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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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Articles 743 Documents

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Kualitas Media Pemeliharaan Larva Lola Merah dan Kima Sisik Hasil Filtrasi Bertingkat di Hatchery Magdalena Litaay; Risco B. Gobel; As'adi Abdullah; Serii Lejab
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 1 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Telah dilakukan studi kualitas media pemeliharaan larva lola merah dan kima sisik. Pengambilan sampel air dilakukan pada 4 stasiun yaknh A (sumber air laut); B: penyaringan I (ijuk); C (filter bagganda WA dan I 'A); dan D (airdalam bak budidaya). Pemeriksaan mikrobiologis meliputi uji kuantitatif (SPC dan MPN) dan kuaiitatif (makroskopi, mikroskopis dan uji biokimia). Hasil analisis SPC menunjukkan total bakteri pada stasiun A, B, C dan D (5.0 x 107; 1.8 x 10s; 8.0 x 10* dan 8.6 x 105 bakteri/ml), sedangkan MPN: 11 x 102; 4.3 x 10'; 0.73 x 10' dan 11 x 102 bakteri/ml). Hasil pengamatan morfologi koloni bakteri pada stasiun A, teridentifikasi 6 isolat (A 1, AZ, A3, A4, A5, dan A6), Stasiun B,C dan D masing-masing ada 4 isolat Isolat A1, AZ, A3, A4, Bl, BZ, Cl, CZ, DI dan DZ bersifatgram positif, sedangkan A5, A6, B3,B4, C3, C4, D3 dan D4 bersifatgram negatif. Isolat Al, AZ, A4, Bl, BZ, Cl, CZ, Dl dan DZ membentuk spora, sementara A3, A5, A6, B3, B4, C3, C4, D3 dan D4 tidak membentuk spora. Isolat yang teridentifikasi memiliki kesamaan sifat dengan bakteri genera Escherichia, Bacillus, Micrococcus, Pseudomonas dan Streptomyces. Sistem filtrasi air laut masih layak.Kata kunci: bakteri laut, Trochus niloticus L, Tridacna squamosaThe study on the quality of larval rearing media of the top shell and scally giant clam had been done. Watersamples was collected at 4 station: A) sea water; B: filtarion I; C: filtration 2 (fillter bag 10 ¼ and 1 ¼ ); D:inside larval rearing tank. Microbiology assay including quantitaive (SPC and MPN), and qualitative test(macroscopy, microscopic and biochemistery) were conducted on samples. The SPC results shows total bacteriaat station A, B, C and D are 5.0 x 107; 1.8 x 106; 8.0 x 104 and 8.6 x 106 bacteria/ml, while MPN indicates:11x 102; 4.3 x 101; 0.73 x 101 dan 11 x 102 bacteria/ml, respectively. Six isolates bacteria were identified atstation A (A1, A2, A3, A4, A5, and A6), and four isolates in station B,C and D. Isolates A1, A2, A3, A4, B1,B2, C1, C2, D1 and D2 are gram positive, while A5, A6, B3, B4, C3, C4, D3 and D4 are gram negative.Isolates A1, A2, A4, B1, B2, C1, C2, D1 and D2 form spore, on the other hand isolates A3, A5, A6, B3, B4,C3, C4, D3 and D4 not. Identifed isolates show similar characteristics of genera Escherichia, Bacillus, Micrococcus,Pseudomonas and Streptomyces. Filtration system is in vapour condition.Key words: marine bacteria, Trochus niloticus, Tridacna squamosa

Physical and Chemical Conditions of Bayur Bay Waters On the East and West Season Ulung Jantama Wisha; Try Al Tanto; Ilham Ilham
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 1 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Physical construction of Bayur bay coastal area as a port was followed by a variety of environmental issues, both physical degradation of the natural environment, biology reduction and an increase in social problems, directly affect to water quality decreasing in the coastal Bayur Bay. This study aims to determine the concentration distribution of physical and chemical parameters and their influence to water conditions on the east and west season. The method used is descriptive method (data taken by in situ and laboratory analysis), determining the location of sampling points based on purposive sampling method and tide prediction by NAOtide software. The results of field survey and laboratory measurements analysed using statistical method. The speed of sea currents on the east season ranged from 3,48 to 24,9 cm.s-1, while in the West season flow rate ranged from 1,4 to 57,7 cm.s-1. Rainfall in East Season ranged from 0-45 mm and The intensity of rainfall in West Season ranged from 0-30 mm. Sea-surface temperatures in the Eastern season range between 26,2- 31.5 °C, while in the west season SST range from 24,3 to 30,5°C. Dissolve oxygen concentration in the east season range from 4,3 to 6,1 mg.L-1, while the west monsoon conditions range from 4,1 to 6,4 mg.L-1. The pH values ranged from 7,4 to 8,1 in the Eastern season and ranged from 7,12 to 8,27 in the West season. Bayur Bay water quality conditions is not much different from its value range on the west and east season and influencing each other. Keywords: Bayur Bay, Seasons, SST, Statistical method

Distribusi Spasial Fitoplankton di Perairan Teluk Haria Saparua, Maluku Tengah Sara Haumahu
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 3 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Studi tentang komposisi spesies dan kelimpahan fitoplankton dilakukan di perairan Teluk Haria, Pulau Saparua, Maluku Tengah dari bulan Agustus – Oktober 2002. Ada 51 genera fitoplankton dari 5 klas yang ditemukan dimana 39 genera yang berasal dari klas Baccilariophyceae. Chaetoceros, Eucampia, Rhizosolenia dan Thalassionema merupakan genus yang predominan. Analisa MDS dan Cluster menunjukan ada 4 kelompok fitoplankton yang terbentuk berdasarkan kehadiran dan kelimpahannya. Komposisi spesies pada kedalaman 20 m (st. II-20 dan st. III-20) lebih tinggi daripada stasiun lainnya. Kelimpahan fitoplankton tertinggi ditemukan pada kedalaman 5 m (st. III-5) dan terendah pada kedalaman 20 m (st.IV-20).Kata kunci : Distribusi spasial, fitoplankton, komposisi spesies, kelimpahanStudy on phytoplankton species composition and its spatial distribution was carried out from August to October 2002 in Haria Bay of Saparua Island, Central Moluccas. Fifty one genera from five classes werefound in which thirty nine genera of Baccillariophyceae. Chaetoceros, Eucampia, Rhizosolenia, and Thalassionema were predominant genera. Multidimensional Scaling and Cluster analysis showed that there were 4 groups of phytoplankton, which grouped by their present and abundance. Furthermore, their composition at 20 m depth (st.II-20 dan st III-20) were higher than other stations. The highest abundance was found at 5 mdepth (st. III-5), while the lowest was at 20 m depth (st. IV-20).Key words : Spatial distribution, phytoplankton, species composition, abundance

Trace Metals Distribution in Sediment Fractions of Karimata Strait, Indonesia Duaitd Kolibongso; Tri Prartono; Ali Arman
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 4 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The profile concentration of heavy metals, organic matter and the composition of the grain sizes is determined in two sediment cores from Karimata Strait. This study aimed to estimate the distribution of sediment grain sizes and distribution of heavy metals (Pb, Cu, Zn, Ni, As, and Fe) in three sediment fractions (>250 μm, 63-250 μm and <63 m) of Karimata Strait. Sampling was conducted using box core. Graining size analysis was carried out through sieving, continue with digestion, and analyze the heavy metals using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). Results of the study show that the sediment grain size distribution is strongly influenced by the water hydrodynamic condition (currents). It can be seen by the dominance of finding coarse grain size in the research areas. The highest concentration of the heavy metals was found in the finest grain size (<63 m) due to the larger surface area and higher adsorption capacity. Distribution of heavy metals Cu, Pb, Zn and Ni in the upper layer of sediments is higher than in the bottom layer. Furthermore, the As and Fe concentration in the surface were lower than in the bottom layer. Statistical analysis shows an association and a source of heavy metals mainly coming from the surrounding areas. It is supported by the enrichment factor values of finding heavy metals generally has been undergone enrichment.Keyword: Grain sizes,Heavy metals, ICP-OES,Karimata strait, Sediment

Komunitas Cacing Laut Dalam (Polychaeta) di Selat Flores, Lamakera dan Alor (Nusa Tenggara Timur) Pitra Widianwari; Widianingsih Widianingsih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 16, No 4 (2011): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Struktur dan sebaran spasial komunitas cacing laut (Poychaeta) di selat Flores, Lamakera dan Alor dikaji berdasarkan perolehan sampel hasil penurunan box corer di 13 stasiun cuplik berkedalaman 147-2996 m pada bulan Juli 2011. Secara keseluruhan berhasil diperoleh 68 jenis polychaeta (n = 536) yang dapat dikelompokkan kedalam 31 famili dengan kepadatan per stasiun bervariasi antara 9 hingga 95 individu/0.3 m2. Sedangkan kekayaan jenis, nilai indeks keragaman Shannon Wiener (H’) dan kemerataan Pielou (J) masing-masing bervariasi antara 3-24, 1,03-2,93 dan 0,83-0,94. Uji korelasi Spearman mengindikasikan keterkaitan positif antara kepadatan dengan kekayaan jenis (S) maupun H’ (P<0,01). Hubungan antara atribut komunitas tersebut dengan parameter lingkungan (kedalaman, % kerikil, % lumpur dan kandungan total bahan organik) tidak dapat terdeteksi secara jelas, kecuali antara kepadatan dengan kandungan pasir (r=0,56; P=0,05). Kata kunci: Polychaeta, cacing laut ,laut dalam, Nusa Tenggara Timur Spatial distribution and community structure of polychaete community has been studied based on data collected from Flores, Lamakera and Alor straits in July 2011. Polychaetes sample have been obtained using a box corer deployed on 13 sampling stations at waters depths between 147 to 2996 m. In all there has been collected 68 species belong to 31 families with the total individuals varies between 9 - 95 ind./0.3 m2. The species richness (S), Shannon Wiener diversity index (H’) and Pielou’s eveness index (J) consecutively range between 3-24, 1,03-2,93 and 0,83-0,94. Spearman corellation test indicates positive relationship between worm density with species reachness and shannon wiener index. However the relationship between those community attributes and the environmental parameters (water depth, % gravel, sand, mud and TOM) are not significant, except between worm density and % of sand (r=0.56; P=0.05). Key words: Polychaeta, deep-sea, Nusa Tenggara Timur

Distribusi Percampuran Turbulen di Perairan Selat Alor (Distribution of Turbulence Mixing in Alor Strait) Adi Purwandana; Mulia Purba; Agus S Atmadipoera
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 1 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Selat Alor merupakan kanal terdalam setelah Selat Ombai di kepulauan Alor. Kontribusinya sebagai salah satu celah keluar Arus Lintas Indonesia (Arlindo) belum banyak dikaji hingga saat ini. Selat Alor memisahkan Laut Flores dan Laut Sawu, dan memiliki sill yang tinggi di dalamnya, diduga turbulensi akibat interaksi antara aliran selat dengan topografi dasar dapat memicu percampuran dan memodifikasi properti massa air yang melaluinya. Tujuan dari penelitian ini adalah untuk mengkuantifikasi transformasi massa air yang melalui Selat Alor dan mengkaji kemungkinan percampuran di dalam selat berdasarkan estimasi sesaat properti percampuran, yakni percampuran turbulen menggunakan metode skala Thorpe. Penurunan CTD dilakukan di 15 stasiun di perairan Selat Alor. Diperoleh hasil bahwa kontur kedalaman yang menghubungkan Laut Flores dengan Laut Sawu adalah ~300 m pada kanal utama. Salinitas maksimum massa air Subtropis Pasifik Utara (NPSW) dar i Laut Flores di Selat Alor banyak mengalami reduksi akibat intensifnya percampuran yang diduga dipicu oleh topografi dasar dan aliran selat yang menghasilkan turbulensi. Lapisan salinitas maksimum Massa Air Subtropis Samudera Hindia Utara (NISW) pada σθ = 23,5-24,5 terdeteksi di bagian selatan selat (Laut sawu). Jejak massa air NISW menurun dan banyak tereduksi mendekati pintu selatan selat. Intrusi Massa Air Lapisan Menengah Samudera Hindia Utara (NIIW) juga dijumpai di lapisan bawah Laut Sawu, konsisten dengan profil arus pada lapisan bawah. Rata-rata nilai difusivitas vertikal eddy (Kρ) di Selat Alor bagian utara memiliki orde of 10-3 m2 s-1, dan di bagian selatan memiliki orde bervariasi, 10-6-10-4 m2 s-1. Penyempitan celah Selat Alor diduga merupakan pemicu turbulensi tinggi aliran yang berkontribusi pada tingginya nilai difusivitas vertikal. Kata kunci: Arlindo, percampuran turbulen, difusivitas vertikal, Selat Alor Alor Strait is the deepest channel in Alor islands after Ombai Strait. Contribution of the strait as one of the secondary exit passages of Indonesian Throughflow (ITF) has not been studied yet. The strait separates Flores Sea and Sawu Sea, and is featured by the existence of high sill within the strait, suggested that turbulence due to interaction between strait flow and bottom topography could drive mixing and then modify the water mass properties. The purpose of this study is to investigate transformation of ITF water mass and turbulent mixing process with Thorpe scale method. A hydrographic survey has been carried out in July 2011, in which 15 CTD casts were lowered in the strait. The results show that Alor sill depth is about 300 ms in the main gate. Maximum salinity of NPSW from Flores Sea within Alor Strait is significantly reduced due to strong mixing, perhaps driven by bottom topography and strait flow which creates turbulence. NISW (Northern Indian Subtropical Water) with maximum salinity layer at σθ = 23,5-24,5 is dominant in the southern part of Alor Strait (i.e. Sawu Sea). The existence of NIIW (North Indian Intermediate Water) is also found in the deeper layer of Sawu Sea. The average value of vertical eddy diffussivity (Kρ) estimate in the thermocline layer and deep layer in northern part and central part of strait channel is within the order of 10-3 m2 s-1. Lower order of Kρ in the thermocline layer and deep layer were found in southern part of the Strait (Sawu Sea), ranging from 10-6 to 10-4 m2 s-1. These indicate that the existence of sills in the northern part and central part of Alor Strait could drive mixing significantly. Narrowing passage of Alor Strait probably contribute to the high value of vertical eddy diffusivity due to highly turbulence flow. Keywords: Indonesian Throughflow (ITF), turbulent mixing, vertical diffussivity, Alor Strait

Estimasi Produksi Ikan Melalui Nutrien Serasah Daun Mangrove di Kawasan Reboisasi Rhizophora, Nguling, Pasuruan, Jawa Timur Mohammad Mahmudi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 4 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Input nutrien dari serasah daun mangrove merupakan salah satu faktor yang bertanggung jawab terhadap produktivitas perikanan di ekosistem pesisir. Tujuan penelitian ini adalah untuk menganalisis produksi nutrien (N, P) dari serasah daun mangrove, menduga produksi primer fitoplankton dari nutrien hasil pelepasan serasah daun mangrove, menduga daya dukung ekosistem mangrove terhadap produksi ikan. Pengukuran dekomposisi serasah menggunakan litter bag. Pendugaan produksi ikan menggunakan pendekatan metode Beveridge. Hasil penelitian menunjukkan jumlah nutrien yang dilepaskan dari serasah daun mangrove adalah 0,0355-0,0506 g N/m2/hr dan 0,0018-0,0025 g P/m2/hr. Nilai produksi primer cukup tinggi berkisar 452-645 (rata-rata 555±96,77) gC/m2/th. Pendugaan terhadap produksi ikan herbivor berkisar 490-709 (rata-rata 611±106) kg/ha/th; ikan karnivor berkisar 49-71 (rata-rata 61±11) kg/ha/th dan produksi total ikan berkisar 548-780 (rata-rata 672±117) kg/ha/th. Produksi total ikan tersebut menggambarkan potensi produksi ikan dalam satu hektar mangrove akan menghasilkan produksi ikan sebesar 672 kg/th.Kata kunci : mangrove, nutrien serasah, produksi ikan The input of nutrients from mangrove leaf litter is one of the factors responsible for the productivity of fisheries in coastal ecosystems. The purpose of this study was to analyze the production of nutrients (N, P) of mangrove leaf litter, estimate primary production of phytoplankton from nutrient release of leaf litter of mangroves, estimate carrying capacity of fish production of mangrove ecosystem. Measurements of litter decomposition using litter bags. Estimation of fish production using approach method of Beveridge. The results showed the amount of nutrients released from mangrove leaf litter is 0.0355 to 0.0506 g N/m2/day and 0.0018 to 0.0025 g P/m2/day. Primary production value is quite high is 452 to 645 (mean 555±96.77) g C/m2/yr. Estimation of fish production is 490 to 709 (average 611±106) kg/ha/yr of herbivores; 49 to71 (average 61±11) kg/ha/yr of carnivores and total production of fish is 548 to 780 (average 672±117) kg/ha/yr. The total fish production describes potential of fish production in one hectare of mangrove will produce fish production of 672 kg /yr. Key words : mangroves, nutrient litter, fish production

Pengaruh Temperatur dan Photoperiod Terhadap Kematangan Gonad Kepiting Bakau (Scylla serrata) Ali Djunaedi; Adi Santoso; W. Widiatmoko; Sarjito Sarjito
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 7, No 2 (2002): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian dilakukan untuk mengetahui pengaruh photoperiod dan temperatur terhadap pematangan gonad kepiting bakau. Penelitian dilaksanakan di Hatchery Marine Center IImu Kelautan Jepara, dari bulan September 1999 sampai dengan bulan Desember 1999. Metoda penelitan menggunakan rancangan acak lengkap (RAL) faktorial faktor pertama adalah perlakuan photoperiod dengan 2 taraf pelakuan. yaitu shortday dan long-day. Sedangkan faktor kedua adalah perlakuan temperatur yang juga mempunyai 2 taraf perlakuan yaitu 29 oC dan 31 oC. Hasil penelitian menunjukksn bahwa perlakuan dengan kombinasi photoperiod dan temperatur berpengaruh terhadap perkembangan gonad kepiting bakau. Urutan besarnya nilai lndek kematangan gonad (IKG) adalah 25,41 (A 1B I); 22,06 (A 1B2):20,77 (A2B I) dan 19,88 (A2B2). Hasil analisis regresi nilai simpangan (b) dari persamaan garis menunjukkan nilai IKG terbaik dicapai pada perlakuan short-day dan temperatur 29oC (A 1B1). Sedangkan terendah pada perlakuan long-day dan temperatur 31°C (A2B2).Kata kunci: reproduksi, photoperiod, temperatur; indek kematangan gonad The research is to investigate the effect of photoperiod and temperature on the gonad development (GSI) of the mud crab. This research was conducted at the marine centre hatchery Jepara from September to December 1999. The method used was completely factorial randomized design. The first factor was photoperiod i.e. short-day and long-day. The second factor was i.e temperetur 29 oC and 31 oC. The result showed that photoperiod and temperatur in combination influenced gonad development of the mud crab. The degree of the gonado somatic index (GSI) was 25,41 (A 1B1); 22,06 (A 1B2); 20,77 (A2B1) and 19.88 (A2B2). The result of regression analysis showed that the highest and the lowest gonado somatic indices occured on the combination between short-day and 29 oC and long-day temperatur 3 1oC respectively. Keywords: reproduction, photoperiod, temperatur; and gonado somatic index (GSI)

Reproduksi Karang Acropora aspera di Pulau Panjang, Jawa Tengah : I. Gametogenesis Munasik Munasik; Wisnu Widyatmoko
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 4 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Studi gametogenesis karang Acropora aspera di dataran Pulau Panjang Jepara, Jawa Tengah (60 34’ 30" LS 1100 37’ 45" BT) telah dilakukan pada 3 Oktober 2001 hingga 28 April 2002 melalui pengamatan preparatjaringan karang. Karang A. aspera termasuk kelompok hermaphrodhite, memiliki ovarium dan testis dalam satu polip. Oogenesis berlangsung lebih dari satu siklus dalam setahun. Oosit dengan kematangan bervariasi ditemukan pada bulan Oktober 2001, serta dari Januari 2002 hingga April 2002. Sebaliknya pada Nopember- Desember 2001 dan Mei 2002 tidak ditemukan oosit dalam polip karang. Spermatogenesis berlangsung Januari-April 2002 dan lebih lama dibanding oogenesis, spermatozoa yang siap untuk dilepaskan ditemukan pada April 2002. Diperkirakan pemijahan (spawning) terjadi dua kali dalam setahun yaitu di bulan April dan Oktober.Kata kunci: reproduksi karang, gametogenesis, Acropora aspera, P. Panjang, Jawa TengahGametogenesis of scleractinian coral Acropora aspera at reef flat of Panjang Island, Central Java –Java Sea (60 34’ 30" S 1100 37’ 45" E) was studied by histological observations. Coral A. aspera is a hermaphrodite,with ovaries and testes developing on separate pairs mesenteries. Their oocytes were visible in October 2001 and January-April 2002 through histological sections, while spermatogenesis occurred from Januaryto April 2002. During this observation period, spermatozoa first appeared in March 2002 and then increased until April 2002, while both mature and immature oocytes first appeared in January and were continually produced until April 2002. It suggests that spawning of the coral may occur twice i.e. on April and October.Key words: coral reproduction, gametogenesis, Acropora aspera, Panjang Island, Central Java

Measurement of Acoustic Reflection of Tuna Fish Using Echosounder Instrument Henry M. Manik
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 2 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Indonesia merupakan salah satu negara yang memiliki potensi perikanan tuna yang besar. Pendugaan populasi ikan tuna selama ini menggunakan statistik perikanan. Pendekatan statistik memiliki keterbatasan antara lain membutuhkan waktu yang lama, akurasi yang diragukan dan luas cakupan perairan yang sempit. Untuk itu perlu diupayakan metode baru yang memberikan informasi yang akurat, komprehensif, mutakhir dan berkelanjutan tentang ikan tuna. Salah satu metode mutakhir yang dapat mengetahui kondisi ikan tuna adalah metode akustik. Penerapan teknologi akustik memiliki kelebihan antara lain mudah dalam pengoperasian instrumen, akurasi dan presisi yang tinggi, dapat melakukan pemantauan dan kuantifikasi stok ikan secara kontinu, in situ dan real time dalam pemrosesan serta analisis data. Untuk aplikasi metode akustik tersebut maka penelitian dasar untuk menghitung sifat refleksi akustik atau dikenal dengan Target Strength (TS) dari ikan tuna dilakukan menggunakan echo sounder. Hasil yang diperoleh adalah hubungan nilai TS terhadap panjang ikan dan volume gelembung renang terhadap ikan tuna mata biru (Thunnus obesus) dan tuna sirip kuning (T. albacares). Target Strength (TS) ikan tuna mata biru lebih besar 3 dB dari ikan tuna sirip kuning pada ukuran yang sama. Hasil ini berhubungan dengan perbedaan volume gelembung renang dari kedua spesies tersebut. Hubungan antara TS dan volume gelembung renang ikan tuna dibahas dalam hasil penelitian ini. Implikasi hasil riset ini adalah tersedianya data dasar penelitian akustik terhadap ikan tuna di Indonesia.Kata kunci: ikan tuna, target strength (TS), split beam echo sounder Indonesia has a big potency of tuna fisheries. Unfortunately, a quantification method for tuna fish resources is not understood well. Usually, the estimation of tuna fish population using statistic method. This method has a limitation such as time consuming, less accuration and small area covered. For this reason, a novel method was used to give the high accuration, comprehensiveness, modern technology and real time monitoring of tuna fisheries. One of the modern method to detect and quantify tuna is underwater acoustics. The application of acoustic method has many advantages such as easy to operate the instrument, high accuration and precision, continuously monitoring and quantification, real time data processing and analysis. For this purpose, a research programme was carried out in order to study the acoustic wave reflection or target strength (TS) of tuna fish using an echo sounder (QES). The relationships between TS to fork length (FL) and swimbladder volume, for bigeye tuna (Thunnus obesus) and yellowfin tuna (T. albacares) are investigated. The TS of bigeye tuna was about 3 dB higher than yellowfin tuna when comparing species at the same size. The result can be correlated to the swimbladder volume difference between species. The relationship between TS and swimbladder volume was quantified for both species. The implication of this research is the avalaibility of tuna fish database using underwater acoustic technique. Key words : tuna fish, target strength, split beam echo sounder

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