change raises the temperature on the surface of the earth, thus threatening the existence of humans and other living things. The purpose of this research was to determine the amount of biomass, carbon reserve, CO2 absorption and soil organic carbon in mangrove vegetation Ujung Piring, Jepara.The method used in this research was descriptive and location determined by purposive sampling, which is divided into three locations, in each location used 2-3 x sampling. The data were collected using a 10 x 10 m plot. Determination of stored biomass in stands using non-destructive sampling by measuring stem diameter (Dbh) and allometric equation on each mangrove species. Carbon stock was determined using the results of biomass determination, whereas CO2 absorption was determined using carbon stock. Soil organic carbon is determined using the results of organic matter measurement.The result showed that 6 mangroves species were found in the research plots: Rhizophora apiculata, Rhizophora mucronata, Ceriops tagal, Lumnitzera racemosa, Sonneratia alba, and Sonneratia caseolaris. The largest carbon stock value is in Location I with the dominance of R.apiculata. The carbon stock of mangrove vegetation has a linear relationship with soil organic carbon. Ujung Piring has amount of biomass 16,69 ton/ha, carbon stock 7,85 ton/ha, CO2 absorption 28,76 ton/ha and soil organic carbon 1706 ton/ha. Key words: Biomass, Carbon Stock, CO2 Absorption, Mangrove forrest, Soil Organic Carbon

BATHYMETRY MAPPING STUDY AS A CONSIDERATION IN DETERMINING SHIPPING CHANNEL IN PRAMUKA ISLAND WATERS, SERIBU ISLANDS, DKI JAKARTA Agus Anugroho D.S; Petrus Subardjo; Bintang Yosua Cristian M.
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTBathymetry is a method or technique in determining sea-depth or seabed profile from the result of sea-depth analysis. Bathymetry data is an important data used as shipping channel consideration, especially in Pramuka Island Waters, Seribu Islands, DKI Jakarta. Determining shipping channel in Pramuka Island Waters is really important as the reference for secure sea traffic. The purpose of this study is to know bathymetry condition used as consideration in determining shipping channel in Pramuka Island Waters, Seribu Islands, DKI Jakarta. This reasearch was conducted in August, 4th – 6th 2016 on waters and dock of Pramuka Island, Seribu Islands, DKI Jakarta. The materials used as objects of this study are tidals, bathymetry and seabed morphology in Pramuka Island, Seribu Islands, DKI Jakarta. This research used case study method, i.e., research methods conducted intensively and detailed on a case, can be environment, certain situation to reveal or to understand something and the result can not be used in other areas. Case study in this research is knowing sea-depth. In this case, the result of this research which are bathymetry and shipping channel, cannot applied in other areas. Data processing using software Surfer 9.0, Arc Gis 10.3 and Microsoft Excel. The result of this research indicate that sea-depth in research location have depth between -0,7 until -38,6 m. Seabed morphology in Pramuka Island Waters was included in sloping category, with the slope value of 2,57% untill 10,12%. Tidal type is diurnal type with Formzahl value 3,34. Consideration of shipping channel due to vessel traffic is channel from North Jakarta direction and from other islands direction heading Pramuka Island. Key words: bathymetry, shipping channel, pramuka island waters

STUDY OF MIXED LAYER DEPTH VARIATION IN LIRAN ISLAND WATERS, SOUTHWEST MALUKU, APRIL 2016 Andriana Kartina Wingtyas; Agus Anugroho Dwi; Anindya Wirasatriya; Muslim Muslim; Teguh Agustiadi
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTLiran Island waters are located between two seas, the Banda Sea and the Timor Sea. These waters are also the border between Republic of Indonesia and the Democratic Republic of Timor Leste (RDTL). The thickness of mixed layer depth in Liran Island waters are vary. This is assumed as a result of the influence of transition season I wind that blew in the area in April 2016. This study aims to determine the variation of the thickness layer mixed layer Liran Island waters, Southwest Maluku District on April 2016 caused by the transition season I wind. The methodology that used in this research is descriptive method with quantitative approach. The main data that used in this study is in situ sea temperature data, while the supporting data that used in this study is wind data which measured directly in the field for 9 days. The result of this research is based on determination of layer mixed layer using criterion ΔT = 1.0 0C. The west part of Liran Island had thinnest layer mixed layer depth that is about 20 - 38 m. The east part of Liran Island waters had the thickest mixed layer depth which up to 55 m. Meanwhile, the north part of Liran Island waters had a thickness of mixed layer between the eastern and western waters of 40 m. This related to the wind that blowing from the southwest to the northeast and causing a downwelling phenomenon in the east part of Liran Island waters and upwelling phenomenon in the west part of Liran Island waters while the north part of Liran Island waters did not get a great influence from the movement of the wind because of its location which protected by Liran Island itself. Key words: mixed layer depth, the transitional monsoon I, Liran Island waters

THE CONCENTRATION OF DISSOLVED PHOSPHATE IN WATER MASS AND SEDIMENT STUDY CASE IN SERANG AND MLONGGO RIVER Lilik Maslukah; Sri Yulina Wulandari; Hasana Kushadi Ratnasari
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTSerang and Mlonggo Estuaries are located in the Jepara Regency, Central Java. Serang Estuary is located between Kedungmutih and Kedungmalang Village, while Mlonggo Estuary is located between Slagi and Jambu Village. Citizens around Serang and Mlonggo Estuaries dumped the waterwaste, which taken by rivers into the sea, such as household activity, agriculture, fish farming as well as the rest of the processing. The wastewater contains organic material and nutrients such as phosphate and organic carbon. The purpose of this research are find out the value and distribution of total organic carbon and bioavailable phosphate in sediments also orthophosphate in water. This research was conducted on June 18 – 19th 2016. Primary data in this research were total organic carbon (TOC) andbioavailable phosphate (BAP) from sediments also orthophosphate from water samples. Secondary data of this research were currents velocities, water qualities, bathymetry map. This research used quantitative method. While purposive method was used to determine the location of sampling. The results of the research showed the average value of TOC in sediments in Serang and Mlonggo Estuaries were 19.018% and 10.086%; BAP were 1.35 µmol/g and 0.33 µmol/g; orthophosphate in water were 0.012 ppm and 0.021 ppm. In both areas, the values of TOC and BAP in sediments also orthophosphate in waters the more the marine areas tended to decrease. Key words: Total Organic Carbon, Bioavailable phosphate, Orthophosphate, Serang Estuary, Mlonggo Estuary

CHARACTERISTIC AND THE DISTRIBUTTION OF SPASIO – TEMPORAL MACRONUTRIENT IN THE LAGOON AREA OF SEGARA ANAKAN Rose Dewi; Muhammad Zainuri; Sutrisno Anggoro; Tjahjo Winanto; Hadi Endrawati
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTLagoon Area of Segara Anakan (SAL) have influence of natural and anthropogenic factors impacting on the increasing of macronutrient, ecologically SAL is downstream from several rivers watershed Citanduy. SAL is tropically moist and influenced monsoon wind, causing the fluctuated waters. The purpose of this research is to recognise the characteristic spatio-temporal makronutrien lagoon. The measurements of macronutrient, include: TN (Total of Nitrogen), NH3 (Ammonia), NO3- (Nitrate), TP (Total of Phosphate), and PO43- (Orthophospat), using methods of spectrophotometric and micro-kjeldahl. The spatial approach is done on 7 stations (S) with representations: (S) natural factors and (S) the presence of anthropogenic activities. The temporal approach (time series) for a year refers to the monsoon wind pattern (west, transition I, east and transition II) season. The results of laboratory tests are discussed descriptively and adapted to the Indonesian standart of waters quality. To facilitate spatio-temporal interpretation, the data is presented formingly a thematic map. Temporal results show in the west season, the highest macronutrient content is dominated by TN (0.587 ± 0.223) mg / L, NH3 (0.875 ± 1.290) mg / L and PO43- (0.390 ± 0.909) mg / L, while NO3- (0.185 ± 0.015 ) mg / L and TP (0.155 ± 0.026) mg / L highest during transitional season II. In the spatial approach, (S) with anthropogenic characteristics contribute to the whole height of the macronutrients. The effects of rainfall, anthropogenic pressure, aquatic hydrodynamics and the contribution of metabolic waste discharged from organisms, are thought to cause in the increasing of SAL macronutrients. Management and lagoon management strategies are required by the local government, stakeholders and communities to prevent the phenomenon of eutrophication of the lagoon. Key words: Macronutrient, Nitrogen, Phospate, lagoon of Segara Anakan

THE INFLUENCE OF OCEAN CURRENTS TOWARDS DISTRIBUTION OF TOTAL SUSPENDED SOLIDS VERTICALLY IN CILALANANG ESTUARY, DISTRICT INDRAMAYU Gentur Handoyo; Petrus Subardjo; Agus Anugroho Dwi; Muhammad Sulaiman
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTCilalanangriver located in the village of EretanWetan, District Indramayu. There are Fishery Harbor Beach (PPP) and shipping activities in this region is quite high. Activities in the PPP could potentially lead to silting due to the material carried by the river flow. The purpose of this study to determine the concentration of total suspended sediment (TSS) and the influence of ocean currents on the TSS in Cilalanang Estuary, District Indramayu. The research is located at coordinates 1080 4’ 53.400” EL -1080 5’ 50.215” EL and 60 19’ 26.709” SL - 6019’ 26.720” SL. The method used in this research is quantitative method. Analysis of the TSS is done by making the TSS distribution maps using ArcGIS10.5 and modeling ocean currents using MIKE 21. The results showed that the concentration of TSS at low tide toward the high tide is worth between 286-888 mg / l whereas when the high tide towards low tide worth between 348-553 mg / l. Dominant ocean current direction at the time of low tide to the hightide leads to the southwest. This causes TSS concentration coming out of the mouth of the river converge toward the southwest near the shore. In conditions of high tide toward low tide the dominant current direction leads to the northeast. This led to the spread of TSS concentration coming out mouth of the river away from the shore. Key words: Cilalanang River, IndramayuDistrict,Ocean Currents, Ocean Tides, Total Suspended Solids

THE INFLUENCE OF Acanthus ilicifolius EXTRACTS TO HISTOPATHOLOGICAL ON HEPATOPANCREAS OF TIGER SHRIMP (Penaeus monodon F.) G. Saptiani; S. B. Prayitno; S. Anggoro; C. A. Pebrianto
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTAssesing the influence of the leaf extract to histopathological on hepatopancreas of shrimp as protection from Vibrio harveyi. Crude, ethyil acetate, and n-butanol fraction was given by dipping method. The best survival was the fraction of n-butanol 300 ppm, followed by n-butanol 200 ppm and 700 ppm etyl acetate fraction. It reduced the prevalence of attacks and improved the survival of shrimp. The best pathophysiological and pathological anatomy of shrimp was n-buthanol fraction, followed etyl acetat fraction and then crude. Histopathological of hepatopancreas was normal on n-butanol fraction, normal and minor in damage on etyl acetat fraction and crude, and minor to moderate damage on antibiotic Key words: Acanthus ilicifolius, Vibrio harveyi, histopathological, hepatopancreas

SIMULATION OF TSUNAMI WAVE PROPAGATION AND RUN-UP AT PANGANDARAN BAY, WEST JAVA Petrus Subardjo; Siddhi Saputro; Sofia Alma Aeda
International Journal of Marine and Aquatic Resource Conservation and Co-existence Vol 2, No 1 (2017): IJMARCC
Publisher : International Journal of Marine and Aquatic Resource Conservation and Co-existence

ABSTRACTPangandaran is an area located in Southern of Java Island, which dealing with the Indian Ocean. In the Indian Ocean, there is a subduction zone between the plates that can cause earthquakes and tsunami, as an example earthquakes and tsunami in Pangandaran (2006). The earthquake and tsunami that have occurred in an area, potentially happen again in the future. The purpose of the research is to determine the height of tsunami, tsunami time travel and tsunami wave run-up. This research was conducted on December 29th to 30th, 2015 in Pangandaran Bay with coordinates between 108°20’00” E - 108°47’00” E and 7°36’00” S - 7°48’00” S. The method used is quantitative method and the method that has been used to determine research location is purposive sampling. The data used are the source of earthquake faults, bathymetry data, and slope the beach. Data modeled using COMCOT v1.7 software to determine the height of tsunami and tsunami time travel. The height of tsunami wave by simulation model used to determine tsunami wave run-up. The simulation result known tsunami wave height range from 2 to 9 meters with run-up between 0 to 510 meters. The highest tsunami wave at observation point 3 and the lowest at observation point 1. The highest run-up tsunami at observation point 3 and the lowest at observation point 6. Time required for tsunami waves reach land between 39 to 48 minutes. Based on the result can be concluded that the highest tsunami wave located in sloping morphology, while the lowest tsunami located in high area or behind the cape area. Key words: The tsunami, Pangandaran, Comcot, Run – up

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Location Kota semarang, Jawa tengah INDONESIA

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Contact Name
-

Contact Email
-

Phone
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Journal Mail Official
-

Editorial Address
-

Location
Kota semarang,

Jawa tengah

INDONESIA