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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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ISSN : 08537291 EISSN : 24067598 DOI : -

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ILMU KELAUTAN: Indonesian Journal of Marine Sciences (IJMS) is dedicated to published highest quality of research papers and review on all aspects of marine biology, marine conservation, marine culture, marine geology and oceanography.

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Uji Toksisitas Ekstrak Gorgonian Isis hippuris Terhadap Nauplius Artemia salina Agus Trianto; Yan Yan HAS; Ambariyanto Ambariyanto; Retno Murwani
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 2 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Beberapa jenis organisme laut merupakan sumber alam yang potensial untuk bahan obat. Salah satu sumber daya laut yang cukup potensial untuk dapat dimanfaatkan adalah gorgonian Isis hippuris. Hewan ini hidup di ekosistem terumbu karang tersebar di perairan dangkal dan jernih terutama di pertengahan dasar karang. Tujuan penelitian ini adalah untuk mengetahui aktivitas toksisitas ekstrak gorgonian Isis hippuris terhadap nauplius Artemia salina, mengetahui LC50 -24 jam fraksi toksik dan mengidentifikasi senyawa yang berperan dalam toksisitas. Penelitian dilaksanakan di laboratorium Ekplorasi dan Bioteknologi Ilmu Kelautan UNDIP, Teluk Awur Jepara. Hasil penelitian menunjukan perlakuan ekstrak gorgonian I. hippuris fraksi etil asetat terhadap nauplius A. salina dari 12 fraksi KKT diperoleh 5 fraksi KKT yang toksik. Berdasarkan analisa probit diketahui fraksi KKT 9 memiliki aktivitas toksik terbaik dengan nilai LC 50-24 jam sebesar 16,98 ppm. Hasil identifikasi dengan GC/MS diperoleh golongan senyawa-senyawa Hidrokarbon dan Asam lemak yaituNaphthalene, Xylane, Phenylacetonitrile, 1,2 Benzenedicarboxylic dan senyawa turunan phenol.Kata kunci: Isis hippuris, Artemia salina, toksisitas, BSLT.Several marine organisms are known to have bioactive substances which are very potential for drugs materials. One of this organism is gorgonian, Isis hippuris which live in coral reef ecosystems. The objective of this study is to investigate I. hippuris extract toxicity to nauplius of brine shrimp Artemia salina. This was done by calculating LC50-24 h and followed by identifying its compound. This study was done at Exploration and Biotechnology Laboratory, Marine Science department. UNDIP, Awur Bay, Jepara. The results showed that from 12 ethyl acetate fraction open column chromatography, 5 of them were toxic. Based on Probit analysisit was found that fraction 9 was the best fraction which gave LC50-24 h 16,98 ppm. Based on GC/MS results there are several compound found i.e. hydrocarbon, lipid acid (napthalene, xylane, phenylacetonitrile, 1,2benzenedicarxulic) and phenol derived compound.Key words : Isis hippuris , Artemia salina, toxicity, BSLT

Kelimpahan Lorjuk (Solen vaginalis) di Pantai Timur Surabaya Ninis Trisyani; Bambang Irawan
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 13, No 2 (2008): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Lorjuk (Solen vaginalis) adalah salah satujenis kekerangan (Pelecypoda) yang mempunyai nilai ekonomis tinggi. Biota tersebut dapat ditemukan berlimpah di Pantai timur Surabaya. Tujuan penelitian ini untuk mengetahui kelimpahan lorjuk dan kondisi ekologinya. Sampel diambil dari lima stasiun yang mewakjli habitat yang dihuni dan tidak dihuni lorjuk daribulan April-Desember 2007. Hasil penelitian menunjukkan bahwa lorjuk tidak ditemukan pada lokasi dengan substratyang kandungan lumpumya tinggi, dan lebih menyukai substrat dengan kandungan substratpasiryang tinggi. Kelimpahan lorjuk tertinggi ditemukan pada bulan Juni hingga September. Panjang cangkang lorjuk berkisar 1.8-6.9 cm dengan berat 0.16-9.6gr.Analisa hubungan panjang dan bobot lorjuk menunjukan nilai korelasi rata-rata 0.905, yang berarti pertumbuhan panjang seiring dengan pertambahan berat. Sebaran cangkangdidominasi ukuran 3-5cm denganprosentase 65%Kata kunci: Lorjuk, Solen vaginalis, kelimpahan, Surabaya

Sex Ratio And Size At First Maturity Of Blue Swimming Crab (Portunus pelagicus) Salemo Island Pangkep Regency Muh. Saleh Nurdin; Syamsu Alam Ali; Dewi Yanuarita Satari
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 1 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Blue swimming crab (Portunuspelagicus) is aeconomical valuable fisheries importantcommodity due to the high demand and availability jobs created for the fishermen. Due to their high demand blue swimming crab heavily exploited from Salemo Island. This study aimed at comparing the sex ratio and the size at first maturity of blue swimming crab caught in mangrove ecosystems, coral reefs, and seagrass. Sex ratio was analyzed using chi square test and the size at first maturity was analyzed using the Spearman-Karber formula. The results showed the sex ratio ofmales and femalessmall crab caught in every ecosystem is balanced. The size at first maturity of blue swimming crab caught in mangrove, seagrass and coral reefs, each to the male 81,08 mm, 102,36 mm and 102,87 mm in width and size of female 94,54 mm, 83,35 mm, 98,31 mm width. In a reference to government regulations, the blue male swimming crab caught in the coral reef and seagrass ecosystems have yet to size at first maturity is allowed to be captured. Keywords: blue swimming crab, sex ratio,size at first maturity, Salemo Island

Oksigen Terlarut dan Apparent Oxygen Utilizationdi Perairan Teluk Klabat, Pulau Bangka Marojahan Simanjuntak
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 2 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Pengamatan kadar oksigen terlarut dan Apparent Oxygen Utilization (AOU) di perairan Teluk Klabat, Pulau Bangka telah dilakukan pada bulan Juni-Juli 2003. Tujuan penelitian ini adalah untuk mengetahui kondisi lingkungan dan distribusi oksigen terlarut serta Apparent Oxygen Utilization (AOU) perairan Teluk Klabat, Pulau Bangka. Contoh air laut diambil dari 20 stasiun penelitian dengan menggunakan Botol Nansen di perahu nelayan dan Botol Niskin di Kapal Riset Baruna Jaya VII pada 3 kedalaman yaitu pada lapisan penvukaan (0 m); 5 meter dan dekat dasar. Kadar oksigen terlarut ditentukan dengan titrasi jodometri berdasarkan metode Winkler. Has/7 analisa oksigen terlarut menunjukkan kadar oksigen terlarut di lapisan permukaan (0 m); 5 m dan dekat dasar masing-masing berkisar antara 3,54 - 4,08 ml/1; 3,22 - 3,58 ml/I; 2,97 - 3,30 ml/ I. Kadar ini terus menu run dengan bertambahnya kedalaman. Berdasarkan nilalsuhu dan salinitas yang diperoleh telah dihitung daya larut "apparent oxygen utilization" (AOU) dan derajat kejenuhan oksigen pada lapisan permukaan. Di lapisan permukaan sampai dekat dasar diperoleh kisaran nilai AOU yaitu - 1,07 sampai 0,09 ml/1 dengan nilai AOU yang negatip diperoleh sebanyak 4 % sedangkan positip 96 % di lapisan permukaan. Dari hasil penelitian diperoleh konsentrasi oksigen terlarut yang belum menunjukkan dampak negatif terhadap lingkungan perairan. Kata kunci: Apparent Oxygen Utilization (AOU), oksigen terlarut, Teluk Klabat Observation of dissolved oxygen concentration in Klabat Bay Waters Bangka Island was carried out on June-July 2003. The aim of research was to know environment condition and dissolved oxygen distribution and Apparent Oxygen Utilization (AOU) values in the Klabat Bay Waters. Water samples from 3 depths (0, 5, bottom depth) were collected from 20 stations by using Nansen bottles on the boat and Niskin Bottles on the Research Vessel Baruna Jaya VII. The dissolved oxygen was analyzed with Iodometric titration by Winkler method. The results showed that the concentrations of dissolved oxygen ranged 3.54 – 4.08 ml/l ; 3.22–3.58 ml/l; 2.97 – 3.30 ml/l were found in surface layer (0 m), 5 m and near bottom depth respectively. These concentrations decreased by depth. The highest concentration was found on the offshore area, while the lowest concentration was found at near coastal. In the surface layer till near bottom depth were found AOUvalues varied between -1.07 to 0.09 ml/l with the AOU negative values was found 4 % and positive 96 % inthe surface layer. The result indicated that dissolved oxygen concentration did not show negative impact inthe Klabat Bay Waters, Bangka Island.Key words: Apparent Oxygen Utilization (AOU), dissolved oxygen, Klabat Bay

Utilization of Wavewatch III Model Output Data for High Wave Analysis Ricky Daniel Aror; Wilhelmina Patty; Andri Ramdhani
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 3 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

This study discusses the occurrence of extreme waves in North Sulawesi waters from 17 to 24 June 2016 using Wavewatch III (WW3) model output data with resolution 0.125o x 0.125o extracted from MIDAS-BMKG. The extracted WW3 data is mapped using ArcMap and presented in graphical form. Based on the results of the study, the significant wave height is in the range of 0.0 to 1.0 m and the average wind speed ranges from 0 to 15 knots in the early phase of 17-19 June 2016. Significant wave increases in the peak phase of 20-22 June 2016 that reaches 1.5 - 2.0 m and average wind speeds reach 25 knots. The average wind speed and the significant wave height decreased after June 23, 2016. The high of the significant wave are influenced by the low-pressure circulation in the atmosphere near the Sangihe-Talaud Islands. Further study can be done as a comparison of this study e.g. using wave data from altimeter satellites or comparing with other parameters such as the influence of swell and wind sea.

Laju Pertumbuhan Spesifik dan Kandungan Asam Lemak pada Mikroalga Spirulina platensis, Isochrysis sp. dan Porphyridium cruentum (Specific Growth Rate and Fatty Acid Content of Microalgae Spirulina platensis, Isochrysis sp. and Porphyridium cruentum) Mujizat Kawaroe; Tri Pratono; Ayi Rachmat; Dahlia Wulan Sari; Dina Augustine
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 3 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Mikroalga merupakan pabrik sel yang mampu mengkonversi karbondioksida menjadi biofuel potensial, makanan serta bioaktif yang bernilai tinggi dengan bantuan sinar matahari. Tujuan penelitian ini adalah untuk menganalisis laju pertumbuhan spesifik dan kandungan asam lemak 3 jenis mikroalga yaitu S. platensis, Isochrysis sp., P. cruentum. Kultivasi mikroalga murni dilakukan di laboratorium selama 8 hari dengan media Guillard/F2. Proses ekstraksi dilakukan dengan menggunakan metode sokletasi serta pelarut n-heksan. Profil dan kandungan asam lemak mikroalga dilakukan dengan menggunakan kromatografi gas spektrofotometri massa (GC-MS). Hasil penelitian menunjukkan bahwa kepadatan mikroalga tertinggi terdapat pada hari ke-8. Laju pertumbuhan spesifik tertinggi terdapat pada P. cruentum, yaitu 0,37/hari. Spesies mikroalga yang memiliki total konsentrasi asam lemak paling tinggi adalah Isochrysis sp., (96,18%) dan yang terrendah adalah P. cruentum (34,73%). P. cruentum memiliki kadar MUFA tertinggi. Isochrysis sp. memiliki kadar asam lemak tidak jenuh ikatan poli (PUFA) yang lebih tinggi daripada S. platensis.Kata kunci: mikroalga, S. platensis, Isochrysis sp., P. cruentum, asam lemak, pertumbuhan spesifikMicroalgae is cell factory that is capable of converting carbon dioxide to potential biofuel, foods and high-value bioactive with sunlight assistance. The purpose of this study is to analyze the specific growth rate and fatty acid content of S. platensis, Isochrysis sp., P. cruentum. Cultivation of pure microalgae is conducted in laboratory for 8 days with media Guillard/f2. Extraction process is conducted using soxhletation method and hexane as the solvent. Fatty acid profile and content in microalgae is performed using gas chromatography mass spectrometry (GC-MS). The highest density of microalgae found at day 8 cultivation. The highest specific growth rate found in P. cruentum in 0.37/day. The highest and lowest total of fatty acid concentration found in Isochrysis sp. (96.18%) and P. cruentum (34.73%) respectively. P. cruentum has the highest levels of saturated fatty acids (SFA), whereas S. platensis has the highest levels of mono unsaturated fatty acid (MUFA). Isochrysis sp. has lower levels poly unsaturated fatty acid (PUFA) than S. platensis.Key words: microalgae, S. platensis, Isochrysis sp., P. cruentum, growth rate, fatty acid

Kelimpahan dan Pola Sebaran Kerang-kerangan (Bivalve) di Ekosistem Padang Lamun, Perairan Jepara Ita Rinitasih; Widianingsih Widianingsih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 1 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Beberapa bivalve yang hidup di habitat padang lamun dipengaruhi oleh berbagai faktor antara lain tegakan dan jenis lamun, jenis substrat, kandungan bahan organik pada sedimen serta dipengaruhi oleh parameter lingkungan dan kualitas air. Pengambilan sampel bivalve dilakukan secara random dengan memperhatikan mintakat perairan yang memiliki hamparan padang lamun yang cukup luas. Berdasarkan hasil penelitian Thaiassia hemprichii mendominansi jenis lamun dengan nilai kerapatan 195 ind/m2 sampai dengan 598,3 ind/m2, Anadara ferruginea mendominasi bivalve di perairan Teluk Awur dengan nilai kelimpahan rata-rata 2,25 ind/m2., kemudian diikuti oleh Gafrarium tumidum. (1,75 ind/m2). Hal ini menunjukkan bahwa Anadara ferruginea dan Garrarium tumidum berassosiasi dengan lamun Thaiassia hemprichii. Pola sebaran A. ferruginea merata untuk semua stasiun, namun untuk G. tumidum pola sebaran cenderung mengelompok.Kata kunci : bivalve, lamun, kelimpahan, distribusiSome of bivalves that live in seagrass ecosystem have been influenced by many factors, those are seagrassspecies, substrate and organic matter that are found in sediment, environment and water qualities factors.Bivalve sampling were taken randomly which gave attention on the waters that has vast seagrass bed. Theresult showed that in Teluk Awur water, the most dominance of seagrass species is Thalassia hemprichiiwhich has density value 195 ind/m2 till 598.3 ind/m2. The dominance bivalve is Anadara ferruginea withaverage of abundance value 2.25 ind/m2 and then followed by Gafrarium tumidum (1,75 ind/m2). Weconclude that Anadara ferruginea and Gafrarium tumidum can grow well and associate with Thalassiahemprichii. According the result, distribution parttern A ferruginea has uniform, and for Gafrarium tumidumhas distribution parttern clumped.Key words: Bivalve, Seagrass.

Composition of Juvenile Corals on Different Morphotypes of Substrate at Karimunjawa Archipelago, Indonesia Munasik Munasik; Diah Permata Wijayanti; Retno Hartati; Rudi Pribadi; Yoko Nozawa
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 4 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Patterns of coral recruitment are partially explained by fitness consequences of substrate selection, and may be affected by substrate morphology. This study examined juvenile coral assemblages on morphologically different dead coral substrate in shallow water reefs (4-5 m) at Karimunjawa Island, Java Sea (Indonesia). Surveys on juvenile corals were performed using 0.5×0.5 m transects on two different morphotypes of natural substrate; tabular dead corals (stable) and branching dead corals (unstable). Results showed that the morphological characteristics of dead coral substrate had a significant influence on the generic composition of juvenile corals. Coral recruits on tabular dead coral substrate (stable) which composed micro-cervices was more diverse than on branching dead coral substrate (unstable). Juvenile corals of the genus Acropora were dominant on (exposed microhabitats of) tabular dead coral substrate, while those of the genus Fungia and Montipora were dominant on (cryptic microhabitats of) branching dead coral substrate. These results suggest that Acroporid juveniles can besettled to the various morphotypes of the substrate, thus the distribution pattern of juvenile corals in shallow reef Karimunjawa may correlate with the distribution pattern of natural substrates.Keywords: juvenile, microhabitat, dead coral, substrate Karimunjawa Archipelago

Metode Lepas Dasar dengan Model Cidaun pada Budidaya Eucheuma spinosum (Linnaeus) Agardh AB Susanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 3 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Rumput laut tergolong dalam algae sebagai tumbuhan yang tidak dapat dibedakan antara akar, batang dan daun, sehingga seluruh bagian tumbuhan disebut thallus. Tujuan dari penelitian ini adalah untuk mengetahui laju pertumbuhan harian Eucheuma spinosum dengan metode lepas dasar menggunakan model Cidaun di perairan Karimunjawa. Selama penelitian berlangsung diukur kualitas air meliputi salinitas, temperatur, pH, kecerahan, arus, sedimentasi dan kedalaman. Eucheuma spinosum sebagai materi penelitian diambil dari lokasi budidaya rumput laut SMKN Karimunjawa, Jepara dan penelitian ini dilaksanakan di selat Takak Alu-alu, perairan Karimunjawa, Jepara antara bulan Oktober dan November 2003. Model Cidaun adalah teknik budidayarumput laut yang digunakan khusus untuk daerah berombak besar dengan menggunakan jaring kantong untuk melindungan thallusnya. Metode penelitian ini adalah eksperimen dengan Rancangan Acak Lengkap pola faktorial 2 x 2. Perlakuan terdiri dari jarak tanam (2 m dan 1,5 m) dan kedalaman (70 cm dan 100 cm) dengan 5 ulangan. Berdasarkan hasil penelitian, membuktikan bahwa penggunaan jaring kantong sebagai model Cidaun tidak begitu efektif, bila dilakukan pada musim pancaroba (Oktober-Desember) karena ombak relatif tenang. Sehingga memudahkan tumbuhnya lumut dan epifit lainnya yang mengganggu pertumbuhan Eucheuma spinosum. Berdasarkan analisa sidik ragam terdapat beda nyata pada kedalaman dan interaksi antarperlakuan.Kata kunci : Laju pertumbuhan harian, Eucheuma spinosum, model CidaunSeaweed belongs algae which can not distinguishable among root, leaf and stem, all of parts called thallus. This experiment was aimed to know growth rate of Eucheuma spinosum use off bottom method with theCidaun’s model at Karimunjawa waters. The water quality was measured during this experiment such as: salinity, temperature, pH, water brightness, current, sediment, and depth. This experiment used Eucheuma spinosum from the cultivation area of SMKN Karimunjawa, Jepara and was carried out at Takak Alualu bay, Karimunjawa waters, Jepara between Oktober and November 2003. The Cidaun’s model is a technique ofseaweed culture used special for the strong wavy area which is using net bag to protect plants. The experimental design used factorial 2 x 2 based on Completely Randomized Design and five replications. The treatmentswere planting distances ( 2 m and 1.5 m) and deepness factors (70 cm and 100 cm). Based on the result explained that the Cidaun’s model was not effective if it is applied during the transition season (October-December), because the wave was relatively calm. That way it made easy mosses and associated plant and it effected the growth rate of Eucheuma spinosum. The result of statistical analysis showed that there weresignificant differences between deepness and the interaction among treatments.Key words : Daily Growth Rate, Eucheuma Spinosum, Cidaun’s model, net bag, depth and distance.

Bioaktivitas Ekstrak dan Serbuk Lamun Enhalus acoroides dan Thalassia hemprichii pada Vibrio alginolyticus dan Vibrio harveyii Ita Riniatsih; Wilis Ari Setyati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 3 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Vibriosis merupakan penyakit bakterial yang menyerang udang antara lain disebabkan oleh Vibrio alginolyticus dan Vibrio harveyii. Salah satu upaya perlindungan udang terhadap infeksi vibriosis adalah melalui reduksi jumlah bakteri vibrio di media budidaya dan saluran pencernaan udang. Penelitian ini bertujuan untuk mendapatkan justifikasi pemanfaatan ekstrak dan serbuk simplisia lamun Enhalus acoroides dan Thalassia hemprichii sebagai agensia pengendali bakteri vibrio. Beberapa penelitian membuktikan bahwa lamun mempunyai aktivitas antibakteri. Oleh karena itu perlu dilakukan pengujian jenis lamun lain dan terhadap strain strain bakteri vibrio pathogenik pada udang. Penelitian dilakukan dengan metode eksperimental. Sampel E. acoroides dan T. hemprichii diekstraksi dengan air panas. Pengujian aktivitas antibakteri dilakukan secara in vitro menggunakan agar disc diffusion method. Hasil penelitian menunjukan bahwa ekstrak dan serbuk simplisia E. acoroides tidak menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Ekstrak T. hemprichii menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Sedangkan serbuk simplisia T. hemprichii menunjukan aktivitas antibakteri terhadap V. alginolyticus dan V. harveyii setelah 48 jam inkubasi Kata kunci : antibakteri, ektrak panas, serbuk, lamun, vibriosis Vibriosis is a bacterial diseases in prawn which caused by Vibrio including Vibrio alginolyticus and Vibrio harveyii. An effort to protect the prawn of vibrio infection is by reducing the number of vibrio bacteria either in the culture media and/or in the gastrointestinal system of the cultured species. The research aimed to find justification for the use of seagrasess Enhalus acoroides and Thalassis hemprichii as vibrio bacteria control agensia. The research was conducted by experimental method. The initial phase of the study was testing the antibacterial activity in vitro using agar disc diffusion method. The result shows that neither extract nor simplicia of E. acoroides have an effect against the growth of V. alginolyticus and V. Extract of however, significantly shows bioactivity respond against those bacteria and its simplicia powder also showing a similar effect but after 48 hours of incubation. Key words : antibacterial, hot water extract, powder, seagrass, vibriosis

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