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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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Spatial Distribution of Dissolved Heavy Metals (Hg, Cd, Cu, Pb, Zn) on the Surface Waters of Pare Bay, South Sulawesi Ulung Jantama Wisha; Aida Heriati; Muhammad Ramdhan; Eva Mustikasari; Herdiana Mutmainah; Ilham Ilham
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 4 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Pare bay is one of the areas of significance which is utilized for port services, stevedoring, oil distribution, regional industrial development, aquaculture, cultivation and settlement systems. Pare Bay potentially has a good prospect for a gigantic development. Whilst, a very dangerous threat is pollution, especially heavy metal pollution and water quality degradation. This study aims to determine the current condition of heavy metal concentrations and its distribution on surface waters of Pare Bay. Heavy metals were analyzed using AAS (Atomic Absorption Spectrophotometry) in which it has a minimum detection limit reached 0.001 ppm so that the heavy metal concentration can be well-determined. Hg concentration is higher in the surface ranged 0.01-0.1 mg.l-1. Cd concentration ranged from 0.018-0.083 mg.l-1. Cu concentration ranged from 0.043-0.078 mg.l-1. Pb concentration ranged from 0.111-2.692 mg.l-1. Zn concentration ranged from 0.004 - 0.112 mg.l-1. Heavy metals content in Pare Bay exceeds the standard quality established by Ministry of Environment. It potentially harms the marine life which indirectly reduces the function value of Pare Bay as a center of maritime in the South Sulawesi. Water quality condition play a role in inducing the toxicity level of heavy metals in the Pare Bay. So that this area need to be monitored the water quality sustainably.

Dampak Pencemaran Terhadap Kualitas Perairan dan Strategi Adaptasi Organisme Makrobenthos di Perairan Pulau Tirangcawang Semarang M. Yusuf; Gentur Handooyo
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 1 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Perairan pulau Tirangcawang secara nyata menerima buangan limbah yang berasal dari sejumlah pabrik yang berada di hulu sungai Karanganyar dan Tapak. Limbah ini mengakibatkan terjadinya pencemaran yang dampaknya menurunkan kualitas air dan membahayakan bagi kehidupan organisme perairan khususnya hewanmakrobenthos. Tujuan penelitian adalah untuk mengetahui dan mengkaji: (1) kualitas lingkungan perairan, (2) struktur komunitas hewan makrobenthos, dan (3) strategi adaptasi hewan makrobenthos terhadap lingkungan perairan yang telah tercemar. Metode penelitian yang digunakan yaitu studi kasus. Pengambilan sampel dilakukan sebanyak tiga kali ulangan, dengan interval 14-15 hari. Analisis data yang digunakan untuk mengetahui kualitas perairan menggunakan Baku Mutu Air Laut. Analisis untuk mengetahui struktur komunitas hewan benthos yaitu menghitung kelimpahan individu jenis, nilai indeks eanekaragaman jenis (H’) dan keseragaman jenis (E). Sedangkan untuk mengetuhui strategi adaptasi menggunakan metode Grafik Frontier. Berdasarkan hasil pengukuran parameter fisika-kimia air menunjukkan bahwa beberapa parameter seperti COD, N-NO2, dan logam berat Cu, Cd, Pb, Ni ternyata nilainya telah melebihi batas yang diinginkan dalam Baku Mutu Air Laut. Berdasarkan hasil perhitungan Nilai indeks H’ dan E hewan makrobenthos, yaitu berkisar dari rendah sampai dengan sedang. Berdasarkan nilai ini, jika dikaitkan dengan tingkat pencemaran, maka dikatakan bahwa kualitas perairan di daerah penelitian telah tercemar kategori ringan sampai dengan sedang. Pola strategi adaptasi organisme makrobenthos terbagi dua, yaitu: (1) mengarah ke stadia III (kondisi ekosistemmasih baik atau stabil), tedapat pada stasiun I, II, III, dan IV; dan (2) mengarah ke stadia I (kondisi ekosistem labil) terdapat di stasiun V, VI, VII.Kata kunci : pencemaran perairan, strategi adaptasi, makrozoobenthosTirangcawang island waters received waste from factories lie along the rivers. The waste gave pollution which cause the quality of water decrease, so it will bring sea organisms in dangerous condition especiallymacrozoobenthos. The aim of this research is to investigate the quality of water environment and the community structure of makrozoobenthos as well as macrozoobenthos adaptation strategy in relation with polluting material. The research method is case study. The sample were taken three times with 14-15 days. Interval analysis data to on the waters quality by comparing to Sea Water Quality Standard. The result of water physical and chemical parameters measurement showed that COD, N-NO2 and heavy metals Cu, Cd, Pb, Ni valued appearred higher that those stated in Sea Water Quality Standard. The diversity indeces value of macrozoobenthos showed between low to medium level; so based that the waters quality in this location were polluted in the low up to the medium category. Design of adaptation strategy for the macrobenthic organism had two type i.e. stadia III or stabil and good ecosystem condition at station I, II, III, IV; and stadia I or not good and labil ecosystem condition at on V, VI,VII.Key words : waters pollution, adaptation strategy, macrozoobenthos

Pengembangan Co-Management Taman Nasional Karimunjawa Frida Purwanti; Hadi S. Alikodra; Dedy Soedharma
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 13, No 3 (2008): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Co-management adalah suatu pengaturan dimana tanggung jawab pengelolaan sumberdaya dibagi antara pemerintah dan pengguna. Peningkatan pemanfatan sumberdaya Taman Nasional Karimunjawa telah menurunkan kualitas sumberdaya dan jika dibiarkan akan mengancam status TNKJ. Tujuan utama studi adalah merumuskan arahan kebijakan pengembangan co-management Taman Nasional Karimunjawa dengan menganalisa kebijakan dan kelembagaan pengelolaan, mengevaluasi kapasitas pengelolaan dan mengidentifikasi faktor kunci pengembangan co-management. Studi dilakukan dari bulan April 2006 sampai Maret 2007 di Karimunjawa, Jepara menggunakan pendekatan deskriptif anaiitik. Data dianalisa secara kualitatif dengan analisis prospektif. Hasil menunjukkan adanya disharmonisasi peraturan dalam pengelolaan TNKJ dan terbatasnya kapasitas pengelolaan. Untuk itu diperlukan pengelolaan dengan co-management melalui pengaturan koordinasi yaitu pembentukan forum stakeholder dari MOU antara BTNK dan Pemerintah Kabupaten Jepara, pembuatan aturan main dalam pengelolaan dan pemanfaatan sumberdaya TNKJ, dan membuat aksi kegiatan kolaborasistrategis yang komprehensif dengan kerja sinergi stakeholders sesuai kapasitas dan kemampuannya berdasarkan prinsip-prinsip saling menghargai, saling mempercayai, sating bertanggung gugat, sating berbagi tanggung jawab dan berbagi keuntungan.Kata kunci: Co-management, Taman Nasional Karimunjawa.

Exploited but Unevaluated: DNA Barcoding Reveals Skates and Stingrays (Chordata, Chondrichthyes) Species Landed in the Indonesian Fish Market Hawis Madduppa; Rani Utari Ayuningtyas; Beginer Subhan; Dondy Arafat; Prehadi .
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 2 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Reliable and precise species identification is important to fisheries management and conservation. However, many rays and skates in Indonesia are currently being exploited and landed into traditional fish market without a proper identification. Therefore, this study was conducted to identify species of skates and stingrays that were landed and traded in three fish markets in Indonesia (Palabuhanratu, Muara Saban, and Lampung) using molecular techniques and to determine the conservation status of the identified species based on IUCN (International Union for Conservation of Nature and Natural Resources) as well as defined by CITES (Convention on International Trade in Endangered Species). The mitochondrial cytochrome oxidase I (COI) gene was amplified by polymerase chain reaction (PCR) using a pair of primer, fish-BCL and fish-BCH. Of 29 tissue samples collected from the study sites, a total of five species were successfully identified: Dipturus chilensis (4), Himantura walga (1), Neotrygon kuhlii (11), Taeniura lymma (9) and Rhinoptera javanica (4). The Neighbor Joining phylogeny of mitochondrial lineages, based on partial COI gene sequences, the ingroup haplotypes were clustered into five main clades representing each species. The identified stingrays were being listed as vulnerable (D. chilensis and R. javanica), near threatened (H. walga and T. lymma), and data deficient (N. kuhlii) by IUCN, with two species (D. chilensis and H. walga) population were indicated decreased. Unfortunately, all of identified species have not been evaluated by CITES regarding their trade status. As a consequences, a valuable effort should be placed to create a scientific network for monitoring programmes not only on a local scale, and to make pressure on governments for adopting molecular techniques as tools for controlling and avoiding misidentification. Keywords: Mitochondrial DNA, Phylogeny, Coral Triangle, Taxonomy, Fisheries

Studi Tingkah Laku Ikan pada Proses Penangkapan dengan Alat Bantu Cahaya : Suatu Pendekatan Akustik Muhammad Sulaiman; Indra Jaya; Mulyono S Baskoro
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 11, No 1 (2006): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Makalah ini menguraikan tentang hasil penelitian tingkah laku ikan di sekitar daerah pencahayaan selama proses penangkapan melalui pendekatan akustik. Tujuan studi adalah mengidentifikasi pola tingkah laku ikan yang berhubungan dengan operasi penangkapan ikan yang menggunakan cahaya. Secara khusus akan dianalisis pola sebaran ikan sebelum dan setelah proses penangkapan, pola kedatangan ikan dan pola tingkah laku ini di sekitar sumber pencahayaan. Penelitian dilakukan di perairan Kabupaten Barru, Selat Makassar (4° 19’ 19,9" Lintang Selatan – 119° 16’ 201" Bujur Timur) dengan menggunakan instrumen side scan sonar. Analisis deskriptif dilakukan untuk menjelaskan pola tingkah laku ikan pada daerah yang disinari. Hasil penelitian menunjukkan kawanan ikan akan ada yang langsung menuju ke sumber cahaya dan ada yang tidak, dan datang pada berbagai kedalaman tergantung pada kedalaman renangnya masing-masing. Kecepatan gerak kawanan ikan mendekati bagan berkisar 0,57 m/detik dan di sekitar pencahayaan sebesar 0,21 m/detik. Kawanan ikan cenderung bergerak dalam pola yang teratur mengelilingi sumber cahaya, dan akan semakin terkonsentrasi di sekitar daerah tangkapan pada saat lampu yang berada di bawah bingkai bagan dipadamkan. Di dalam daerah pencahayaan, pola distribusi ikan cenderung berbentuk bola (spherical) dan berbentuk pita (ribbon) secara vertikal di luar daerah pencahayaan Kata kunci: pendekatan akustik, tingkah laku ikan This paper describes the results of fish behavior study around illuminated area during capture process through acoustic approach. The objective of this study is to identify the pattern of fish behavior related to the operation of fishing gear using light. This research specifically aims to analyze the pattern of fish distribution before and after the capture process, to analyze the arrival pattern and to analyze fish behavior around the light source. This research was conducted in Barru Regency waters, Makassar Strait (4° 19’ 19,9" S. Lat. – 119° 16’ 201" E. Lon.) using Side Scan Sonar Instrument. Descriptive analysis was employed to examine the behavioral pattern around the given illumination area. The result shows that there are some fish came directly to the light source and stay in the vicinity of the illuminated area while others are outside of that area. The fish school approaching the illuminated area was found at the depth of 5-10 meters and 20-30 meters. The fish school movement speed approaching the Bagan Rambo reached 0.57 m/s and 0.21 m/s when fish school was around the illuminated area. The fish school tends to move in regular pattern encircling the light source and became concentrated once the light is turned off. In the illuminated area the shape of the fish school tend to be spherical, while outside of the area is tend to be in the shape of ribbon. Key words: acoustic approach, fish behaviour

Komunitas Padang Lamun dan Ikan Pantai di Perairan Kendari, Sulawesi Tenggara (Seagrass and Coastal Fish Communities in Kendari Waters, South-East Sulawesi) Susi Rahmawati; Fahmi Fahmi; Deny S Yusup
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 4 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Salah satu peran ekologis padang lamun adalah tempat pemeliharaan ikan yang ditunjang oleh struktur vegetasi lamun. Keberadaan lamun dapat memengaruhi kelimpahan ikan pada suatu perairan dangkal. Penelitian ini bertujuan mengidentifikasi kondisi lamun dan fungsi lamun sebagai area pemeliharaan ikan dalam menunjang kelimpahan ikan. Penelitian dilakukan di Perairan Kendari, Sulawesi Tenggara. Stasiun penelitian ditentukan pada enam lokasi, yaitu tiga lokasi bervegetasi lamun dan tiga lokasi tanpa vegetasi lamun. Parameter penelitian antara lain struktur komunitas lamun dan kelimpahan ikan. Data dianalisis secara statistik dengan one way ANOVA dan korelasi Person program Grahpad Prism 5.0 (Trial session). Penutupan lamun rata-rata berkisar antara 25 - 51% dan kerapatan berkisar 327,78 - 597,22 ind m-2.Struktur komunitas pada ketiga vegetasi lamun tidak berbeda secara signifikan. Ikan tercatat 73 jenis dan 1815 individu, antara lain ikan-ikan yang biasa ditemukan di ekosistem lamun seperti Apogon margaritophorus, Lutjanus gibbus, dan Achreichthys tomantosus. Jenis ikan yang paling melimpah adalah Siganus canaliculatus dengan rata-rata kelimpahan 0,378 ind m-2. Rata-rata kelimpahan ikan lebih besar pada stasiun bervegetasi dibandingkan stasiun yang tidak bervegetasi. Kerapatan lamun memiliki korelasi positif terhadap kelimpahan ikan (p<0,05). Kondisi lamun di Perairan Kendari tergolong cukup baik dan dapat menunjang kekayaan dan kelimpahan ikan pantai.Kata kunci: kerapatan lamun, peran ekologi, pemeliharaan ikan, SulawesiOne of ecological role of seagrass is as nursery area which hold by their own vegetation structure. Seagrass community can influence the abudance of fish in a shallow water. This study aimed to identify the seagrass bed condition as nursery area for supporting fish abudance. The study was conducted in Kendari Waters, South-East Sulawesi. Research station was set in six location .i.e. three location at seagrass vegetated and three location without seagrass. Parameter of the study was community structure of seagrass and abudance of fish. Data were analised statistically using one way ANOVA and Person correlation Grapad Prism 5.0 (Trial session). Mean of seagrass coverage was about 25 to 51% and density 327.78 to 597.22 ind m-2. There were no difference on community structure of seagrass at each location. There were 73 species of fish and 1815 individuals, there were fish that usually find in seagrass ecosystem for example Apogon margaritophorus, Lutjanus gibbus, and Achreichthys tomantosus. The most abundant species was Siganus canaliculatus (Siganidae) with mean abundance 0.378 ind m-2. Mean of fish abundance was higher in vegetated area than unvegetated. Seagrass density positively correlated with fish abundace (p<0.05). Seagrass community in Kendari Water showed a fairly good and good condition to support coastal fishes richness and abundance.Key words: seagrass density, ecologi role, nursery area, fish communities, Sulawesi

Sebaran Sedimen di Perairan Delta Sungai Bodri, Kendal, Jawa Tengah Warsito Atmodjo
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 1 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini dilakukan untuk menganalisis sebaran sedimen, faktor arus serta gelombang yang mempengaruhinya di perairan delta Sungai Bodri. Penelitian ini dilakukan pada bulan Mei sampai Juni 2006. Metode eksploratif digunakan dalam penelitian ini, sampel sedimen diambil dengan stratied purpose sampling berupa sedimen suspensi muara sungai dan sedimen dasar perairan Delta Sungai Bodri. Hasil penelitian menunjukkan bahwa sebaran sedimen delta pada Sungai Bodri adalah gosong pasir (swas bar) dan pola akumulasi gosong pasir sejajar dengan garis pantai. Komposisi sedimen delta berupa lanau pasiran, pasir lanauan, dan pasir. Faktor hidrooseanogra yang mempengarihi sebaran sedimen delta Sungai Bodri yang dominan adalah debit Sungai Bodri 9,17 - 54,48 m3/dt.; input sedimen suspensi 0,26 – 0,42 kg/dt.; MSL pasut 58,65 cm.; LLWL pasut 37 cm.; HHWL 98 cm.; kedalaman perairan (-11) cm sampai (-111) cm.; kecepatan arus (0,16 to 0,68) m/dt.; arah arus Utara (210°-267°) Timur; tinggi gelombang (0,08-1,5) m dan arah gelombang Utara (200°-318°) Timur. Faktor oseanografi yang dominan pembentuk sebaran sedimen delta Sungai Bodri adalah gelombang. Kata Kunci : delta, sedimen, Sungai Bodri The pattern distribution of sediment of River Bodri delta and oceanographic factor influenced them are studied during May until June 2006. Explorative methods was apllied, the sample of sediment i.e. suspended and bottom sediment were taken from river mouth of Bodri. The results showed that the pattern sediment accumulation at delta River Bodri are swas bar and the sediment were spreaded out parallel with the coastal line. Component of sediment delta concist of sandy silt, silty sand and sand. Factor of hidro-oceanography which built distribution pattern of sediment delta of River Bodri as follows : The value of deschart River Bodri is 11,3315 m3/sec.; sediment suspention input 0,0835 kg/sec.; mean sea level of tides 58,65 cm.; height waters of low tides 37 cm.; height water of height tides 98 cm.; depth of subsurface waters (-11) cm to (-111) cm.; velocity of suurents is (0,16 to 0,68) m/ sec.; the trend of currents is North (2100-2670) degree East; height of wave (0,08-1,5) m and bearing of wave North (2000-3180) degree East. The dominant agent of oceanographic factors of pattern sediment accumulation in delta of River Bodri was waves energi. Key Words : delta, sediment, Bodri River

Fate of Heavy Metals Pb and Zn in the West Season at Jeneberang Estuary, Makassar Najamuddin .; Tri Prartono; Harpasis S Sanusi; I. Wayan Nurjaya
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 3 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The pollutant quantity of heavy metals entering water environment does not give complete answer toward the generated effect and risk, however it needs thoroughly study related to the pollutant dynamic. The aim of this research was to investigate the fate of Pb and Zn in water, such as: distribution, behavior, and reactivity (case study: Jeneberang Estuary, Makassar). Pb and Zn concentrations were determined using Atomic Absorption Spectrophotometry (AAS). The distribution of dissolved Pb and Zn showed a pattern that the lowest concentration was in the fresh water (the river zone), whereas the highest concentration was in the salt water (the marine zone). The distribution pattern of particulate Pb and Zn showed that the highest concentration was in the fresh water (the river zone) and the salt water (the marine zone), whereas the lowest concentration was in the estuary zone. The behavior of dissolved Pb and Zn tended to increase the concentration (desorption) along the increased salinity gradient. The residual fraction was the dominant component of geochemical fractions in the sediment that indicated the sources of Pb and Zn mainly derived from a natural process and the reactivity was low in the water. Keywords: distribution, behavior, reactivity, lead, zinc, pollution

Reproduction Pattern and Multispecific Spawning of Acropora spp. in Spermonde Islands Reef, Indonesia (Pola Reproduksi dan Pemijahan Multispecific Acropora Spp. di Kepulauan Spermonde, Indonesia) Syafyudin Yusuf; Jamaluddin Jompa; Neviaty P. Zamani; M. Zairin Junior
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 18, No 3 (2013): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Perairan laut tropis seperti di Indonesia yang memiliki variasi lingkungan yang hampir konstan– diduga periode pemijahan karang melebar sampai beberapa bulan dan pada fase bulan yang berbeda, sehingga sulit menentukan waktu pemijahannya dalam skala bulan, hari dan jam. Penelitian ini akan memberikan informasi pola reproduksi dan sinkronisasi pemijahan beberapa jenis karang Acropora spp di Kepulauan Spermonde, Makassar. Sebanyak tujuh jenis karang Acropora spp. diamati kematangan atau kemunculan gonad dan pemijahannya di alam (in situ) dan atau di laboratorium (ex situ) di Marine Station Universitas Hasanuddin. Pola reproduksi menunjukkan spawning berlangsung setiap musim hujan pada bulan Februari-Maret selama tiga tahun berturut-turut. Pemijahan berlangsung secara sinkron dan broadcasting pada awal bulan purnama (0 BP sampai +2 BP), pada jam 18:10–19:00). Bersamaan dengan itu, kondisi lingkungan pemijahan berlangsung saat puncak pasang tinggi dengan suhu rata-rata harian perairan 30,3ºC dan curah hujan yang masih tinggi di bulan Maret. Informasi ilmiah ini akan bermanfaat untuk mengembangkan riset dan tehnik reproduksi karang di alam dan laboratorium sebagai upaya merestorasi dan merepopulasi jenis karang tertentu. Kata kunci : Acropora spp, reproduksi seksual, Kepulauan Spermonde It has been thought that Indonesian marine tropical waters have less environmental variability, so that spawning period of coral extend for several months and occured during different lunar phases. Therefore the timing of coral spawning in a year cannot be predicted especially for monthly, daily and hourly scales. This study was aimed to investigate the reproductive pattern, and the environmental cues of Acropora spp. in Spermonde Islands reefs of Makassar. Spawning corals have been determined the presence of mature gonad and spawning event in their habitats (in situ) and in the laboratory (ex situ) of Marine Station of Barrang Lompo Island, Hasanuddin University. Here we showed that seven species of Acropora spp. spawned in February and March of rainy season for consecutive three years (2010, 2011, 2012). The multispecific broadcasting spawning took place in lunar period (0–2 AFM) at 06:10–07:00 pm). The spawning time occured in high tide and the temperature was 30,3oC. This study will be useful for development of coral reproduction research and technique in both field and laboratory as an effort to restore coral reef and enhance coral population in particular. Keywords: Acropora spp, sexual reproduction, Spermonde Islands

Composition of Skipjack Tuna (Katsuwonus pelamis L) Taken by Commercial Fishery from the Northeastern Waters of Indonesia R. Sala
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 4 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The objectives of this study are to detect the changes in size composition of skipjack tuna, and to examine any association that may exist between skipjack tuna and other tunas taken from the northeastern Indonesian waters. Data were collected through a field survey by taken samples of catch of commercial fisheries in the study areas. Results of the study revealed that size composition of skipjack taken by pole-and-liners tended to be stable over the observation periods and was dominated by size class larger than 2.5 kg. However, there was a tendency of domination of skipjack for size class less than 1 kg, particularly taken by Bitung’s purse-seiners fishing around North Sulawesi water. It was also revealed that skipjack taken by the commercial fishery show a strong association with other tuna, especially yellowfin tuna. Key words : skipjack, size composition, commercial fishery, northeastern waters of Indonesia Penelitian ini bertujuan untuk mengevaluasi perubahan komposisi ukuran cakalang yang tertangkap dan asosiasi yang mungkin ada antara cakalang dan tuna yang lain pada hasil tangkapan di kawasan utara perairan Indonesia bagian timur. Data penelitian ini diperoleh melalui survey lapangan dengan mengambil sampel hasil tangkapan dari perikanan komersial di lokasi penelitian. Dari hasil penelitian ini terungkap bahwa komposisi ukuran cakalang yang tertangkap oleh huhate (pole-and-liner) cenderung stabil dan didominasi oleh ukuran lebih besar dari 2,5 kg. Akan tetapi untuk cakalang yang tertangkap oleh pukat cincin didominasi oleh ukuran yang kurang dari 1 kg, terutama yang tertangkap di perairan sekitar Sulawersi Utara. Hasil penelitian ini juga mendapatkan adanya korelasi yang erat antara ikan cakalang dan tuna ekor kuning yang tertangkap oleh perikanan komersial. Kata kunci : cakalang, komposisi ukuran, perikanan komersial, perairan bagian utara kawasan timur Indonesia.

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