scholarly journals Modelling several morphometric relationships of swordfish (Xiphias gladius), black marlin (Makaira indica) and blue marlin (Makaira nigricans) caught from Indonesian longliners in the eastern Indian Ocean

2016 ◽  
Vol 4 (2) ◽  
pp. 371 ◽  
Author(s):  
Bram Setyadji ◽  
Irwan Jatmiko ◽  
Arief Wujdi
Keyword(s):  
Indian Ocean ◽  
Growth Pattern ◽  
Fork Length ◽  
Allometric Growth ◽  
Standard Measurement ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
Lower Jaw ◽  
The Indian Ocean ◽  
Xiphias Gladius

This paper presents several equations for converting among measures of size (length and weight) for swordfish (Xiphias gladius), black marlin (Makaira indica) and blue marlin (Makaira nigricans) caught by Indonesian longliners in the Indian Ocean. The equations use for transforming non-standard measurement i.e. eye fork length (EFL) and pectoral fork length (PFL) to standard measurement, lower jaw fork length (LJFL). The paper also discussed about the length-weight relationship, including converting from non-standard length (EFL and PFL) to round weight. The result showed that both PFL and EFL were positively related to LJFL but there were no significant differences existed between females and males among length measures for swordfish, blue marlin, and black marlin (ANCOVA, P>0.05). All regression equation models were considered to be valid (P<0.01) with coefficient of determinations (r2) ranged from 0.81-0.99. Allometric growth pattern was statistically observed for all swordfish (b=2.94, r2=0.94), black marlin (b=3.12; r2=0.90) and blue marlin (b=3.30; r2=0.91).

scholarly journals Estimating blue marlin (Makaira nigricans) sustainable yield in the Indian Ocean using a data-poor approach

2019 ◽  
Vol 4 (3) ◽  
pp. 122-127
Author(s):  
Yuwei Fan ◽  
Zhe Geng ◽  
Jiangfeng Zhu ◽  
Xiaojie Dai ◽  
Kindong Richard
Keyword(s):  
Indian Ocean ◽  
Sustainable Yield ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
The Indian Ocean

Blue marlin (Makaira nigricans) longevity estimates confirmed with bomb radiocarbon dating

2018 ◽  
Vol 75 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Allen H. Andrews ◽  
Robert L. Humphreys ◽  
Jeffery D. Sampaga
Keyword(s):  
Fork Length ◽  
Age Validation ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
Lower Jaw ◽  
Chemical Signatures ◽  
Bomb Radiocarbon ◽  
Dating Method ◽  
The Tropical Pacific ◽  
Age Reading

The longevity of blue marlin (Makaira nigricans) remains unresolved. The use of fin spines and sagittal otoliths for age reading has led to unconfirmed longevity estimates near 20–30 years. Age validation has been elusive because large individuals are uncommonly caught, and a technique that can be applied to structures that provide estimates of age was absent. The use of otolith chemical signatures has been limited by sagittal otoliths that are very small — whole otolith mass of adult blue marlin rarely exceeds 10 mg for the largest fish. Recent advances in the detection limits of radiocarbon (14C) with accelerator mass spectrometry — coupled with recently acquired knowledge of marine bomb 14C signals spanning the tropical Pacific Ocean — have led to an opportunity to age blue marlin from small amounts of otolith material. In this study, otoliths from a recently collected 1245 lb (565 kg) female blue marlin at a measured 146-inch (371 cm) lower jaw fork length were analyzed for 14C. Estimated longevity was either 12–21 or 32–44 years on the basis of bomb 14C dating. Using multiple lines of evidence, it was determined that the young age scenario was most likely, with evidence for an age close to 20 years using a series of deductions in the bomb 14C dating method.

scholarly journals BIOLOGI REPRODUKSI IKAN CAKALANG (Katsuwonus pelamis) DI SAMUDERA HINDIA BAGIAN TIMUR

2015 ◽  
Vol 7 (2) ◽  
pp. 87
Author(s):  
Irwan Jatmiko ◽  
Hety Hartaty ◽  
Andi Bahtiar
Keyword(s):  
Indian Ocean ◽  
Histological Analysis ◽  
Gonadosomatic Index ◽  
Fork Length ◽  
Maturity Stage ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
The Indian Ocean ◽  
The One ◽  
First Maturity

Cakalang (Katsuwonus pelamis) adalah salah satu hasil tangkapan penting bagi nelayan di Samudera Hindia. Penelitian ini bertujuan untuk mengetahui perkembangan gonad dan panjang pertama kalimatang gonad cakalang di Samudera Hindia. Sampel cakalang dikumpulkan dari beberapa tempat di Pantai Selatan Jawa yaitu: Palabuhanratu, Cilacap, Pacitan, Sendang Biru, Kedonganan, Tanjung Luar, Labuhan Lombok dan Oeba dari bulan April 2012 sampai November 2013. Panjang cagak dari 136 sampel berkisar antara 35-68 cm. Tingkat kematangan gonad (TKG) diamati secara histologi dan analisis Gonadosomatic index (GSI). Hasil penelitian ini menunjukkan bahwa TKGcakalang didominasi oleh TKGIV sebesar 43%, diikuti dengan TKG III (21%), TKG I (17%), TKG II (16%) dan TKG V (2%). Panjang pertama kali matang gonad terjadi pada ukuran 42,9 cm. Skipjack tuna (Katsuwonus pelamis) is the one of the important catch for fishermen in the Indian Ocean. The objectives of this research are to investigate gonad maturity and length at first maturity for female cakalang in Indian Ocean. Skipjack tuna were sampled from several places in South Coast of Java i.e.: Palabuhanratu, Cilacap, Pacitan, Sendang Biru, Kedonganan, Tanjung Luar, Labuhan Lombok and Oeba from April 2012 to November 2013. Fork length of the sampled 136 fish ranged from 35 to 68 cm.Maturity stage (TKG) investigate using histological analysis and Gonadosomatic index (GSI) calculation. The results showed that maturity stage of skipjacktuna dominated by TKG IV with 43%, followed by TKG III (21%), TKG I (17%), TKG II (16%) dan TKG V (2%). Length at first maturity occurred at 42.9 cm.

Age determination and growth estimation from otolith micro-increments and fin spine sections of blue marlin (Makaira nigricans) in the western North Pacific

2015 ◽  
Vol 66 (12) ◽  
pp. 1116 ◽  
Author(s):  
Tamaki Shimose ◽  
Kotaro Yokawa ◽  
Katsunori Tachihara
Keyword(s):  
Growth Parameters ◽  
Age Determination ◽  
Fork Length ◽  
Annual Growth ◽  
Growth Band ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
Growth Bands ◽  
Growth Estimation ◽  
Fin Spines

Age determination and growth estimation of blue marlin (Makaira nigricans) were performed by combining method of otolith micro-increment counts of 27 young (17–185-cm lower jaw–fork length, LJFL) and sectioned dorsal fin spines of 571 adult individuals (155–352cm). Otolith micro-increments were counted with ages of 26–338 days old. The estimated mean length (185cm) at Year 1 and growth rate were used to predict the position of the first annual growth band in sectioned fin spines. Distinct growth bands were formed in fin spines annually between September and October. Indistinct growth bands were considered false-annual growth bands. The observed and back-calculated LJFLs at each age were highly variable for both sexes. Von Bertalanffy growth parameters were estimated using mean back-calculated LJFL data as: L∞=295cm, k=0.23, t0=–3.31 years for females and 212cm, 0.29, –4.49 years for males. Females grew to >200cm in 2 years and to >250cm in 5 years on average, whereas the growth of males slowed appreciably after they reached the age of 1 year. This is the first study of blue marlin growth for entire life stages.

scholarly journals Oil gland and oil pores in billfishes: in search of a function

2020 ◽  
Vol 223 (19) ◽  
pp. jeb224956
Author(s):  
F. Dhellemmes ◽  
M. J. Hansen ◽  
S. D. Bouet ◽  
J. J. Videler ◽  
P. Domenici ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Tissue Damage ◽  
Functional Significance ◽  
Skin Surface ◽  
High Density ◽  
Morphological Data ◽  
Istiophorus Platypterus ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
Xiphias Gladius

ABSTRACTBillfishes are well known for their distinctive elongated rostra, i.e. bills. The functional significance of billfish rostra has been frequently discussed and the recent discovery of an oil gland (glandula oleofera) at the base of the rostrum in swordfish, Xiphias gladius, has added an interesting facet to this discussion regarding the potential co-evolution of gland and rostra. Here, we investigated the oil gland and oil pores (through which the oil is brought to the skin surface) of four billfish species – swordfish, Atlantic blue marlin (Makaira nigricans), Indo-Pacific sailfish (Istiophorus platypterus) and striped marlin (Kajikia audax) – and provide detailed evidence for the presence of an oil gland in the last three. All four species had a high density of oil pores on the forehead which is consistent with the hypothesis of hydrodynamic benefits of the oil. The extension of the pores onto the front half of the rostrum in sailfish and striped marlin, but not in swordfish or blue marlin, suggests that the oil may have additional functions. One such function could be linked to the antibacterial and anti-inflammatory properties of the oil. However, the available evidence on predatory rostrum use (and hence the likelihood of tissue damage) is only partly consistent with the extension of pores on rostra across species. We conclude that the oil gland probably serves multiple, non-mutually exclusive functions. More detailed information on rostrum use in blue marlin and swordfish is needed to better link behavioural and morphological data with the aim of accomplishing a full comparative analysis.

scholarly journals FISHING GROUND, CACTH COMPOSITION, HOOK RATE AND LENGTH DISTRIBUTION OF BILLFISHES CAUGHT BY TUNA LONG LINE IN INDIAN OCEAN

2013 ◽  
Vol 19 (2) ◽  
pp. 85
Author(s):  
Fathur Rochman ◽  
Abram Barata ◽  
Budi Nugraha
Keyword(s):  
Indian Ocean ◽  
Average Length ◽  
Economic Value ◽  
Length Distribution ◽  
Fork Length ◽  
Fishing Ground ◽  
Istiophorus Platypterus ◽  
Blue Marlin ◽  
Long Line ◽  
Catch Composition

Billfishes area by cacth of tuna long line vessels in Indian Ocean. Billfish are consist of swordfish <em>Xiphias gladius</em>, black marlin <em>Makaira indica</em>, indo facific blue marlin <em>Makaira mazara</em>, stripe marlin <em>Tetrapturus audax</em>, indo facific sailfish <em>Istiophorus platypterus</em> and shortbill spearfish <em>Tetrapturus angustirostris</em>. Besides that, billfishes also have important economic value compared with tuna as an exsported species such as swordfish and marlin. To optimize the catch of billfishes in Indian Ocean, data and information of potential fishing ground, size and catch composition of this species are needed. The billfishes cacth composition collected in 2011 were dominated by 45% swordfish, 20% black marlin, 19% blue marlin,9% short bill spearfish, 6% sailfish and 1%stripe marlin. The billfishes size range which were caught between 60 - 280 cm LJFL (Lower Jaw Fork Length). The sword fish average length was 150 cm, blue marlin 197 cm, black Marlin 189 cm, sailfish 150cm ,short bill spearfish 144 cm and stripe marlin159 cm. From this observation, it was found that most of billfishes caught were in mature.

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

2017 ◽  
Vol 5 (4) ◽  
pp. 406-411
Author(s):  
Krisliyana Mia Anggarini ◽  
Suradi Wijaya Saputra ◽  
Abdul Ghofar ◽  
Bram Setyadji
Keyword(s):  
Indian Ocean ◽  
Data Processing ◽  
Growth Pattern ◽  
Condition Factor ◽  
Yellowfin Tuna ◽  
Survey Method ◽  
Thunnus Albacares ◽  
Microsoft Excel ◽  
Weight Relationship ◽  
The Indian Ocean

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

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