Stomach Content of Three Tuna Species in the Eastern Indian Ocean

Setyadji, Bram; Bahtiar, Andi; Novianto, Dian

doi:10.15578/ifrj.18.2.2012.57-62

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…Except for the caecal mass, skipjack tuna showed higher activity of chitobiase than the Atlantic bonito in all digestive organs. Although fish stomach content is spatial variability-dependent, the predisposition of the skipjack tuna for crustacean consumption has been described in several locations, such as southern and northern California waters [ 53 , 54 ], eastern Indian Ocean [ 55 ], Laccadive Sea [ 56 ], tropical and subtropical Atlantic Ocean [ 57 ], West Africa coast [ 58 ] and Balearic Sea [ 12 ]. Chitobiase activity tends to be associated with those species consuming chitinous prey and lacking mechanical structures to disrupt their exoskeleton [ 59 , 60 ].…”

Section: Discussionmentioning

confidence: 99%

Characterization and comparison of the digestive physiology of two scombrids, Katsuwonus pelamis and Sarda sarda, in the Gulf of Cádiz

Dias¹,

Dardengo²,

Engrola³

et al. 2021

PLoS ONE

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Fish and other marine animals have a unique and intimate interaction with their surrounding environment. Diet type or trophic level play significant roles in modulating species digestive physiology. However, little is known about how the trophic niche influences digestive activity and gut microbiota in scombrids species. The aim of the present study was to analyse and describe the digestive physiology of the skipjack tuna (Katsuwonus pelamis) and the Atlantic bonito (Sarda sarda) as bioindicator of the feeding ecology and trophic niche for both species in the Gulf of Cádiz (Spain). For that, fish proximate composition, pH of digestive organs and digestive enzymes activity levels were analysed in 10 individuals of each species to gain insight into the digestive physiological adaptations of the two species of scombrids. In addition, intestinal microbiota composition was determined for the skipjack tuna. The integration of the results suggested a clear trophic niche segregation between both species. Stomach pH was associated in both species with infrequent feeding events. Body proximate composition and digestive lipases activity patterns pointed to a high predominance of lipids in the Atlantic bonito diet, suggesting oily fish as main prey. On the other hand, results supported the skipjack tuna as a highly opportunistic feeder with a more varied diet, including fish but also crustaceans as preys. The gut microbial community in the latter species is dominated by Firmicutes and Tenericutes at phylum level, and by Mycoplasma, Blautia and Dorea at genus level. The present study contributes to advance the knowledge on the feeding behaviour and physiology diversity in fish species as a result of adaptation to a particular habitat.

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Section: Discussionmentioning

confidence: 99%

Characterization and comparison of the digestive physiology of two scombrids, Katsuwonus pelamis and Sarda sarda, in the Gulf of Cádiz

Dias¹,

Dardengo²,

Engrola³

et al. 2021

PLoS ONE

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“…Ikan lemuru juga menjadi mangsa alami bagi jenis-jenis ikan yang lebih besar, seperti madidihang, tuna mata besar dan cakalang (Perera et al, 2015;Setyadji et al, 2012). Oleh karena itu, ikan lemuru dimanfaatkan sebagai umpan dalam pengoperasian rawai tuna yang beroperasi di Samudera Hindia (Barata et al, 2011;Uktolseja, 1992;Uktolseja 1993).…”

Section: Pendahuluanunclassified

“…Dalam studi isi alat pencernaan seringkali peneliti menemukan ikan yang telah hancur akibat proses pencernaan sebagai komposisi yang paling dominan, khususnya pada jenis tuna (Perera et al, 2015;Setyadji et al, 2012). Hal ini mengakibatkan kekosongan informasi jenis dan ukuran ikan yang dimangsa.…”

Section: Pendahuluanunclassified

KARAKTERISTIKMORFOLOGI DANHUBUNGANMORFOMETRIK OTOLITH DENGAN UKURAN IKAN LEMURU (Sardinella lemuru Bleeker, 1853) DI SELAT BALI

Wujdi¹

2017

BAWAL Widya Riset Perikanan Tangkap

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Otolith telah digunakan secara luas untuk kajian taksonomi, pertumbuhan, umur dan kekerabatan populasi ikan dari perairan yang berbeda. Penelitian ini bertujuan untuk mengetahui hubungan morfometrik otolith dan ukuran ikan lemuru serta karakteristikmorfologi otolith. Sampel dikumpulkan dari Selat Bali padaApril hingga Juli 2015. Pengujian statistik juga dilakukanmenggunakan uji-t berpasangan dua arah pada selang kepercayaan 99% untuk menentukan signifikansi hasil pengukuran morfometrik antara otolith kanan dan kiri. Hubungan parameter morfometrik dan ukuran ikan dianalisis menggunakan persamaan regresi linear dan eksponensial. Karakteristik morfologi otolith disajikan secara deskriptif dan dipertegas dengan nilai indeks-indeks bentuk menggunakan 6 deskriptor. Hasil penelitian menunjukkan bahwa tidak ada perbedaan yang signifikan pada pengukuran morfometrik otolith kiri dan kanan. Ukuran otolithmemiliki korelasi isometrik dengan pertumbuhan ikan dimana panjang otolith (OL) menjadi indikator terbaik untuk mengestimasi ukuran individu ikan. Otolith ikan lemuru memiliki ciri-ciri morfologi yang konsisten seperti halnya ikan dari genus Sardinella, khususnya sulcus acusticus, rostrum dan antirostrum. Nilai indeks bentuk yangmenegaskan ciri-ciri morfologi otolith juga dijelaskan.Otoliths widely used to determine taxonomy, growth, age and population structure of fishes. This study aims to determine the relationship between otolith morphometric to fish sizes and morphological characteristic of otolith. Data were collected from April to July 2015 in Muncar, Bali Strait. The statistical tests using two tails ttest paired sample also implemented to examine differentiation between left and right otolith measurement. The linear regression and exponential equation used to examine otolith morphometric parameter to fish size. Otolith morphological characteristics presented descriptively and emphasized using 6 descriptors of shape indices. The results showed no significant differences between left and right otolith. The otolith-fish size relationship was isometric. An OL (length of otolith) found as the best indicators to estimate the original size of fish. The otolith has specific morphological characteristics, in particular sulcus acusticus, rostrum and antirostrum were similar with other species from Sardinella genus. Shape indices also provided to confirm the morphological otolith.

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“…The nominal CPUE of bigeye tuna in Indonesian longline fishery from 2005-2017 showed a declining trend over the years, and the distribution of high CPUE occurred between 5-20 o S and 30-35 o S [11]. The proportion of zero-catches of BET in the scientific observer operational catch and effort data sets from 2005-2018 was considered low (~30%) [12]. The low of zero-catches of BET indicates targeting from the longline fishing gear.…”

Section: Introductionmentioning

confidence: 99%

Trends of Indonesia’s bigeye tuna longline fisheries in the Eastern Indian Ocean: Catch per unit effort and length distribution

Hartaty,

Setyadji,

Sadiyah

et al. 2023

E3S Web Conf.

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Bigeye tuna, Thunnus obesus (Lowe, 1839), is one of the primary target species for Indonesian tuna longliners operated in the eastern part of the Indian Ocean. However, the fishing trend and biological information are still scarce despite their importance in developing harvest strategy in the region. The study provides nominal catch per unit effort (CPUE) and length compositions of bigeye tuna caught by the Indonesian tuna longliners from the area. Data were obtained from records made by the onboard scientific observers assigned by the Research Institute for Tuna Fisheries (RITF) from 2006 to 2021. The data covers records from 3180 longline settings in 118 fishing trips in which more than 4 million hooks deployed. The fishing efforts were distributed between 0-35°S and 75-130°E, with 10 to 15 hooks between floats. The highest CPUE was 0.29±0.05 fish per 100 hooks in 2014, and the lowest was 0.09±0.05 fish per 100 hooks in 2021. From 8150 fish measurements in 2006 to 2021, the average size was 117.66±24.13 cm FL, and the dominant size class was 120–130 cmFL. While the average size of BET shows an increasing trend the CPUEs were declining.

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Stomach Content of Three Tuna Species in the Eastern Indian Ocean

Abstract: Feeding habit of tuna in Indian Ocean has been described around Sri Lanka, Indian Waters, Andaman Sea, western Indian Ocean (Seychelles Islands)

Cited by 7 publications

References 6 publications

Characterization and comparison of the digestive physiology of two scombrids, Katsuwonus pelamis and Sarda sarda, in the Gulf of Cádiz

Characterization and comparison of the digestive physiology of two scombrids, Katsuwonus pelamis and Sarda sarda, in the Gulf of Cádiz

KARAKTERISTIKMORFOLOGI DANHUBUNGANMORFOMETRIK OTOLITH DENGAN UKURAN IKAN LEMURU (Sardinella lemuru Bleeker, 1853) DI SELAT BALI

Trends of Indonesia’s bigeye tuna longline fisheries in the Eastern Indian Ocean: Catch per unit effort and length distribution

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