scholarly journals PERIKANAN TUNA SIRIP KUNING (Thunnus albacares Bonnaterre, 1788) PADA ARMADA TONDA DI SAMUDERA HINDIA SELATAN JAWA

2019 ◽  
Vol 11 (3) ◽  
pp. 161
Author(s):  
Maya Agustina ◽  
Bram Setyadji ◽  
Prawira Atmaja Rintar Pandapotan Tampubolon
Keyword(s):  
Indian Ocean ◽  
Size Structure ◽  
Landing Site ◽  
Yellowfin Tuna ◽  
Fishing Gear ◽  
Thunnus Albacares ◽  
Skipjack Tuna ◽  
The Indian Ocean ◽  
Average Size ◽  
Relationship Of

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.

scholarly journals KOMPOSISI HASIL TANGKAPAN DAN DAERAH PENANGKAPAN PANCING ULUR TUNA DI PERAIRAN SENDANG BIRU

2019 ◽  
Vol 25 (4) ◽  
pp. 241
Author(s):  
Maya Agustina ◽  
Irwan Jatmiko ◽  
Ririk Kartika Sulistyaningsih
Keyword(s):  
Indian Ocean ◽  
Landing Site ◽  
Yellowfin Tuna ◽  
Purse Seine ◽  
Fishing Ground ◽  
Fishing Gear ◽  
Tuna Fishing ◽  
The Indian Ocean ◽  
High Seas

Tuna, cakalang dan tongkol (TCT) merupakan jenis hasil tangkapan ikan yang memiliki nilai ekonomis penting dan masih terdapat peluang untuk dimanfaatkan. Salah satu sentra perikanan tuna, cakalang dan tongkol di kawasan Indonesia Barat yang terbesar adalah di Kabupaten Malang tepatnya di Pelabuhan Perikanan Pantai (PPP) Pondokdadap Sendang Biru. Jenis alat penangkapan ikan yang digunakan oleh nelayan untuk menangkap tuna di perairan ini adalah pancing ulur (handline) yang dioperasikan dengan menggunakan bantuan rumpon. Tujuan penelitian ini adalah untuk mengetahui informasi sebaran daerah penangkapan (teritorial, ZEE dan laut lepas) dan bagaimana dinamika hasil tangkapannya khususnya tuna, cakalang dan tongkol. Pancing ulur mendominasi alat penangkapan ikan yang digunakan di PPP Pondokdadap, Sendang Biru tercatat sebanyak 70,42%, sedangkan pukat cincin sebanyak 9,82% dan pancing rawai sebanyak 19,76%. Jenis hasil tangkapan pancing ulur terbanyak adalah cakalang dan juwana tuna. Daerah penangkapan nelayan pancing ulur yang berbasis di PPP Pondokdadap, Sendang Biru menyebar pada kawasan perairan dengan batasan antara 8º – 12º LS dan 108º – 115º BT atau secara geografis berada di dalam perairan teritorial, ZEE dan di laut lepas. Prosentase hasil tangkapan TCT yang tertangkap pancing ulur berdasarkan wilayah perairan seperti berikut: teritorial sebanyak 0,63%, ZEE sebanyak 78,68% dan di luar ZEE (laut lepas) sebanyak 20,69%. Tuna, skipjack and little tuna are economically important and still has the potential to cathed. One of the fisheries centers tuna, skipjack and little tuna landing site in the western part of Indonesia is in Malang located at Pondokdadap Sendang Biru fishing port. The fishing gear commonly used by Sendang Biru fishermen to catch tuna in the Indian Ocean waters is handline which is operated around FADs. The purpose of this study was to find out information the distribution of fishing areas (territorial, EEZ and high seas) and how the dynamics of the catch especially tuna, skipjack and little tuna. The dominant fishing gear in PP Pondokdadap Sendang Biru is the handline with 70.42%, followed by purse seine 9.82% and longlines 19.76%. The dominant catches caught by handline were skipjack and juvenile of yellowfin tuna. Fishing ground of hand line based in PP Pondokdadap located in waters with boundaries between 8º - 12º LS and 108º - 115ºBT or geographically located in the waters territorial, EEZ and on the high seas. Tuna catches precentage caught by handline in territorial, EEZ and high seas, accounting for 0.63%, 78.68% and 20.69%, respectively. 

scholarly journals Genomic analysis reveals multiple mismatches between biological and management units in yellowfin tuna (Thunnus albacares)

2018 ◽  
Vol 75 (6) ◽  
pp. 2145-2152 ◽  
Author(s):  
Rachel B Mullins ◽  
Niall J McKeown ◽  
Warwick H H Sauer ◽  
Paul W Shaw
Keyword(s):  
Indian Ocean ◽  
Genomic Analysis ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Management Units ◽  
Spawning Site ◽  
Asymmetric Dispersal ◽  
Outlier Loci ◽  
The Indian Ocean ◽  
Mixed Stock

Abstract The South African (SAF) yellowfin tuna (Thunnus albacares) fishery represents a potential example of misalignment between management units and biological processes. The SAF fishery spans an operational stock with a boundary at 20°E, either side of which fish are considered part of Atlantic or Indian Ocean regional stocks. However, the actual recruitment of fish from Atlantic and Indian Ocean spawning populations into SAF waters is unknown. To address this knowledge gap, genomic analysis (11 101 SNPs) was performed on samples from Atlantic and Indian Ocean spawning sites, including SAF sites spanning the current stock boundary. Outlier loci conferred high discriminatory power to assignment tests and revealed that all SAF fish were assigned to the Indian Ocean population and that no Atlantic Ocean fish appeared in the SAF samples. Additionally, several Indian Ocean migrants were detected at the Atlantic spawning site demonstrating asymmetric dispersal and the occurrence of a mixed-stock fishery in Atlantic waters. This study highlights both the spatial inaccuracy of current stock designations and a misunderstanding of interactions between the underlying biological units, which must be addressed in light of local and global declines of the species. Specifically, the entire SAF fishery must be managed as part of the Indian Ocean stock.

scholarly journals Hubungan Panjang - Berat, Faktor Kondisi dan Ukuran Pertama Kali Tertangkap Ikan Tuna Sirip Kuning (Thunnus Albacares) di Pelabuhan Perikanan Samudra Cilacap Length - Weight Relationship, Condition Factors and Legth of The First Time Caught of Yellowfin Tuna (Thunnus albacares) in Cilacap Ocean Fishing Port

2020 ◽  
Vol 9 (2) ◽  
pp. 90-96
Author(s):  
Nurul Amin Azizi ◽  
Suradi Wijaya Saputra ◽  
Abdul Ghofar
Keyword(s):  
Sampling Method ◽  
Condition Factor ◽  
Size Structure ◽  
Fork Length ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Weight Relationship ◽  
Measurement Results ◽  
The Indian Ocean ◽  
First Time

ABSTRAK Ikan Tuna Sirip Kuning (Thunnus albacares) yang ditangkap di Samudera Hindia merupakan komoditas penting karena memiliki nilai manfaat dan ekonomis yang tinggi. Berdasarkan hal tersebut, perlu dilakukan penelitian mengenai parameter yang mempengaruhi populasi tuna sirip kuning. Penelitian ini bertujuan untuk mengetahui struktur ukuran, hubungan panjang dan berat, faktor kondisi serta ukuran pertama kali tertangkap. Penelitian ini dilakukan pada bulan Juli-Agustus 2019 di Pelabuhan Perikanan Samudera Cilacap. Jumlah sampel tuna sirip kuning sebanyak 267 ekor dari 27 kapal yang melakukan bongkar di lokasi penelitian. Metode pengambilan sampel adalah dengan mengukur panjang dan berat. Hasil pengukuran yang diperoleh kemudian dilakukan analisis statistik dengan melakukan perhitungan dan hipotesis. Sampel ikan yang digunakan dalam penelitian ini yaitu ikan tuna sirip kuning dengan ukuran >0,5 meter dan berat >15 kilogram. Sampel kapal merupakan kapal tuna longline dengan ukuran >10 GT (Gross Tonage). Hasil penelitian didapatkan ukuran panjang antara 88-174 cmFL (panjang cagak) dan berat antara 17-98 kilogram. Hubungan panjang dan berat bersifat allometrik negatif. Faktor kondisi diperoleh sebesar 0,97-1,25. Ukuran pertama kali tertangkap (Lc) sebesar 140 cmFL. Lc>Lm, menunjukan ikan tuna sirip kuning yang tertangkap sudah pernah memijah dan diperbolehkan ditangkap. ABSTRACT Yellowfin Tuna (Thunnus albacares) caught in the Indian Ocean is an important commodity because it has high economic and benefits. Based on this, research needs to be done on the parameters that affect yellow fin tuna population. This study aims to determine the size structure, length and weight relationship, condition factors and the leght of the first time caught. This research was conducted in July-August 2019 at the Cilacap Ocean Fishing Port. The number of yellowfin tuna samples was 267 from 27 ships unloading at the study site. The sampling method is by measuring length and weight. The measurement results obtained are then carried out statistical analysis by doing calculations and hypotheses. Yellow fin tuna samples>> 0.5 meters in size and> 15 kilograms in weight. The sample ship is a longline tuna ship with size> 10 GT (Gross Tonage). The results showed a length of between 88-174 cmFL (fork length) and a weight of 17-98 kilograms. The length and weight relationship is negative allometric. The condition factor is obtained from 0.97 to 1.25. Length of first catch (Lc) was 140 cmFL. Lc> Lm, indicating that yellowfin tuna caught have spawned and are allowed to be caught. 

scholarly journals Otolith microchemistry: a useful tool for investigating stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean

2019 ◽  
Vol 70 (12) ◽  
pp. 1708 ◽  
Author(s):  
Iraide Artetxe-Arrate ◽  
Igaratza Fraile ◽  
David A. Crook ◽  
Iker Zudaire ◽  
Haritz Arrizabalaga ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Indian Ocean ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Stock Structure ◽  
North West ◽  
Natal Origin ◽  
Oxygen Stable Isotopes ◽  
West Indian Ocean ◽  
The Indian Ocean

A better understanding of the stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean is needed to ensure the sustainable management of the fishery. In this study, carbon and oxygen stable isotopes (δ13C and δ18O) and trace elements (138Ba, 55Mn, 25Mg and 88Sr) were measured in otoliths of young-of-the-year (YOY) and age-1 yellowfin tuna collected from the Mozambique Channel and north-west Indian Ocean regions. Elemental profiles showed variation in Ba, Mg and Mn in YOY otolith composition, but only Mn profiles differed between regions. Differences in YOY near-core chemistry were used for natal-origin investigation. Ba, Mg and Mn were sufficiently different to discriminate individuals from the two regions, in contrast with carbon and oxygen stable isotopes. A linear discriminant analysis resulted in 80% correct classification of yellowfin tuna to their natal origin. Classification success increased to 91% using a random forest algorithm. Finally, a unique larval source was detected among age-1 yellowfin tuna. The signal of these fish resembled that of YOY from a north-west Indian Ocean origin, highlighting the importance of local production. The present study supports the use of otolith chemistry as a promising approach to analyse yellowfin stock structure in the Indian Ocean.

scholarly journals Mercury and cadmium distribution in yellowfin tuna (Thunnus albacares) from two fishing grounds in the Indian Ocean near Sri Lanka

Heliyon ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. e01875 ◽  
Author(s):  
B.K.K.K. Jinadasa ◽  
G.S. Chathurika ◽  
G.D.T.M. Jayasinghe ◽  
C.D. Jayaweera
Keyword(s):  
Sri Lanka ◽  
Indian Ocean ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
The Indian Ocean

scholarly journals Otolith δ18O Composition as a Tracer of Yellowfin Tuna (Thunnus albacares) Origin in the Indian Ocean

Oceans ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 461-476
Author(s):  
Iraide Artetxe-Arrate ◽  
Igaratza Fraile ◽  
Jessica Farley ◽  
Audrey M. Darnaude ◽  
Naomi Clear ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Secondary Ion Mass Spectrometry ◽  
Multinomial Logistic Regression ◽  
Adult Population ◽  
Equatorial Indian Ocean ◽  
Isotopic Signature ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
The Indian Ocean ◽  
A Minor

Yellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ18O values of young-of-the-year fish from known nursery areas of the equatorial Indian Ocean (West, Central and East) were used to establish a reference isotopic signature to predict the origin of sub-adult and adult individuals. Sub-adult tuna otolith δ18O values from Reunion Island were similar to the West nursery signature, but otolith δ18O values of sub-adults from Pakistan were unlike any of the nurseries sampled. Therefore, δ18O values from the Pakistan area samples were considered an additional nursery source for predicting the origin of adult tuna, using a multinomial logistic regression classification method. The western equatorial area was the most productive nursery for three fishing grounds sampled, with a minor contribution of Pakistan-like origin fish. Contribution of Central or East nurseries to the adult population was negligible. One adult otolith was analysed by secondary ion mass spectrometry along the otolith growth transect and results were compared with an isoscape approach to infer lifetime movements. This study is an important first step towards understanding the spatial structure and connectivity of the species.

scholarly journals Stock depletion of yellowfin tuna Thunnus albacares (Bonnaterre 1788) in the Northeastern Indian Ocean

2021 ◽  
Vol 322 ◽  
pp. 05004
Author(s):  
Bram Setyadji ◽  
Hety Hartaty ◽  
Arief Wujdi ◽  
Ririk K. Sulistyaningsih
Keyword(s):  
Indian Ocean ◽  
Data Collection ◽  
Relative Abundance ◽  
Yellowfin Tuna ◽  
Coastal Communities ◽  
Thunnus Albacares ◽  
The Indian Ocean ◽  
Stock Depletion ◽  
Longline Fisheries ◽  
Tuna Longline

The stock of yellowfin tuna (Thunnus albacares) has been in a declining trend in the last five years. Although the noticeable decline mainly occurred in the western part of the Indian Ocean, uncertainty lingers on how this phenomenon will affect the opposite leg. The study aimed to investigate the dynamics of stock through monitoring several indicators by utilizing logbooks, scientific port sampling, and observer data available. The result showed that both relative abundance and estimated catch trend are declining in recent years, a sign that the negative global inclination also influences Indonesian tuna longline fisheries. Further studies are needed to understand whether this phenomenon also impacts other gears. Hence, mitigation on conserving the resource by reducing the catch and strengthening the data collection should be the priority to maintain the livelihood and welfare of many coastal communities.

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