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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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Published by Universitas Diponegoro

ISSN : 08537291 EISSN : 24067598 DOI : -

Core Subject : Science,

Earth & Planetary Sciences

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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Kelimpahan dan Sebaran Horizontal Fitoplankton di Perairan Pantai Timur Pulau Belitung Widianingsih Widianingsih; Retno Hartati; Asikin Djamali; Sugestiningsih Sugestiningsih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 1 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini dilakukan dengan tujuan untuk mengetahui kelimpahan dan sebaran horizontal Fitoplankton di perairan Pantai Timur Pulau Belitung. Pengambilan sampel Fitoplankton pada Oktober 2006 dilakukan dengan menggunakan plankton net Kitahara yang mempunyai ukuran mata jaring 80 \im pada 10 stasiun. Kelimpahan total Fitoplankton berklsar antara 16.205-54.835 sel/m3 dan Fitoplankton dari kelas Bacillariophyceae mendomlnansl perairan tersebut. Genus yang dominan di perairan ini dan selalu ada di setiap stasiun adalah Rhizosolenia dengan kelimpahan tertinggi (25.969 sel/m3) di stasiun 1 yang merupakan stasiun terluar dengan nlai salinitas 32,64-32,95 psu. Kelimpahan fitoplankton tertinggi terjadi di stasiun ke 4 dan genus Asterionella mendominasi dengan nilai 28,693 sel/m3. Pola sebaran horizontal dengan konsentrasi tertinggi terdapat di stasiun ke-4 dengan nilai kelimpahan lebih dari 50.000 sel/m3 Kata kunci: kelimpahan, distribusi, fitoplankton, Pulau BelitungThis research had purpose to examine abundance and horizontal distribution of phytoplankton in the water of East Belitung Island. Phytoplankton samples were taken on October 2006 from 10 stations used Kitahara plankton net has mess size net 80 μm. The result revealed that the total abundance of phytoplankton during the survey in the range of 16.205 cell/m3 up to 54.835 cell/m3 and phytoplankton from class Bacillariophycea dominant on that water. The predominant genera of phytoplankton for all of stations was Rhizosolenia with highest abundance (25.969 cell/m3) on the station 1 which located in the outside of station had salinity value 32,64 psu till 32,95 psu. The highest abundance of phytoplankton was occurred on the Station 4 had value 54.835 cell/m3 and the genera of Asterionella was dominated on that that time with value 28,693 cell/m3. According the result show that horizontal distribution pattern has the highest concentration on the station 4, has phytoplankton abundance value more than 50.000 sel/m3.Key words : Abundance, Phytoplankton, Pulau Belitung

Effects of Microencapsulated Synbiotic Administration at Different Dosages against heavy co-infection of White Spot Disease (WSD) and Vibrio harveyi in Pacific White Shrimp (Litopenaeus vannamei) Yunarty Yunarty; Munti Yuhana; Widanarni Widanarni
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 4 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

White spot disease (WSD) is one of infectious disease in shrimp caused by white spot syndrome virus (WSSV). This study aimed to determine the dosage immunological effects and growth performances of microencapsulated synbiotic (Bacillus NP5 and mannan oligosaccharide) at different dosages on Pacific white shrimp. The microencapsulated synbiotic was administered as feed supplementation against the co-infection of WSSV and Vibrio harveyi. Synbiotic was encapsulated by spray drying method, further feed supplemented to Pacific white shrimp for 30 days at a dosages of 0.5% (A), 1% (B), 2% (C) and control treatments, i.e. without any microencapsulated synbiotic administration as positive control (D) and negative control (E). The challenge test was performed on day 30 after feeding supplementation, then the experimental shrimps were injected by WSSV intramuscularly at the infective dosage of 104 copies.-ml-1. Afterwards, 24 hours after WSSV injection the shrimps were immersed in water contained cells suspension of V. harveyi at the cells population dosage of 106 CFU-.ml-1. All synbiotic treatments showed better results with the values of Total Haemocyte Count (THC), Phenoloxidase (PO) and Respiratory Burst (RB), were higher (P<0.05) compared to positive control. The specific growth rates (SGR) of A, B and C showed higher than both controls of D and E. The feed conversion ratio (FCR) value of synbiotic treatments were lower (P<0.05) than both controls. However, the administration of microencapsulated synbiotic have not been able to prevent heavy impact of WSSV and V. harveyi co-infection due to lower SR and mortality pattern which continued to increase. Keywords: Synbiotic, Litopenaeus vannamei, WSSV, Vibrio harveyi, co-infection

Kajian Temporal Indeks Pencemaran Akibat Pengaruh Limbah Domestik dan Pola Penyebarannya di Perairan Pantai Kartini, Jepara Tonny Bachtiar; Uswatun Khasanah; Ocky Karna Radjasa; Edi Suhartono; Agus Hardiyanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 4 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini dilakukan pada kondisi musim kemarau (Agustus 2003, monsun Timur), dan pada kondisi musim hujan (Maret 2004, kondisi monsun Barat), pada tiga kondisi lingkungan, yaitu: sungai dan muara Sungai Demaan, dan perairan pantai Kartini Jepara. Pengukuran beberapa parameter kualitas air dan pengambilan sampel air dilakukan pada 12 stasion. Dengan menggunakan metoda Indeks Pencemaran (pollution indexs) diketahui bahwa indeks pencemaran pada kondisi musim kemarau mempunyai nilai yang lebih tinggi dari pada kondisi musim hujan, baik di lingkungan sungai, muara, naupun perairan pantai. Kondisi lingkungan sungai pada kondisi musim kemarau mempunyai kriteria pencemaran cemar berat, dengan IP 11,48, pada kondisi musim hujan menjadi cemar ringan, dengan IP 4,49. Pada kondisi lingkungan muara saat musim kemarau, termasuk cemar sedang dengan IP 6,71, sedangkan pada kondisi musim hujan menjadi cemar ringan, dengan IP menjadi 3,11. Status mutu air di perairan pantai ke arah laut hingga stasiun kontrol termasuk dalam cemar ringan, baik pada kondisi musim kemarau maupun kondisi musim hujan. Secara umum pola penyebaran Indeks Pencemaran pada monsun Timur dan monsun Barat, mempunyai pola yang relatif tinggi di sekitar muara dan menurun dengan meningkatnya jarak dari muara, dan tersebar mengikuti dinamikaperairan ke Selatan, kemudian ke Baratdaya mengikuti bentuk pantai Teluk Kartini.Kata kunci: indeks pencemaran, monsun, muara, perairan pantai, sungaiThis research was conducted on the condition of dry season (August 2003, East monsoon), and the condition of wet season (March 2004, West monsoon), on three environmental conditions: river and river mouth ofDemaan River, and Kartini coastal waters, Jepara. Measurement of several water quality parameters and collecting of water samples was carried out at 12 stations. By using Pollution Index method, it could be recognized that pollution indexes (PI) in the river, river mouth, and coastal waters during dry season were higher than during wet season. In the river environment during dry season was heavy polluted with PI 11.48,and during wet season became light polluted with PI 4.49. River mouth environment during dry season was fairly polluted with PI 6.71, and during wet season became light polluted with PI 3.11. The status waterquality of coastal water to the sea direction until control station was in light polluted, both in dry and wet seasons. In general, the pattern distribution of PI in East and West monsoon were relatively higher around theriver mouth and decreased with increasing of distance from the river mouth, and distributed by dynamic of waters to the South, and then to the Southwest went along the coast of Kartini Bay.Key words: pollution index, monsoon, river mouth, coastal waters, river.

Arus Rip di Perairan Pesisir Pangandaran, Jawa Barat (Rip Current in Pangandaran Coastal Water, West Java) Edi Kusmanto; Wahyu Budi Setyawan
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 18, No 2 (2013): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Perairan pesisir Pangandaran adalah bagian dari perairan pesisir Teluk Parigi dan merupakan bagian yang paling tenang. Keadaan tersebut menyebabkan pantai Pangandaran berkembang menjadi tempat tujuan wisata pantai yang terkenal. Penelitian dilakukan di bagian pantai dimana arus rip diketahui sering terjadi. Gambaran tentang arus rip dilakukan dengan pengamatan visual dan pendekatan analisis kondisi morfologi pantai, batimetri atau morfologi dasar laut, kondisi gelombang, kecepatan dan arah arus, serta kekeruhan. Hasil penelitian ini menunjukkan bahwa arus rip merupakan kejadian yang umum di kawasan pesisir Teluk Parigi, dan sering muncul di bagian tertentu pantai Pangandaran yang telah dipandang aman. Swell dengan kisaran periode 6,57– 8,91 dt dari Samudera Hindia dengan arah hampir tegak lurus garis pantai diduga merupakan gelombang pencetusnya. Hasil penelitian menunjukkan enam arus rip dengan kecepatan berkisar dari 0,8–1 m.dt-1. Rekaman data kekeruhan membuktikan arus rip tersebut membawa muatan sedimen dari tepi pantai ke tengah laut. Data batimetri di lokasi penelitian memperlihatkan adanya morfologi dasar laut yang bergelombang membentuk punggungan dan lembah memanjang dari pantai ke arah laut lepas. Posisi kejadian arus rip yang tidak spesifik di lembah atau punggungan menunjukkan tidak adanya kontrol morfologi dasar laut terhadap kejadian arus rip. Kata kunci: arus rip, swell, pantai pasir, perairan pesisir, Pangandaran Pangandaran coastal waters is coastal tourism site that situated at the calmest part of Parigi Bay coastal waters. The favorable coastal area condition has made the coastal zone growth to be favorite coastal tourism site. The study site was coastal segment where rip currents frequently occur. This research was conducted by visual observation of rip currents and coastal morphology analysis approach, bathymetry survey, wave conditions, the speed and direction of currents, and turbidity. Results of this study indicate that rip currents are common phenomena at the Parigi Bay coastal area, and the currents frequently occur at several parts of the Pangandaran coastal zone, which are supposed to be safe. The rip currents could be identified visually. Swell with periods of 6.57 to 8.91 s propagating from the Indian Ocean in nearly normal direction to the coastline of Pangandaran could be the cause of rip currents. During field work of this study, it was recorded the existing of six rip currents with speeds in the range of 0,8–1 m.s-1. Obtained backscatterance records indicated that the recorded rip currents transport sediment load seaward from swash zone. Bathymetry data records of the study area showed an existing of undulating submarine morphology with axis lines normal to coastline. However, position of the rip current occurrence had no a good correlation with the undulating morphology. The facts indicate that no control of seabed morphology on rip current occurrence. Keywords: rip current, swell, sandy beach, coastal waters, Pangandaran

The Identification of Carotenoids and Testing of Carotenoid Antioxidants from Sand Lobster (Panulirus homarus) Egg Extract James Ngginak; Jubhar C Mangibulude; Ferdy S Rondonuwu
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 3 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Sand lobsters (Panulirus homarus) are organisms that play an important role in supporting a society’s economy. Lobsters have a business appeal due to their high demand, enjoyable taste, as well as significant nutritional content. It is interesting that sand lobster eggs have a yellow orange color as an indicator of the presence of carotenoid content. Related with advancements in research and the utilization of carotenoids, this research identifies carotenoids and tests carotenoid antioxidants from sand lobster (Panulirus homarus) egg extract. In identifying carotenoids in sand lobster egg extract, HPLC (high performance liquid chromatography) (shimadzu LC-10AD, Japan) is used. In testing carotenoid antioxidants from sand lobster eggs, a DPPH method is utilized. The identification results with HPLC reveal that the sample contains carotenoids. The kinds of carotenoids identified are dinoxanthin, diadinoxanthin, zeaxanthin, lutein, astaxanthin, and violaxanthin. Among the six kinds of carotenoids identified, lutein is the type of carotenoid that has the highest concentration. These carotenoid compounds are detected in wavelengths of 400-500 nm. The test results of antioxidant power reveal that to hamper free radicals (IC50), a sample concentration of 6675.25 µg.ml-1 is needed. The ability to hinder free radicals from a sample extract is mostly conducted by lutein, zeaxanthin, and astaxantin. If seen from the analytical results, it can be surmised that sand lobster eggs contain carotenoids that can be used as a carotenoid source for humans. Keywords : Sand Lobster, HPLC, Carotenoids, DPPH, Antioxidant

Komposisi Makanan Ikan Tetet, Johnius belangerii Cuvier (Pisces: Sciaenidae) di Perairan Pantai Mayangan, Jawa Barat M F Rahardjo; Charles P.H. Situmorang
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 2 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian dilaksanakan selama enam bulan dari bulan November 2002 – April 2003, dengan tujuan mengkaji menu makanan ikan tetet (Johnius belangerii Cuv.) di perairan pantai Mayangan. Penangkapan ikan contoh dilakukan sebulan sekali dengan menggunakan jaring insang dan jaring rampus dengan mata jaring 1,5 – 3 inci. Jumlah ikan yang dikumpulkan sebesar 1.548 ekor dengan kisaran panjang total 71- 225 mm. Kebiasaan makanan dihitung dengan metode indeks bagian terbesar. Hasil penelitian menemukan bahwaPenaeus semisulcatus, Acetes, dan Clupea fimbriata merupakan makanan utama ikan ikan tetet. Tidak terjadi perubahan dalam variasi makanan, kecuali perubahan dalam proporsinya setiap bulan.Kata kunci: makanan, ikan tetet, indeks bagian terbesar, perairan pantaiThe research was conducted during six months from November 2002 – April 2003 in order to investigate the diet composition of belanger crokers (Johnius belangerii Cuv.) in Mayangan coastel waters. Fish samples were captured using gillnet and bottom gillnet with mesh sizes varying from 1,5 – 3 inch.The number of fish collected was 1,548 fish, which total length ranged 71-225 mm. For food habits analysis, the index of preponderance method was used. The result indicates that the main foods are Penaeus semisulcatus, Acetes, and Clupea fimbriata. Monthly diet shift change does not occur in organism, but their proportion.Key words: diet, belanger’s croaker, index of preponderance, coastal waters

Sedimentary Environments of the Inshore Pemangkat Region Sambas, West Kalimantan (Lingkungan Sedimen di Perairan Pemangkat, Sambas, Kalimantan Barat) Tubagus Solihuddin; Gunardi Kusumah
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 1 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Peningkatan produk-produk perikanan melalui industrialisasi dengan menekankan pada pengembangan perikanan budidaya laut yang membutuhkan data pendukung lingkungan laut termasuk sediment dasar laut. Penelitian lingkungan sedimen di Perairan Pemangkat bertujuan untuk mendapatkan informasi mengenai komposisi sedimen permukaan dasar laut, konsentrasi mineral logam dan total padatan tersuspensi. Beberapa sampel sedimen permukaan telah diambil pada transek yang telah ditentukan di sekitar Pantai Pemangkat dan telah dilakukan analisis mengikuti prosedur analisis granulometri, sedangkan metode AAS diterapkan untuk menentukan konsentrasi mineral logam. Selain itu, beberapa sampel air laut juga telah diambil menggunakan botol Nansen untuk mendapatkan total padatan tersuspensi. Informasi tersebut sangat bermanfaat bagi manager dan atau pemerintah daerah dalam menilai, merencanakan dan mengelola kawasan peisir dan lingkungan laut. Standar kualitas air yang dikeluarkan oleh Kementerian Negara Lingkungan Hidup digunakan sebagai acuan untuk mengkalibrasi hasil penelitian. Studi ini menunjukkan dominasi sedimen lumpur dan tingginya konsentrasi TSS, mengindikasikan bahwa Perairan Pemangkat tidak direkomendasikan untuk pengembangan kawasan perikanan budidaya laut. Kata kunci: sedimen, mineral logam, total padatan tersuspensi Increasing fisheries products through industrialisation with emphasizing on marine aquaculture development requires supporting data on marine environments including seafloor sediments. Research on sedimentary environments of the inshore of Pemangkat region was aimed to obtain seafloor sediment composition, heavy metal and total suspended solid (TSS) concentrations. Some surface sediments samples were collected in transects across the selected Pemangkat coast and analysed following the procedure of granulometric analysis, whilst AAS (Atomic Absorption Spectroscopy) was applied to determine heavy metal concentrations (e.g. Hg, Pb, Cd, Cu, and Zn). Additionally, water samples were also collected using Nansen bottle to derive TSS concentrations. This sort of information will be valuable for manager and/or local government to assess, plan and manage coastal zone and marine environment. A standard of water quality issued by the State Ministry for Environment was then used as a reference to calibrate the results. This study showed silt (mud) sediment dominance and high TSS concentrations, indicating that the inshore Pemangkat region was not highly recommended for marine aquaculture development. Keywords: sediment, heavy metal, total suspended solid

Dolphins Encountered in Kepulauan Seribu Yusli Wardiatno; Chikarista Irfangi; Totok Hestirianoto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 4 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Kepulauan Seribu has been considered as one of the dolphin migration routes. This is based on the number of reports from fishermen and communities in Kepulauan Seribu on the existence of cetacean. The purpose of this study was to assess the type, behavior, deployment location, and estimate the number of dolphins found in Kepulauan Seribu. Research was conducted on May 10th to May 27th, 2010 and 22nd June to 3 July 2010. Observations were made every day, except Friday, and started at 7:00 a.m. to 6:00 pm. Observation by boat was used in the research. Observation of the amount, type, and behavior of cetacean had been done visually. Based on research results, it can be concluded that the species of dolphins found in Kepulauan Seribu are Delphinus delphis, Pseudorca crassidens, Stenella longirostris, and Tursiops truncatus, with a total number of 145 individuals. Species of dolphins are most often found is T. truncatus, whereas the least common type is Delphinus delphis. In addition there are also calf and unidentified species. The location of the encounter with the dolphins most often occurs around Pulau Gosong Congkak (Karang Congkak) and Karang Lebar. Judging from the observed behavior, it can be said that Kepulauan Seribu is a foraging area and migration routes for cetacean. In addition, Kepulauan Seribu was also considered as nursery ground for calf. Key words : Cetacean, dolphin, Kepulauan Seribu Kepulauan Seribu diduga sebagai salah satu rute migrasi berbagai jenis lumba-lumba. Hal ini didasarkan pada jumlah laporan dari nelayan dan masyarakat di Kepulauan Seribu pada keberadaan lumba-lumba. Tujuan dari penelitian ini adalah untuk menilai jenis, perilaku, lokasi penyebaran, dan estimasi jumlah dan jenis Cetacean yang ditemukan di Kepulauan Seribu. Penelitian ini dilakukan pada 10-27Mei dan 22 Juni-3 Juli 2010. Pengamatan dilakukan setiap hari, kecuali hari Jumat, mulai jam 7:00-18:00. Penelitian ini menggunakan metode eksplorasi dengan menggunakan perahu motor. Pengamatan jenis, jumlah, dan perilaku lumba-lumba telah dilakukan secara visual. Berdasarkan hasil penelitian,dapat disimpulkan bahwa spesies lumba-lumba yang ditemukan di Kepulauan Seribu adalah Delphinus delphis, Pseudorca crassidens, Stenella longirostris, dan Tursiops truncatus, dengan jumlah total 145 individu. Spesies lumba-lumba yang paling sering ditemukan adalah T. truncatus, sedangkan tipe paling umum adalah Delphinus delphis. Selain itu ditemukan juga bayi lumba-lumba dan spesies yang tidak teridentifikasi. Lokasi perjumpaan dengan lumba-lumba paling sering terjadi di sekitar Pulau Gosong Congkak (Karang Congkak) dan Karang Lebar. Dilihat dari perilaku yang diamati, dapat dikatakan bahwa Kepulauan Seribu merupakan daerah mencari makan dan rute migrasi Cetacean. Selain itu, Kepulauan Seribu juga diduga sebagai daerah asuhan bagi bayi lumba-lumba. Kata kunci : Cetacean, lumba-lumba, Kepulauan Seribu

Effect of Cadmium (Cd) on The Structure of Gill and Epipodite of Penaeid Shrimp, Penaeus japonicus Bate (Crustacea, Decapoda) Bambang Yulianto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 7, No 2 (2002): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Efek toksisitas sublethal cadmium terhadap struktur insang dan epipodite dari udang Penaeus japonicus dipelajari. Setelah pemaparan selama 4 hari, kadmium merubah struktur insang dari udang, akumulasi hemocyte dalam vena dan Iamela, epithelium insang mengalami disorganisasi dan kanal hemolympha distal menjadi buntu. Struktur dari epipodite juga terganggu: cadmium menyebabkan nekrosis pada permukaan. Kerusakan struktur insang dan epipodit ini menjadi argumen penurunan kapasitas hypo- dan hyper-osmoregulasi udang ini. Kata kuncl: kadmium, struktur, Penaeus japonicus, insang, epipodite. The effect of sublethal toxicity of cadmium on the structure of gill and epipodtte of the shrimp Penaeus japonicus was studied. After 4 days of exposure, cadmium affected the gill structure of shrimp: hemocyte accumulate in vessels/channelsand lamellas, the gill epithelium is disorganised and the distal hemolymphatic lacuna is clogged. The structure of epipodites is also altered: cadmium causes superficial necrosis. The damage of gill and epipodite structure becomes a reason on the decrease of hypo- and hyper osmoregulatory capacity in this shrimp.Keywords: cadmium, structure, Penaeus Iepontcus. gill, epipodite.

Pengaruh Kepadatan Terhadap Tingkat Kematangan Gonad dan Fekunditas Kepiting Bakau (Scylla serrata) pada Kultivasi di Tambak Garam Hadi Endrawati; Muhammad Zainuri; Chrisna A Suryono; Suryono Suryono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 4 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini bertujuan untuk mengetahui kematangan gonad dan fekunditas kepiting bakau (Scylla serrata) dengan sistem kultivasi dalam karamba di tambak garam berdasarkan perlakuan kepadatan benih yangberbeda.Benih kepiting berjumlah 144 ekor dengan berat awal rata-rata 250 gram, terbagi kedalam empat perlakuan kepadatan, masing masing A ( 6 ekor ), B ( 8 ekor ), C ( 10 ekor ) dan D ( 12 ekor ), yang masing– masing diulang empat kali dipelihara dalam karamba berukuran 1 x 0,75 x 1 meter. Pemeliharaan dilakukan selama 2 minggu ( 8 – 23 Oktober 2001 ). Hasil pengamatan kematangan gonad berdasarkan dianalisis berdasarkan Indeks Kematangan Gonad serta fekunditas. Kematangan gonad kepiting bakau Scylla serrata tercapai secara merata dengan indeks berkisar diantara 42.87 – 68.70, dengan indeks tertinggi sebesar 65.12 ± 2.39 pada perlakuan C ( kepadatan 10 ekor per 0.75 m 2 ). Sedangkan fekunditas berkisar diantara 60000 –120000 butir telur, dengan perlakuan tertinggi dicapai pada perlakuan B dengan kisaran jumlah telur 96000 – 120000 dan nilai rata – rata 110000 ± 12000 butir telur. Hubungan berat kepiting dengan fekunditas total Y = 567.9562 – 103477.337 X ( r = 0.7966 ). Fekunditas memberikan hasil linier menurun berdasarkan perlakuan dikarenakan kemampuan toleransi serta ruang gerak yang terlalu sempit dan persainganKata kunci : kepadatan, kematangan gonad, fekunditas, kepiting Scylla serrata.The aim of the research is to know the effect of different density on the gonad maturity and fecundity of mud crab ( Scylla serrata ) grown in the cage. This cage were put in salt water pond. Four treatments (density ), i.e. A ( 6 individual ), B ( 8 individual ), C ( 10 individual ) and D ( 12 individual ), with four replications, were applied. The average initial weight of the mud crab is 250 gram. These were grown for two weeks ( October 8 to 23, 2001 ). The mud crab gonad maturity and fecundity was analysed using the analysis based on the Gonad Maturation Index and Fecundity. The gonad maturity was found for almost of mud crab Scylla serrata. The gonad maturity index showed a value from 42.87 – 68.70, which the highest was reached by the treatment C ( with the density 10 individual per 0.75 m 2 ). The fecundity varies from 60000 –120000 eggs, which the highest was 110000 ± 12000 and reached by the treatment B ( with the density 10 individual per 0.75 m 2 ). The relationship between mudgrab weight and fecundity was Y = 567.9562 – 103477.337 X (r = 0.7966). The fecundity showed a decreased linierity due to the limitationspace cause by the level of density.Key words : density, gonad maturation, fecundity, mud crab Scylla serrata

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