DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan
Not a member yet
571 research outputs found
Sort by
Uji selektivitas fraksi Rf < 0,5 ekstrak MeOH biji putat air (Barringtonia racemosa) terhadap ikan mujair (Oreochromis mossambicus)
Get PDFAbstract. The objective of the present study was to evaluate the selectivity of the Rf 0.5 fraction of MeOH extract of putat air kernels (Barringtonia racemosa) on golden snail (Pomacea canaliculata) and tilapia (Oreochromis mossambicus). The research was conducted on November 2011 to February 2012 at Chemical Laboratory of Teacher Training and Education Facultyand Marine Chemical Laboratory of Coordinatorate of Marine and Fisheries of Syiah Kuala University. Thin-layer chromatography was used as the separation technique towards component compounds in the extract samples. The research was used five levels concentration of Rf 0.5 fraction of MeOH solution (20 ppm, 40 ppm, 60 ppm, 80 ppm, 100 ppm) with three repetitions. Mortality rates of golden snails and tilapia were detected when they were exposure to Rf 0.5 fraction of MeOH extract of B. racemosa kernels. The data were analyzed by Probit, and selectivity value (S) was calculated by Feng and Wang formula. The results revealed that Rf 0.5 fraction of MeOH extract of putat air kernels was selective to golden apple snails.Key words. Thin-layer chromatography, mortality, Probit, and moluscid
Komunitas fitoplankton di perairan Danau Laut Tawar Kabupaten Aceh Tengah, Provinsi Aceh
Get PDFAbstract. The aims of the present study was to evaluate community structure and biomass of phytoplankton based on the depth stratification in the waters of Lake Laut Tawar. Sampling was conducted during March and April 2010. The results showed that 43 species of phytoplankton belonging to five classes were found in Lake Laut tawar. The most common class was Chlorophyceae with 20 genera, followed by Bacillariophyceae (diatoms) by 9 genera, Cyanophyceae (10 genera), Dinophyceae (2 genera), and Euglenophyceae (2 genera). The highest species composition was found at II with 15 m depth (24 genera), while the highest abundance of phytoplankton was occured at station with 10 depth (155600 cells/l), while the lowest abundance was obtained at 15 depth (12745 cells/l). Overall the phytoplankton population in Lake Laut Tawar was dominated by Bacillarophyceae. In addition, the diversity index of phytoplankton was in moderate level (2.34), while the evenness index was ranged from 0.43 to 0.87, indicate the distribution of the individuals of each species was varied, however there was no predominant species detected.Keywords. Phytoplankton, structure community, Laut Tawar Lake
Pengaruh ENSO (El Nio and Southern Oscillation) terhadap transpor massa air laut di Selat Malaka
Get PDFAbstract. This research examines the influence of ENSO (El Nio and Southern Oscillation) in the Malacca Strait with the southern oscillation index using the Pacific Ocean in determining the condition of Normal, El Nio and La Nina as the analysis of mass transpor of sea water, sea surface elevation and the density of the sea. The research methods using the Navier-Stokes equations with force generating tides, winds from the National Centers for Environmental Prediction (NCEP) Year 1980- 007, salinity(Levitus and Boyer, 1994a) and temperature (Levitus and Boyer, 1994b). Equations of motion of the sea water were modeled with the model of Hamburg Shelf Ocean Model (HAMSOM). The results show that the transport in northwestern part of the Malacca Strait is lower, but in the southeastern part is stronger compared to that of in Normal and La Nina events. While in Sea Level Elevation at El Nio event is lower compared to that of in Normal and La Nina events. For sea surface density, the density values are 18.5 s/d 20.5 kg/m3 while for the later 30-50 m, the values are 19-21 kg/m3. Sea surface density and density for layer 30-50 m in th southeastern part of Malacca Strait for El Nio events are higher than that of in normal and La Nina event. Key words: Sea level elevation, sea density and Hamsom mode
Pengaruh salinitas dan daya apung terhadap daya tetas telur ikan bandeng, Chanos-chanos
Get PDFAbstract. The objective of this research was to study the influence of salinity and buoyancy on hatchability of milkfish eggs (Chanos-chanos). The completely random design was used this study. Two factors i.e. salinity and buoyancy were tested where the salinity with three levels oncentration; 16, 23 and 30 ppt, while the buoyancy with three egg buoyancy categories i.e. floating, drifting and sinking with three replicates respectively. The result showed that the hatchability of floating eggs in tested salinities were 76,7% ; 78,75% ; 91,7%, for 16, 23 and 30 ppt, respectively. Then drifting eggs were 65,3%; 67,0%; 77,0% and sinking eggs were 54,0% ; 55,3% ; 65,0% for 16, 23 and 30 ppt, respectively. In generally, the hatchability was increased with increasing of salinity. In addition, the hatchability of the floating eggs was higher than the sinking eggs. Keyword: Salinity, buoyancy, hatchability, milkfish
Komunitas fitoplankton di daerah estuaria Krueng Aceh, Kota Banda Aceh
Get PDFAbstract. The study on the phytoplankton community in estuary area of Aceh River was done from August to October 2006. The objective of the present study was to evaluate the structure of the phytoplankton community in Aceh River post tsunami. Explorative survey was done at three sampling sites along the river. Sampling sites were determinated based on salinity zoning; 30 ppt, 18-30 ppt and 5-18 ppt. The results show that higher diversity of the phytoplankton was found at sampling site 1, while the lower diversity was recorded at sampling site 3. There were no dominancy of species at all of sampling locatios. Diversity index was ranged between 0.95 to 0.98 and its mean that the diversity is higher at all of stations, while similarity between station 1 and 2 was higher compared to others stations.There was no difference in division composition of phytoplankton post tsunami, however, the total species was increased post tsunami.Keywords: Abundance, diversity index, similarity index, and tsunam
Model spasial daerah potensi banjir rob di pesisir Kabupaten Sukabumi Jawa Barat
Get PDFAbstract. On March 2012, the Coastal area of Kabupaten Sukabumi, West Java, was affected by tidal flooding. This tidal flooding occured because of the supermoon phenomenon that combine with heavy rains. The potential of tidal flood disaster in Kabupaten Sukabumi coastal area requires an immediate action in order to manage the disaster. The first step to mitigate the disaster is by mapping the area that potentially affected by tidal flood. The objective of this research is to modelling the tidal flood area in coastal of Kabupaten Sukabumi. The result of this research shows that the area that potentially affected by tidal flood without supermoon phenomenon is covering 29% of the coastal area of Kabupaten Sukabumi and it is increasing to 37% when supermoon phenomenon occured
Isolasi dan karakterisasi senyawa metabolit sekunder dari bakteri laut Streptomyces sp.
Get PDFAbstract: Streptomyces is one of bacterial genus which has been considered as a potential source of many novel antibiotics from both terrestrial and marine microorganism. In this paper, four secondary metabolites have been isolated and characterized from a marine Streptomyces sp. B5798, namely phydroxyphenylacetic acid (2), indole-3-carboxylic acid (3), indole-3-acetic acid (4), and Macrolactin A (5), respectively. Two of them are common compounds, namely indole-3-carboxylic acid (3) and indole-3-acetic acid (4). The 3,4 dihydroxybenzaldehyde is a degradation product of phydroxyphenylacetic (2) in microorganism. Macrolactin A (5) showed cytotoxicity against brine shrimps test (A. salina). All structures of the isolated compounds were elucidated based on spectroscopic and mass spectrometry data
Uji selektivitas ekstrak etil asetat (EtOAc) biji putat air (Barringtonia racemosa) terhadap keong mas (Pomacea canaliculata) dan ikan lele lokal (Clarias batrachus)
Get PDFAbstract. This study examined the selectivity of ethyl acetate extract of putat air (Barringtonia racemosa) in controlling Pomacea canaliculata compared to local catfish (Clarias batrachus). Five concentration of putat air (25, 50, 100, 200, and 400 ppm) with triplicate were tested in this study. The powder of putat air kernel was extracted through increasing the polarity of solvent, i.e. dichloromethane, ethyl acetate, and methanol. The mortality data were analyzed using Trimmed Spearman Karber (TSK) program version 1.5. The selectivity value was calculated based on LC50 values obtained from TSK. The results showed that (1) LC50 values of putat air's kernel extract of putat air to P. canaliculata and C. batrachus were 25.00 and 87.06 ppm, respectively, (2) the selectivity value of putat air's kernel extract as molluscicide of P. canaliculata was 3.48. Key words: Pomacea canaliculata, local catfish (Clarias batrachus), putat air (Barringtonia racemosa)
Kondisi arus pasang surut di perairan pesisir kota Makassar , Sulawesi Selatan
Get PDFAbstract. Numerical hydrodynamics model MOHID based on General Ocean Turbulence Model formula was used to study the tidal current in Makassar waters. The data used in this model are tidal elevation and bathymetry data from GEBCO. The tidal current simulation was conducted for 30 days. Model simulation results show that the tidal current velocity ranged between 0,001 m/s 0,012 m/s. The current velocity during neap tide is smaller than the velocity during spring tide. The pattern of tidal current in Makassar waters is dominantly flows towards westward and then turned heading northward direction. The simulation result of tide-induced residual current in verification point shows that the flows is ebb-dominant at a rate of 0,005 m/s heading westward direction
Karakter mulut dan variasi struktur gigi pada familia Bagridae yang tertangkap di Sungai Serayu Kabupaten Banyumas
Get PDFAbstract. The objective of the present study was to evaluate mouth character and tooth structure variations of Bagridae. The sampling was conducted on February to July 2012 at Serayu River Banyumas, the sampling was done four times with two week intervals using casting nets and gill nets. A total of three species Bagridae, namely Mystus gulio, Mystus nigriceps and Hemibagrus nemurus were recorded during the study. The results showed that there were no variation on mouth and dental structure among species. Thus, theese characters could not be used to discriminate species among these species.Keywords. Mouth character, tooth structure variations, Bagridae, River Seray