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PERTUMBUHAN DAN MORTALITAS IKAN TUNA MATA BESAR (Thunnus obesus) DI SAMUDERA HINDIA YANG DIDARATKAN DI PELABUHAN BENOA, DENPASAR, BALI Kurniawati, Erika; Ghofar, Abdul; Saputra, Suradi Wijaya; Nugraha, Budi
Management of Aquatic Resources Journal (MAQUARES) VOLUME 5, NOMOR 4, TAHUN 2016
Publisher : Departemen Sumberdaya Akuatik,Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

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Abstract

ABSTRAK Tuna mata besar (Thunnus obesus) di Samudera Hindia menjadi salah satu target utama penangkapan. Berdasarkan pemanfaatan tersebut, perlu dilakukan penelitian mengenai parameter populasi tuna mata besar. Penelitian ini bertujuan untuk mengetahui aspek pertumbuhan, ukuran pertama kali tertangkap, parameter populasi, laju mortalitas, laju eksploitasi dan pola rekrutmen. Jumlah sampel tuna mata besar sebanyak 648 ekor diambil dari 21 armada rawai tuna (longline) yang melakukan bongkar selama penelitian. Data panjang tahun 2013-2014 diperoleh dari Loka Penelitian Perikanan Tuna Bali. Penelitian ini dilakukan bulan April-Mei 2016 di Pelabuhan Benoa, Denpasar, Bali. Analisis data menggunakan Model Von Bertalanffy Growth Function dengan software FISAT II. Hasil penelitian menunjukkan pola pertumbuhan bersifat allometrik negatif. Faktor kondisi diperoleh sebesar 1,02-1,27. Ukuran pertama kali tertangkap (L50%) sebesar 126,54 cmFL. Persamaan pertumbuhan Von Bertalanffy Growth Function (VBGF) diperoleh Lt=199,5(1 - e 0,22 (t+0,451)), dengan nilai K= 0,22/tahun, nilai t0= -0,451 tahun dan L∞ = 199,5 cmFL. Laju mortalitas penangkapan (F) = 0,51/tahun, lebih besar daripada mortalitas alami (M) = 0,40/tahun, berarti kematian tuna mata besar lebih banyak disebabkan karena faktor eksploitasi/penangkapan. Laju eksploitasi (E)= 0,56 mengindikasikan tuna mata besar yang tertangkap oleh armada rawai tuna (longline) di Samudera Hindia dalam kondisi fully exploited (padat tangkap).Kata Kunci : Ikan tuna mata besar; aspek biologi; umur; pertumbuhan; mortalitas; laju eksploitasi; rekrutmen; Samudera Hindia  ABSTRACT Bigeye tuna (Thunnus obesus) in the Indian Ocean became one of the main targets of arrest. Based on utilization, research is needed on bigeye tuna population parameters. This study aims to determine of growth, size at the first caught, population parameters, mortality rate, exploitation rate and recruitment patterns. Number samples of bigeye tuna were taken from 648 fishes by 21 tuna longline fleets which was unloading during this study. Length data of 2013-2014 were obtained from Research Institute for Tuna Fisheries, Bali. This research was conducted April-May 2016 in Benoa Harbour, Denpasar, Bali. Data analysis used the Von Bertalanffy Growth Function Model with FISAT II software. The results showed negative allometric growth patterns. The condition factor was obtained for 1.02 to 1.27. The length at first caught (L50%) amounted to 126.54 cmFL. VBGF growth equation was obtained Lt=199.5(1 - e 0.22 (t + 0.451)), with the value K=0,22/year, t0= -0,451/year and L∞= 199,5 cmFL. The fishing mortality rate (F)= 0.51/year, it was bigger than the natural mortality (M)= 0.40/year, means that mostly mortality of bigeye tuna was caused by the exploitation / fishing factor. The exploitation rate (E)= 0.56, indicated that bigeye tuna were caught by tuna longline fleets in the Indian Ocean on fully exploited.Keywords:Bigeye tuna; biology aspect; age; growth; mortality; exploitation rate; recruitment; Indian Ocean
KOMPOSISI HASIL TANGKAPAN SAMPINGAN DAN IKAN TARGET PERIKANAN RAWAI TUNA BAGIAN TIMUR SAMUDERA HINDIA (Catch Composition of By-Catch and Target Species on Tuna Longline Fisheries in Eastern Indian Ocean) Novianto, Dian; Nugraha, Budi
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 5 No. 2 (2014): Marine Fisheries - November 2014
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.368 KB) | DOI: 10.29244/jmf.5.2.119-127

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ABSTRACTTuna longline operations also capture other than tuna species are known as by-catch are caught accidentally due to the ecological linkages. This study aims to identify the species composition of by-catch and try to analyzed the interaction of non-target species with tuna species as the target species on tuna longline fishery in the eastern Indian Ocean. Surveillance was conducted on February 2013-January 2014 by following 7 commercial tuna longliners vessel with fishing operations for 226 days. The results showed there were 36 species, where the target species consists of 4 tuna species (26.11%) and 32 by-catch species consist of by-product (24.08%) and that is not utilized (discards, 49.74%). The Results of by-catch are consists of a lancetfish (Alepisaurus spp., 42.87%), pelagic stingray (Pteroplatytrygon violacea, 22.05%), escolar (Lepidocybium flavobrunneum, 10.22%) and sickle pomfret (Taractichthys steindachneri, 8.21%), while for other species consists of are billfishes (6 species), shark and rays species (10 species), bony fishes (11 species) and turtles (olive ridley).Keywords: by-catch, tuna longline, Indian ocean-------ABSTRAKPengoperasian rawai tuna juga menangkap jenis-jenis lain selain tuna yang dikenal dengan sebutan hasil tangkap sampingan (HTS atau by-catch) yang tertangkap secara tidak sengaja dikarenakan adanya keterkaitan secara ekologi. Penelitian ini bertujuan untuk mengidentifikasi komposisi jenis hasil tangkap sampingan dan mencoba menganalisis hubungan interaksi ikan hasil tangkap sampingan dengan ikan tuna sebagai tangkapan utama (target species) pada perikanan rawai tuna di bagian timur Samudera Hindia. Pengamatan dilakukan pada bulan Februari 2013-Januari 2014 dengan mengikuti kegiatan operasi penangkapan 7 kapal rawai tuna komersial dengan selama 226 hari operasi penangkapan. Hasil penelitian menunjukkanterdapat 35 jenis ikan dan 1 jenis penyu dimana target utama terdiri dari 4 jenis ikan (26,11%) dan hasil tangkapan sampingan 31 jenis ikan dan 1 jenis penyu dimana yang dimanfaatkan (by-product) (24,08%) dan yang tidak dimanfaatkan (discards) (49,74%). Hasil tangkapan sampingan berturut-turut didominasi oleh ikan naga (Alepisaurus spp., 42,87%), pari lemer (Pteroplatytrygon violacea, 22,05%), ikan setan (Lepidocybium flavobrunneum, 10,22%) dan bawal sabit (Taractichthys steindachneri, 8,21%), selanjutnya juga tertangkap jenis paruh panjang (billfish, 6 spesies), jenis cucut dan pari (elasmobranchii, 10 spesies), jenis teleostei (bony fishes,11 spesies) dan penyu lekang (Lepidochelys olivacea).Kata kunci: Hasil tangkap sampingan, rawai tuna, Samudera Hindia
ANALYSIS OF SEX-RATIO BY LENGTH CLASS OF BIGEYE TUNA (Thunnus obesus) IN THE INDIAN OCEAN Setyadji, Bram; Bahtiar, Andi; Nugraha, Budi
Widyariset Vol 15, No 3 (2012): Widyariset
Publisher : LIPI-Press

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Abstract

By far the information about Indian Ocean big eye tuna biology and fisheries especially in Indonesia is still verylimited. This paper is an attempt to give some information of the biological observations, especially sex ratio of bigeye tuna(BET) in Indian Ocean. Surveillance was conducted by scientific observers on March–April, 2010 following twocommercial tuna longline vessels based in Port of Benoa. Total 159 of BET managed to be hauled and observed.The result showed that sex ratio of male and female BET was 1:1.12 and study indicated small size (60–100cm) and large size (140–160 cm) of BET comprise of male more than female; while middle size (100–140 cm)dominated by female rather than male. In addition most BET caught were already reached their sexual maturity.
PERIKANAN PUKAT CINCIN TUNA SKALA KECILYANG BERBASIS DI PELABUHAN PERIKANAN PANTAI (PPP) TAMPERAN (Small Scale Tuna Purseseine Fisheries Based in Tamperan Fishing Port) Hartaty, Hety; Nugraha, Budi; Styadji, Bram
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 3 No. 2 (2012): Marine Fisheries - November 2012
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.128 KB) | DOI: 10.29244/jmf.3.2.161-167

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ABSTRACTIn general, fisheries in Indonesia is still dominated by small-scale fisheries, one of themis the purse seine fishery based in Tamperan Fishing Port. This study aims to determine aspects of purse seine fishery based on Tamperan Fishing Port such as vessel size and fishing gear, FADs , fishing ground and catches. The study was conducted in 2012 in Tamperan Fishing Port with measurement methods and direct observation and interviews with owners, skippers and crew. The results showed that the vessel of small-scale tuna purse seine fishing based in Tamperan Fishing Port have tonnage between 28-45 GT and made of wood with length 17.21-28 m, width 6-7 m, and depth 2-3 m. Nets is used have length between 250-300 m and width 8-10 m. Fishing ground is FADs at coordinates 10º-12º S and 100º-110º E, 60-100 miles from the Pacitan Bay with distance to the location of FADs about one day. The catch is dominated by skipjack about 57.27%, followed by scad26.31% and juvenile yellowfin 10.05%.Keywords: Purse seine, small scale tuna fisheries, Tamperan-------ABSTRAKSecara umum, perikanan tangkap di Indonesia masih didominasi oleh usaha perikanan skala kecil, salah satunya adalah nelayan pukat cincin yang berbasis di PPP Tamperan. Penelitian ini bertujuan untuk mengetahui aspek penangkapan perikanan pukat cincin yang berbasis di PPP Tamperan berupa ukuran kapal dan alat tangkap, rumpon, daerah penangkapan dan hasil tangkapan. Penelitian dilakukan pada tahun 2011 di PPP Tamperan Pacitan dengan metode pengukuran dan pengamatan langsung di lapangan serta wawancara dengan nelayan pemilik, nakhoda dan awak kapal. Hasil penelitian menunjukkan bahwa armada pukat cincin perikanan tuna skala kecil yang berbasis di PPP Tamperan memiliki ukuran tonase antara 28-45 GT dan terbuat dari kayu dengan ukuran panjang antara 17,21-28 m, lebar 6-7 m, dan dalam 2-3 m. Jaring yang digunakan memiliki panjang antara 250-300 m dan lebar 8-10 m dengan menggunakan rumpon. Daerah penangkapan berada pada koordinat 10º-12º LS dan 100º-110º BT dan berjarak sekitar 60-100 mil dari Teluk Pacitan dengan lama perjalanan menuju lokasi rumpon sekitar 1 hari. Hasil tangkapan didominasi oleh cakalang sebesar 57,27%, diikuti oleh layang 26,31% dan yuwana madidihang 10,05%.Kata kunci: Pukat cincin, perikanan tuna skala kecil, Tamperan
Aspek biologi dan dinamika populasi ikan tenggiri (Scomberomorus commerson Lacepede 1800) di Perairan Arafura Pane, Andina Ramadhan Putri; Mardlijah, Siti; Nugraha, Budi; Suman, Ali
DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Vol 9, No 1 (2020): April 2020
Publisher : Faculty of Marine and Fisheries, Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (847.203 KB) | DOI: 10.13170/depik.9.1.15797

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Abstract. The Arafura waters are rich in fishery resources such as shrimp, demersal fish, pelagic fish, and crustaceans. The Tenggiri fish (Scomberomorus commerson) is the mainstay of pelagic fisheries and is dominant landed in 2 (two) locations in Poumako (Mimika) and Dobo (Aru Islands). The number of samples measured during the study was 2,645 species derived from the waters of Arafura. The production of fisheries increased to be an indication that it is necessary to manage the intensive utilization of fish resources to keep the population. Management requires basic scientific study of biological aspects and population dynamics of Narrow-bareed mackerel. The study was conducted from March to December 2017 in Poumako and Dobo. The 35-130 cmFL fish size structure is dominant at a size of 95 cmFL with negative allometric growth. The length at the first catch is 78 cmFL with a growth rate of (K) = 0.86 per year and an infinitive length (L∞) = 136.5 cmFL. Fish were first to catch at the age of 10 months, and the age reached infinitive (L∞) is 9.5 years old. The recruitment of the fish from August (11.82%) up to October (18.13%) with a peak of September at 23.75%. The fishing mortality (F) is higher than that of natural mortality (M) so that the exploitation rate (F) = 0.67, which indicates that overfishing has occurred in this area. One form of fisheries management that can be done is to limit the fishing season to provide the opportunity of fish to reproduce and recruitment to restore the population.Keywords: Biological aspects, dynamic population, Scomberomorus commerson, Arafura, Poumako, Dobo Abstrak. Perairan Arafura kaya akan sumberdaya perikanan baik udang, ikan demersal, ikan pelagis dan krustasea. Ikan tenggiri (Scomberomorus commerson) menjadi andalan perikanan pelagis dari perairan ini dan dominan didaratkan pada dua lokasi yaitu di Poumako (Mimika) dan Dobo (Kepulauan Aru). Jumlah sampel yang diukur selama penelitian adalah 2.645 ekor ikan tenggiri. Adapun tujuan dari kajian ini untuk perencanaan pengelolaan terhadap pemanfaatan ikan tenggiri yang semakin pasif dieksploitasi sehingga populasinya tetap terjaga. Oleh karena itu pengelolaan ini memerlukan dasar kajian ilmiah berupa aspek biologi dan dinamika populasi ikan tersebut. Penelitian ini dilakukan dari Maret hingga Desember 2017 di Poumako dan Dobo. Hasil analisis distribusi panjang ikan menunjukkan nilai antara 35-130 cmFL, dimana dominan yang tertangkap pada ukuran 95 cmFL dengan pola pertumbuhan allometrik negatif. Ukuran pertama kali ikan tertangkap adalah 78 cmFL dengan laju pertumbuhan (K) = 0,86 per tahun dan panjang infinitif (L∞) = 136,5 cmFL. Ikan pertama kali tertangkap diestimasikan pada usia 10 bulan dan umur saat mencapai panjang infinitif (L∞) adalah 9,5 tahun. Rekruitmen ikan ini diestimasikan berlangsung pada Agustus (11,82%) hingga Oktober (18,13%) dengan puncak rekruitmen terjadi pada bulan September sebesar 23,75%. Nilai kematian akibat penangkapan (F) lebih tinggi dibandingkan dengan kematian alamiah (M) sehingga tingkat pemanfaatannya (F) = 0,67 yang artinya ikan sudah mengalami overfishing. Salah satu bentuk pengelolaan perikanan ikan tenggiri yang dapat dilakukan adalah dengan membatasi musim penangkapan agar memberikan kesempatan ikan melakukan reproduksi dan rekruitmen di perairan sehingga dapat memulihkan populasi.Kata kunci: Aspek biologi, dinamika populasi, Scomberomorus commerson, Arafura, Poumako, Dobo
Penanganan penyu yang tertangkap rawai tuna di Samudera Hindia Nugraha, Budi; Jatmiko, Irwan; Hartaty, Hety
DEPIK Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Vol 6, No 1 (2017): April 2017
Publisher : Faculty of Marine and Fisheries, Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (657.657 KB) | DOI: 10.13170/depik.6.1.5887

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Turtle is one of the vulnerable of megafauna and as a by-catch in tuna longline fisheries, however, management practices have not been done yet. This paper described the efforts to avoid the capture of turtles on the tuna longline fishery and its handling recommendation. It has been written based on the research results and observer programs of activities that have been implemented since 2005. It’s also including a literature review rules and regulations regarding the management of sea turtles. The record results during 2005 - 2014 conducted by an independent scientific board on tuna longline in the Indian Ocean with 72 times number of setting and 89,441number of hooks. There are 105 turtles caught, which are leatherback, olive ridley turtles, hawksbill, loggerhead sea turtles as well as the unknown green turtle where the current status of turtles in the Indian Ocean is in a state of vulnerable, endangered, critically even endangered. The olive ridley turtle, loggerhead and leatherback turtles are in a vulnerable status. While, the green turtles are in a state endangered and even hawksbill in a state extremely endangered. Policy measures for handling of turtles in tuna longline fishery needs to be taken in order to be implemented include the socialization of the use of intensified circle hooks and if necessary the government issued regulations regarding the use of circle hooks, the implementation of the placement of fishing monitoring (observer) aboard the tuna longline in order to assist the skippers monitoring the catch of turtles and turtle handling training for the skippers and crew in order to hold the caught turtles can be handled directly on the boat to reduce the mortality turtles which can be released back into the sea alive.Penyu merupakan salah satu biota yang rawan punah dan sebagai hasil tangkapan sampingan pada perikanan rawai tuna dimana pengelolaannya belum banyak dilakukan. Makalah ini membahas tentang upaya bagaimana menghindari tertangkapnya penyu dan rekomendasi penanganan penyu pada perikanan rawai tuna. Tulisan disusun berdasarkan penelusuran hasil penelitian maupun kegiatan program observer yang telah dilaksanakan sejak tahun 2005, dilengkapi kajian pustaka serta peraturan terkait pengelolaan penyu. Hasil pencatatan selama periode 2005 – 2014 yang dilakukan oleh pemantau ilmiah di kapal rawai tuna di Samudera Hindia dengan jumlah setting sebanyak 72 kali dan 89.441 buah pancing tertangkap 105 ekor penyu, yang terdiri dari penyu belimbing, penyu lekang, penyu sisik, penyu tempayan dan penyu hijau serta penyu yang tidak diketahui jenisnya dimana saat ini status penyu di Samudera Hindia berada dalam kondisi rentan, terancam punah bahkan sangat terancam punah. Penyu lekang, penyu tempayan dan penyu belimbing berada dalam status rentan. Sementara penyu hijau berada dalam keadaan terancam punah dan bahkan penyu sisik berada dalam keadaan sangat terancam punah. Langkah-langkah kebijakan penanganan penyu pada perikanan rawai tuna yang perlu dilaksanakan adalah mengintensifkan penggunaan pancing lingkar, perlu regulasi penggunaan pancing lingkar, implementasi penempatan pemantau penangkapan ikan (observer) di atas kapal rawai tuna agar dapat membantu para nahkoda memonitoring hasil tangkapan penyu dan pelatihan penanganan penyu bagi para nahkoda maupun anak buah kapal yang bertujuan agar penyu-penyu yang tertangkap dapat ditangani secara langsung di atas kapal sehingga menurunkan tingkat kematian penyu-penyu tersebut kemudian dapat dilepas kembali ke laut dalam kondisi hidup.
ANALISIS DEGRADASI LINGKUNGAN PERAIRAN DAN KETERKAITANNYA DENGAN KEMATIAN MASSAL IKAN BUDIDAYA DI WADUK CIRATA, JAWA BARAT Nastiti, Adriani Sri; Hartati, Sri Turni; Nugraha, Budi
BAWAL Widya Riset Perikanan Tangkap Vol 10, No 2 (2018): (Agustus) 2018
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.093 KB) | DOI: 10.15578/bawal.10.2.2018.83-93

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Waduk Cirata dimanfaatkan untuk budidaya ikan dengan sistem keramba jaring apung, dimana jumlah keramba saat ini sudah melebihi daya dukung yang menyebabkan kelebihan hara (eutrofikasi). Di Waduk Cirata setiap tahun terjadi kematian ikan hasil budidaya. Penelitian ini bertujuan untuk mengidentifikasi masalah kematian masal ikan di Waduk Cirata. Pengumpulan data dilakukan pada saat terjadi kematian massal ikan akhir September 2017, di Zona I (Sangkalin, Cipicung-Bandung Barat), Zona II (Cimanggu-Purwakarta), dan Zona III (Jatinengang, Patokbeusi-Cianjur) menggunakan metode observasi cepat in situ, wawancara dan studi pustaka. Parameter yang diamati meliputi: Suhu air / udara, Kedalaman perairan, Warna air, Kecerahan, Kekeruhan, TDS (0,046-0,172 mg/l), TSS (total suspended solid), DHL (0,1-0,3 mS/cm), Oksigen terlarut, ORP (-49 sampai 244 mv), bebas CO2, Alkalinitas, pH, Nitrat, Nitrit, Amonium, Fosfat, Sulfat, BOT (5,06-17,06 mg/l), dan Kronologi kematian massal ikan. Hasil penelitian menunjukkan bahwa, kadar Oksigen terlarut dibawah 4 mg/l dan ORP nilainya negatif sehingga perairan tidak mampu menguraikan akumulasi limbah sebesar 390.848 ton/tahun. Kondisi tersebut mengindikasikan bahwa perairan mengalami degradasi, Degradasi lingkungan perairan dipicu oleh fenomena umbalan menyebabkan kematian massal budidaya ikan sekitar 65 ton (Zona III), 25 ton (Zona II), dan 20 ton (Zona I).The Cirata reservoir is used for fish culture by floating net cage system that currently has been exceeded to its carrying capacity that caused an over nutrient (eutrophication). Every year, mass mortality event occurred in Cirata Reservoir. This research aims to identify the causal of mass mortality event in the Cirata reservoir. This research conducted at the end of September 2017 in several locations: Zone II (Cimanggu-Purwakarta), Zone I (Sangkalin, Cipicung-West Bandung), and Zone III (Jatinengang, Patokbeusi-Cianjur). A rapid in situ observation, interview and literature review. Parameters that measured include Water/air temperature, Depth, Watercolour, Brightness, Turbidity, TDS (0,046-0,172 mg/l), TSS (total suspended solid), DHL (0,1-0,3 mS/cm), Dissolved Oxygen, ORP ((-49 to 244 mv), CO2, Alkalinity, pH, Nitrate, Nitrite, Ammonium, Phosphate, Sulphate, BOT (5,06-17,06 mg/l), and the chronology of mass mortality. The results showed that the dissolved oxygen was less than 4 mg/l and negative ORP value that indicated incapability of environment to decompose the feed accumulation waste (about 390.848 tons/year). The degradation of waters environment triggered by upwelling phenomenon could cause mass mortality event on fish culture in three zones about 65 tons (Zone III), 25 tons (Zone II) and 20 tons (Zone I), respectively.
CAPAIAN PERKEMBANGAN PROGRAM PEMANTAU PADA PERIKANAN RAWAI TUNA DI INDONESIA (Achievement of the Development of Observer Program on Tuna Longline Fishery in Indonesia) Jatmiko, Irwan; Nugraha, Budi; Satria, Fayakun
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 6 No. 1 (2015): Marine Fisheries - Mei 2015
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.027 KB) | DOI: 10.29244/jmf.6.1.23-31

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ABSTRACTFisheries data is one of the important aspects to understand the basic biology, species distributions and population dynamics of fish stock. One of the efforts to collect data is conducting observer program on tuna longline to improve the understanding of all aspects on fishing operation at the sea. The objectives of this study are to describethe historical development of observers, composition and conservation status of tuna longline vessels catch in Indonesia. Data collection was conducted by observer from August 2005 to November 2013. The method used in this research is descriptive method in which this study aimed to describe the phenomenon that occurs in the tuna longline fishery and catch composition. Tuna longline catches can be categorized into fivegroups, namely, tunas, billfishes, sharks and rays, birds and turtles and other fish. The results showed that the composition of longline tuna catches was dominated by other fish groups with 48.10% followed by tunas 33.85%. Other fish group was dominated by bycatch that have economic value (by product). Data and information gained from observer are very important, so its activity should be perceived as necessity for better fisheries management, rather than as mandatory from Regional Fisheries Management Organization (RFMO) regulations.Keywords: catch composition, fisheries management, observer, tuna longline-------ABSTRAKData perikanan merupakan salah satu aspek penting untuk memahami biologi dasar, distribusi spesies dan dinamika populasi stok ikan. Salah satu upaya untuk memperoleh data secara tepat adalah dengan melaksanakan program pemantau di atas kapal rawai tuna untuk meningkatkan pemahaman tentang semua aspek pada operasi penangkapan di laut. Penelitian ini bertujuan untuk mengetahui sejarah perkembangan pemantau, mengetahui komposisi dan status konservasi hasil tangkapan pada kapal rawai tuna di Indonesia. Pengumpulan data dilakukan mulai bulan Agustus 2005 hingga November 2013 di kapal rawai tuna yang sebagian besar berbasis di Pelabuhan Benoa, Bali. Metode yang digunakan dalam penelitian ini adalah metode deskriptif dimana penelitian ini ditujukan untuk menggambarkan fenomena yang terjadi pada perikanan rawai tuna dan komposisi hasil tangkapan. Hasil tangkapan rawai tuna dapat dikategorikan ke dalam lima kelompok yaitu: tuna, ikan berparuh, hiu dan pari, burung dan penyu serta ikan lainnya. Hasil penelitian menunjukkan bahwa komposisi hasil tangkapan kapal rawai tuna didominasi oleh kelompok ikan lainnya, yaitu sebesar 48,10%, diikuti oleh kelompok tuna 33,85%. Kelompok ikan lainnya ini kebanyakan hasil tangkapan sampingan yang mempunyai nilai ekonomis. Data dan informasi yang diperoleh dari program pemantau ini sangat penting sehingga pelaksanaannya harus dilihat sebagai kebutuhan untuk pengelolaan perikanan yang lebih baik, bukan hanya atas dasar kepatuhan terhadap peraturan dari Regional Fisheries Management Organization (RFMO).Kata kunci: komposisi hasil tangkapan, pengelolaan perikanan, pemantau, rawai tuna
CATCH AND EFFORT INFORMATION FOR ALBACORE TUNA (THUNNUS ALALUNGA) BY INDONESIA’S LONGLINERS OPERATING FROM BENOA Sadiyah, Lilis; Nugraha, Budi; Widodo, Agustinus Anung
Indonesian Fisheries Research Journal Vol 19, No 1 (2013): (June 2013)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3103.094 KB) | DOI: 10.15578/ifrj.19.1.2013.33-38

Abstract

Albacore (Thunnus alalunga - ALB) catch was the second highest tuna landed at Benoa Fishing Port and they are mostly landed as frozen bycatch. This paper attempts to provide information on ALB catch and effort trends by Benoa based longline vessels collected by the Benoa Port-based Catch Monitoring and Scientific Observer Programs. The ALB catch landed at the Benoa Fishing Port in 2010 was estimated by the Research Institute for Tuna Fisheries (RITF) to be about 983.14 tons, whereas based on the Indonesian Tuna Long Line Association (ATLI), ALB catch landed at Benoa Fishing Port in 2010 amounted of 2,715.42 tons. This discrepancy was due to sampling for frozen catch (including ALB) could not be conducted in some companies and also there was one company that sell their catch direct to the collector. The observed longline sets were concentrated within the area between 10° - 20°S and 105° - 120°E. Since 2008, the observed setting positions have never extended to south of 20°S. The higher catch rates of ALB were in area south of 15°S.
GENETIC DIVERSITY OF BIGEYE TUNA (Thunnus obesus) BASED ON rntDNA ANALYSIS WITH THE PCR-RFLP TECHNIQUE Nugraha, Budi; Baskoro, Mulyono Sumitro; Pane, Anwar Bey; Nugroho, Estu
Indonesian Fisheries Research Journal Vol 16, No 1 (2010): (June 2010)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

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Abstract

The genetic diversity study of bigeye tuna in Indonesia from Indian Ocean has never been done. One of the analysis to obtain information on the genetic diversity is by using the PCR-RFLP technique.