HASIL TANGKAPAN IKAN MADIDIHANG (Thunnus albacares) DI SAMUDERA HINDIA BERDASARKAN HASIL TANGKAPAN YANG DIDARATKAN  DI PELABUHAN BENOA, BALI

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

Download Full-text

Size composition and length-weight relationships of the Yellowfin Tuna (Thunnus albacares) in Bone Bay

E3S Web of Conferences ◽

10.1051/e3sconf/202015301006 ◽

2020 ◽

Vol 153 ◽

pp. 01006

Author(s):

Jalil ◽

Achmar Mallawa ◽

Faisal Amir ◽

Safruddin

Keyword(s):

Growth Pattern ◽

Condition Factor ◽

Average Length ◽

Fork Length ◽

Size Composition ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Weight Measurement ◽

Weight Relationship ◽

The Relationship

The size composition, length-weight relationship, and condition factor of Thunnus albacares were examined in Bone Bay. Sampling was conducted at two stations, i.e., Station I at Cimpu in Luwu Regency and Station II at Lonrae in Bone Regency between July 2018 and June 2019. 10246 and 2651 yellowfin tunas were captured in Station I and Station II, respectively. Measurement of the fork length ranged between 20 cm and 192 cm with an average length of 81,257 ± 33,456 cm in Station I, and between 26 to 162 cm with an average length of 95,479 cm in Station II. The weight measurement ranged between 0,35 and 99,21 kg with an average of 14,539 kg in Station I, and between 0,46 and 97,35 kg with an average of 26,978 kg in Station II. Calculation of the relationship was based on the formula W= 5,5−5FL2,7454 (R2 = 0,963) in Station I, and W=4,1−5FL2,9103 (R2 = 0,761) in Station II. The values of condition factor at Station I and Station II were 2,1395 and 3,4374, respectively. It is quite evident that the growth pattern of the yellowfin tunas at Bone Bay was negatively allometric, indicating that the length increased faster than the weight.

Download Full-text

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

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v9i2.27764 ◽

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.

Download Full-text

Pola pertumbuhan dan faktor kondisi madidihang, Thunnus albacares (Bonnaterre, 1788) di Samudra Hindia Bagian Timur

Jurnal Iktiologi Indonesia ◽

10.32491/jii.v18i1.371 ◽

2018 ◽

Vol 18 (1) ◽

pp. 13

Author(s):

Suciadi Catur Nugroho ◽

Irwan Jatmiko ◽

Arief Wujdi

Keyword(s):

Indian Ocean ◽

Growth Pattern ◽

Condition Factor ◽

Yellowfin Tuna ◽

Growth Patterns ◽

Thunnus Albacares ◽

Relative Condition Factor ◽

Length Increase ◽

Fish Samples ◽

One Year

Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788) is one of the important economically for tuna species that spread in Indonesian waters, including in WPP 572 (Indian Ocean west coast of Sumatra). One important aspect relating to sustainable utilization is the growth pattern and the condition factor. This study aims to examine growth patterns and factor conditions of yellowfin tuna in the Eastern Indian Ocean. The number of fish samples measured in length and weight is 7,550 with length range from 76-176 cm (average: 129.03 cm) and mode at 150 cm. The length weight relationship of the species is W=4x10-5L2.842 (R2 0,957). In general the growth pattern of yellowfin tuna is negative allometric which means that the length increase is faster than the weight. The average relative condition factor of yellowfin tuna is 0.975 with a tendency to decrease along with the increasing of its length. The highest relative condition factor occurred at the length class of 80 cm with 1,061 and the lowest occurred at length 170 cm with 0.918. The monthly relative condition factor generally increased twice in one year from February to June and from July to December. AbstrakTuna madidihang, Thunnus albacares (Bonnaterre,1788), merupakan salah satu spesies tuna ekonomis penting dan ter-sebar di perairan Indonesia, termasuk di WPP 572 (Samudra Hindia bagian barat Sumatera). Salah satu aspek penting yang berkaitan dengan upaya pemanfaatan berkelanjutan adalah pola pertumbuhan dan faktor kondisi. Penelitian ini bertujuan untuk mengkaji pola pertumbuhan dan faktor kondisi ikan madidihang di Samudra Hindia Bagian Timur. Jumlah ikan contoh yang diukur panjang dan bobotnya adalah 7.550 ekor yang mempunyai sebaran panjang 76-176 cm (rata-rata 129,03 cm) dan modus 150 cm. Hubungan panjang bobot ikan tersebut adalah W = 4x10-5L2,842 (R2 0,957). Secara umum pola pertumbuhan madidihang bersifat allometrik negatif yang berarti bahwa pertambahan panjang lebih cepat daripada bobotnya. Faktor kondisi relatif rata-rata madidihang adalah 0,975 dengan kecenderungan menurun seiring bertambahnya ukuran panjang. Faktor kondisi relatif tertinggi terjadi pada kelas panjang 80 cm sebesar 1,061 dan terendah terjadi pada kelas panjang 170 cm sebesar 0,918. Faktor kondisi relatif bulanan secara umum mengalami dua kali peningkatan dalam satu tahun yaitu dari bulan Februari hingga Juni dan dari Bulan Juli hingga Desember.

Download Full-text

Environmental preferences of longlining for yellowfin tuna (Thunnus albacares) in the tropical high seas of the Indian Ocean

Fisheries Oceanography ◽

10.1111/j.1365-2419.2008.00476.x ◽

2008 ◽

Vol 17 (4) ◽

pp. 239-253 ◽

Cited By ~ 21

Author(s):

LI MING SONG ◽

YU ZHANG ◽

LIU XIONG XU ◽

WEN XIN JIANG ◽

JIA QIAO WANG

Keyword(s):

Indian Ocean ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Environmental Preferences ◽

The Indian Ocean ◽

High Seas

Download Full-text

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

ICES Journal of Marine Science ◽

10.1093/icesjms/fsy102 ◽

2018 ◽

Vol 75 (6) ◽

pp. 2145-2152 ◽

Cited By ~ 11

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.

Download Full-text

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

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.11.3.2019.161-173 ◽

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.

Download Full-text

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

Marine and Freshwater Research ◽

10.1071/mf19067 ◽

2019 ◽

Vol 70 (12) ◽

pp. 1708 ◽

Cited By ~ 4

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.

Download Full-text