Bram Setyadji, Bram
Progam Studi Manajemen Sumberdaya Perairan, Departemen Sumberdaya Akuatik Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Published : 43 Documents
Articles

HASIL TANGKAPAN IKAN MADIDIHANG (Thunnus albacares) DI SAMUDERA HINDIA BERDASARKAN HASIL TANGKAPAN YANG DIDARATKAN DI PELABUHAN BENOA, BALI Anggarini, Krisliyana Mia; Saputra, Suradi Wijaya; Ghofar, Abdul; Setyadji, Bram
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 Produksi ikan Madidihang yang cenderung menurun yang disebabkan oleh penangkapan yang berlebih dikhawatirkan dapat mengganggu kelestarian sumberdaya ikan Madidihang. Oleh sebab itu perlu adanya penelitian tentang hasil tangkapan ikan Madidihang. Hasil yang didapatkan dari penelitian diharapkan dapat memberi gambaran tentang kondisi ikan Madidihang di Samudera Hindia. Penelitian dilakukan pada bulan April-Mei 2016 di Pelabuhan Benoa. Penelitian ini bertujuan untuk mengetahui kondisi ikan madidihang melalui telaah panjang-bobot, faktor kondisi, ukuran pertama kali tertangkap, panjang asimtotik (L∞) ikan Madidihang di Samudera Hindia berdasarkan hasil tangkapan yang didaratkan di Pelabuhan Benoa, Bali. Metode yang digunakan yaitu metode survei. Pengolahan data menggunakan perangkat lunak microsoft excel. Hasil penelitian menunjukkan ukuran ikan Madidihang bulan April-Mei 2016 berkisar 70 – 178 dengan modus 112 cmFL. Persamaan hubungan panjang-bobot didapatkan W = 0,00002*FL2,966 dengan pola pertumbuhan isometrik. Faktor kondisi yang didapatkan antara 1,64 – 2,44, dan ukuran ikan pertama kali tertangkap 133 cmFL. Panjang asimtotik (L∞) = 190,05 cmFL. Berdasarkan ukuran ikan yang tertangkap dimana Lc > ½ L∞ dapat dinyatakan bahwa ukuran yang tertangkap telah layak tangkap. Kata Kunci : Ikan madidihang; hubungan panjang-bobot, faktor kondisi, ukuran pertama kali tertangkap ABSTRACT Yellowfin tuna production tends to decrease due to excess catching that is feared could interfere with the preservation of resources yellowfin tuna. Hence, it is necessary to do this research Catch Product of Yellowfin Tuna. Results obtained from the study are expected to give an idea of yellowfin condition in the Indian Ocean. This research was conducted in April-May 2016 at the Benoa Port. The aimed of this research was to determine condition of yellowfin tuna through the study of the length-weight relationship,condition factor, length at first capture, and asymptotic length (L∞) of yellowfin tuna in the Indian Ocean based on catches landed at the port of Benoa, Bali. This research used survey method. Data processing used the software of Microsoft Excel and FISAT II. The results have shown the size of the yellowfin tuna from April-May 2016 ranging from 70 – 178 with 112 cmFL. The equation of length weights correlation was obtained W = 0.00002*FL2,966 with isometric growth pattern. The condition factor obtained was between 1.64 to 2.44, and the size of the first caught fish is 133 cmFL. Asymptotic length (L∞) = 190.05 cmFL. Based on the size of fish caught where Lc > ½ L∞ can be stated that the size of which was caught had a decent catch.  Keywords: Yellowfin Tuna; length-weight relationship; condition factor, length at first capture
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 TUNA SIRIP KUNING (THUNNUS ALBACARES BONNATERRE, 1788) PADA ARMADA TONDA DI SAMUDERA HINDIA SELATAN JAWA Agustina, Maya; Setyadji, Bram; Tampubolon, Prawira Atmaja Rintar Pandapotan
BAWAL Widya Riset Perikanan Tangkap Vol 11, No 3 (2019): (Desember) 2019
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (214.696 KB) | DOI: 10.15578/bawal.11.3.2019.161-173

Abstract

Tuna sirip kuning (Thunnus albacares) merupakan hasil tangkapan terbanyak dibandingkan dengan jenis tuna lainnya di Indonesia. Ketersediaan stok tuna sirip kuning di Samudra Hindia, pada saat ini, diperkirakan dalam keadaan lebih tangkap. Oleh karena itu, pengelolaan secara tepat dan bertanggungjawab penting dilakukan untuk melindungi spesies tuna, salah satu caranya dengan mengkaji alat tangkap yang digunakan. Tulisan ini bertujuan untuk mengungkapkan produktivitas dan hasil tangkapan armada tonda, serta struktur ukuran dan hubungan panjang bobot ikan tuna sirip kuning yang di daratkan di selatan Jawa. Komposisi tangkapan tertinggi dari armada tonda diseluruh pendaratan ikan tuna di selatan Jawa terdiri atas tuna sirip kuning dan cakalang. Analisis CPUE menunjukkan hasil yang fluktuatif di setiap lokasi pendaratan tuna sirip kuning di Selatan Jawa. Tuna sirip kuning yang tertangkap di selatan Jawa dengan armada tonda sebagian besar adalah ikan yang belum layak tangkap karena berukuran kurang dari 100 cmFL. Struktur ukuran panjang tuna sirip kuning yang tertangkap semakin ke Timur semakin panjang ukurannya. Pola pertumbuhan tuna sirip kuning yang tertangkap di Binuangeun memiliki pola isometrik, PPN Palabuhanratu bersifat allometrik Positif, PPP Sadeng, P2SKP Pacitan, PPN Prigi dan P2SKP Sendang Biru bersifat allometrik negatif. Yellowfin tuna (Thunnus albacares) is the largest catch compared to other tuna species in Indonesia. The availability of yellowfin tuna stock in the Indian Ocean, at present, is estimated to be in overfished condition. Therefore, proper and responsible management is important to protect the species. One of the ways is by studying the used fishing gear. This paper aims at determining vessel?s productivity, as well as composition, size structure and length-weight relationship of yellowfin tuna catches from troll line fleet in the Indian Ocean part of south Java. The highest catch of tuna in all of the troll line landing places was yellowfin tuna, following by skipjack tuna. CPUE analysis showed fluctuating results at each landing site. Yellowfin tuna sizes caught by troll line fleet were mostly less than 100 cmFL and categorized as should not be properly caught. Geographically, getting to the east the average size of the catches tend to be larger. The growth pattern of yellowfin tuna catches landed in Binuangeun was isometric; Palabuhanratu was positive allometric; while those landed in Sadeng, Pacitan, Prigi and Sendang Biru were negative allometric.
Sea-Air Impacts on Fishing Season of Hand Line Skip Jack Tuna Katsuwonus pelamis (Linnaeus, 1758) in Southern Pacitan Waters, East Java-Indonesia Setyadji, Bram; Pranowo, Widodo Setiyo; Amri, Khairul
Journal Omni-Akuatika Vol 14, No 1 (2018): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2018.14.1.207

Abstract

Fishing season is important in term of understanding the catch dynamics however, by far the analysis never considered environmental variables into the calculation. The environmental variables in this case is addressed to sea-air interactions during 2012-2015, i.e. monthly wind, surface wind wave, and precipitation level. This study aimed the alternative, yet breakthrough on using Generalized Linear Model (GLM) to analyse the fishing season of skipjack tuna caught by small-scale hand line fleet. The result showed that GLM can be a good alternative in term of predicting the fishing season of skipjack tuna. It provided a good understanding with the surrounded environmental variables. Skipjack tuna fishing season starts from March, reach its peak in April and October. The low season is Februari, June and September. Local weather (wind speed) and religious affair (FastIed) significantly affected the fishing behavior thus lead to dynamics of CPUE obtained.Keywords: sea-air; fishing season; hand line; skipjack; GLM; small-scale
COMPARISON OF INDONESIAN TUNA LONGLINE FISHING PERFORMANCE WITHIN AND OUTSIDE INDONESIA EXCLUSIVE ECONOMIC ZONE (EEZ) Setyadji, Bram; Jatmiko, Irwan
Indonesian Fisheries Research Journal Vol 23, No 1 (2017): (June, 2017)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.115 KB) | DOI: 10.15578/ifrj.23.1.2017.1-6

Abstract

Indonesian tuna longline fleets have been fishing in the Exclusive Economic Zone (EEZ) and high seas of the Indian Ocean for quite some time. However, effort has never been made to separate catch from the EEZ and the high seas as it important for fisheries management. A total of 2,430 set-by-set longline fishing data had been collected by scientific observers based in the Research Institute of Tuna Fishery in Bali since August 2005 to December 2014 on which present analysis was made. The research aims to compare between trend of tuna catch of the EEZ and of the high seas of Indian Ocean. The results show that the mean hook rate of both catches of big eye tuna (BET) and southern Bluefin tuna (SBT) caught in the high seas was significantly higher than that the EEZ (two sample t-test, p<0.05), while for yellow fin tuna (YFT) it was in the opposite direction (two sample t-test, p<0.05). As for albacore (ALB), the mean hook rate value was statistically similar in both fishing grounds (two sample t-test, p>0.05).
STOMACH CONTENT OF THREE TUNA SPECIES IN THE EASTERN INDIAN OCEAN Setyadji, Bram; Bahtiar, Andi; Novianto, Dian
Indonesian Fisheries Research Journal Vol 18, No 2 (2012): (December 2012)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (348.519 KB) | DOI: 10.15578/ifrj.18.2.2012.57-62

Abstract

Feeding habit of tuna in Indian Ocean has been described around Sri Lanka, Indian Waters, Andaman Sea, western Indian Ocean (Seychelles Islands), western equatorial Indian Ocean whereas the tunas feeding habit study in Eastern Indian Oceanis merely in existence. The purpose of this study is to investigate the stomach content of three tuna species (bigeye tuna, yellowfin tuna, and skipjack tuna), apex predator in the southern part of Eastern Indian Ocean. The study was conducted in March – April, 2010 on the basis of catches of commercial tuna longline vessel based in Port of Benoa. A total of 53 individual fishes were collected, consisting of bigeye tuna (Thunnus obesus), yellowfin tuna (Thunnus albacores), and skipjack tuna (Katsuwonus pelamis). Stomach specimens were collected and analyzed.Analysis was conducted on the basis of index of preponderance method. The diet of the three tuna species showed fishes as the main diet (56–82%), followed by cephalopods (squids) as the complementary diet (0–8%), and crustaceans (shrimps) as the additional diet (2–4%). Fish prey composed of 6 families i.e. Alepisauridae, Bramidae, Carangidae, Clupeidae, Engraulidae, and Scombridae.
THE SEASONAL VARIABILITY OF CPUE AND CATCH-AT-SIZE DISTRIBUTION OF TROLL AND HANDLINE TUNA FISHERIES LANDED IN LABUHAN LOMBOK Setyadji, Bram; Hartaty, Hety; Mardlijah, Siti
Indonesian Fisheries Research Journal Vol 22, No 1 (2016): (June 2016)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (170.212 KB) | DOI: 10.15578/ifrj.22.1.2016.53-60

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Troll and hand line tuna fisheries is one of the major fishing gears landed in Labuhan Lombok coastal fishing port (PPP Labuhan Lombok) west Nusa Tenggara Barat province.  Both fisheries are strongly associated with fish aggregating devices (FAD’s). The main fishing ground is Indian Ocean southern part of this province.  Several source of data has been collected regularly. Data analysis comprised of monthlycatch and effort data samples based onport monitoring program during 2012 to 2015. The result showed the diclining of CPUE of yellow fin and skipjack tuna presumably related to fishing intensity of fleets and its variability that landed in PPP Labuhan Lombok.  The increasing CPUE of skipjack tuna in 2014 was predicted due to increasing aggregation around the FADs. Constrasting seasonal fishing index pattern between yellowfin and skipjack tuna foundin 4-month cycles, started in January.A length-weight relationship suggested that yellowfin tuna caught bysmall-scale fisheries were performing allometric growth pattern (b=2.963, r2=0.9737).
STANDARDIZING CPUE OF ALBACORE TUNA (Thunnus alalunga Bonnaterre, 1788) ON TUNA LONGLINE FISHERY IN EASTERN INDIAN OCEAN Rochman, Fathur; Setyadji, Bram; Wujdi, Arief
Indonesian Fisheries Research Journal Vol 23, No 1 (2017): (June, 2017)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (318.893 KB) | DOI: 10.15578/ifrj.23.1.2017.29-38

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Albacore (Thunnus alalunga) is the third dominant catch of Indonesian tuna longline fishery operating in the eastern Indian Ocean. The percentage production of albacore catch was reaching up 6% of the total catch of tuna groups in Indonesia. Thi study aims to examine a relative abundance indices using standardized catch per unit of effort (CPUE) of longliner based on albacore tuna. This information will give a valuable input and information to support stock assessment particularly in the regional basis. In this study, we use Generalized Linear Model (GLM) with Tweedie distribution to standardize the CPUE and to estimate relative abundance indices based on the Indonesian longline dataset time series. Data were collected from January 2006 to October 2015 (106 trip observer and 8.989 fishing days) by conducting direct onboard observation on tuna longline vessels operating in the Indian Ocean. The result show that year, area,hooks between floats, year*season, year*area and year* hooks between floats significantly influenced the nominal CPUE of albacore. The highest value of Standardized CPUE appeared in 2014 and probably related to the large number of foreign fishing vessels with a high capacity (over 60 GT) targeting frozen tuna including albacore. In 2015, standardized CPUE value was sharply decreased due to the ban of foreign vessels in Indonesia. 
DISTRIBUSI SPASIALDANTEMPORALPLANKTON DI PERAIRANTELUKTOMINI, SULAWESI Setyadji, Bram; Priatna, Asep
BAWAL Widya Riset Perikanan Tangkap Vol 3, No 6 (2011): (Desember 2011)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.608 KB) | DOI: 10.15578/bawal.3.6.2011.387-395

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Planktonmerupakan komponen penting dalamkehidupan akuatik karena fungsi biologisnya yang penting sebagaimata rantai paling dasar dalam rantai makanan dan merupakan organisme yang menduduki kunci utama di dalam ekosistem bahari. Penelitian ini dilakukan pada bulanMei, Juli, dan Nopember 2010 yangmewakili musimperalihan I, musim timur dan musim barat dengan tujuan mengetahui distribusi kelimpahan spasial dan temporal fitoplankton dan zooplankton di Teluk Tomini. Kelimpahan fitoplankton dan zooplankton tertinggi terdapat pada musim barat sebesar 177.666 sel/m3 dan 7.088 ind/m3, sedangkan terendah pada musim timur sebesar 4.878 sel/m3 dan 1.118 ind/ m3. Tingkat indek keaneka-ragaman (H) baik fitoplankton dan zooplankton sedang, indek keseragaman (E) rendah hingga sedang, dan tidak ditemukan jenis tertentu yang dominan. Chaetoceros, Coscinodiscus, dan Rhizosolenia dari kelas Bacillariophyceae merupakan fitoplankton yangmempunyai frekuensi kehadiran yang tinggi, sedangkan Crustaceae merupakan zooplankton yang dominan. Konsentrasi sebaran terdapat dimulut teluk dan tersebar relatif sesuai dengan musim. Plankton plays important role in aquatic life due to its significant biological function as basic food chain in oceanic ecosystem. This studywas conducted on May, July, and November representing north-west monsoon, east monsoon, and west monsoon, respectively. The purposed of this study is to know the spatial and temporal distribution and the abundance of phytoplankton and zooplankton in Tomini Bay. Results showed that the highest abundance of phytoplankton and zooplankton were 177.667 cell/m3 and 7.088 ind/m3 that appeared at north-west monsoon, while the lowest were 4.878 cell/m3 and 1.118 ind/m3 that shown in south-east monsoon. The diversity index (H) for both Phytoplankton and Zooplankton were in medium (1<H<3), while the eveness index (E) range from low (d”1) to medium. There were no dominance species found. However, Chaetoceros, Coscinodiscus and Rhizosolenia that representing Bacillariophyceae showed a high frequency of appearance, while Crustaceae group were the dominance of zooplankton. The distribution of plankton concentrated in the mouth of the bay and relatively distributed according to seasons.
PARAMETER POPULASI IKAN TONGKOL KRAI (Auxis thazard) DI PERAIRAN SIBOLGA DAN SEKITARNYA Hartaty, Hety; Setyadji, Bram
BAWAL Widya Riset Perikanan Tangkap Vol 8, No 3 (2016): (Desember, 2016)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

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Abstract

Tongkol krai (Auxis thazard) merupakan salah satu jenis ikan pelagis dengan nilai ekonomis tinggi di Indonesia, khususnya di perairan Sibolga dan sekitarnya. Eksploitasi terhadap spesies ini terus meningkat sepanjang tahun dan umumnya tertangkap oleh alat tangkap pukat cincin. Tingkat eksploitasi yang intensif terhadap spesies ini tidak disertai dengan studi kajian stok seperti penentuan parameter populasi. Tujuan dari penelitian adalah menentukan beberapa parameter populasi yang dapat dijadikan sebagai bahan pertimbangan pengelolaan perikanan tuna neritik di perairan Sibolga dan sekitarnya. Pengumpukan data yakni data bulanan ukuran panjang dan berat individu ikan dilakukan di PPN Sibolga selama bulan Januari – Desember 2013. Parameter populasi dihasilkan dari analisa berbasis data panjang menggunakan perangkat lunak FAO-ICLARM Stock Assessment Tools II (FiSAT-II). Hasil penelitian menunjukkan panjang ikan tongkol krai yang tertangkap berkisar antara 19 - 45 cmFL atau  panjang rata-rata 32,91 cmFL. Panjang asimtotik (L∞) sebesar 47,9 cmFL dengan koefisien laju pertumbuhan (K) sebesar 0,58 per tahun dan umur pada saat memijah (t0) sebesar -0,246 tahun. Nilai mortalitas alami (M) sebesar 1,08 per tahun, mortalitas akibat penangkapan (F) sebesar 0,63 per tahun dan mortalitas total (Z) 1,71 per tahun. Laju eksploitasi (E) relatif rendah yaitu 0,37 sehingga eksploitasinya berpeluang untuk ditingkatkan sekitar 30% dari tingkat exploitasi aktual tangkapan saat sekarang untuk mencapai pemanfaatan optimum (E = 0,5). Frigate tuna (Auxis thazard) considered as one of the high-valued fish in Indonesian market, especially in Sibolga and its adjacent waters. The exploitation of this commodity is increasing every year and mainly contribued by purse seiners. However, there is lack of proper stock analysis such as determining of biological population parameters. The objective of this study was to obtain several biological population parameters based on length data. Size data was collected by enumerators based at PPN Sibolga from January to December 2013. The results showed that frigate tuna distributed from 19-45 cmFL with an average length of 32.91 cmFL. Asymptotic length (L∞) was estimated about 47.9 cmFL, growth rate (K) was 0.58 year-1 and the age in early condition (to) was -0.246 year. Total mortality (Z) was 1.71 year-1, natural mortality (M) was 1.08 year-1 and fishing mortality (F) was 0.63 year-1. The exploitation rate (E) of frigate tuna considered relativelly low (E=0.37). There is possibility to increase fishing effort about 30% of actual level.