Length estimation of Atlantic bluefin tuna (<scp><i>Thunnus thynnus</i></scp>) using vertebrae

Andrews, Adam J.; Mylona, Dimitra; Rivera, Lucia; Winter, Rachel; Onar, Vedat; Siddiq, Abu Bakar; Tinti, Fausto; Morales‐Muñiz, Arturo

doi:10.1002/oa.3092

Cited by 4 publications

(11 citation statements)

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“…Height, width and length correspond to 35th vertebra measurements on the posterior centra as per Andrews et al . (2022a).…”

Section: Methodsmentioning

confidence: 99%

“…The 35th vertebra of each specimen was isolated, pertaining to one of the penultimate vertebrae in BFT which have a total of 39 vertebrae [for a guide on BFT vertebra identification see Andrews et al . (2022a)]. The 35th vertebra was selected for consistency between specimens and due to the fact that annuli (growth rings) are often more clearly interpreted in these vertebrae.…”

Section: Methodsmentioning

confidence: 99%

“…Fork length (FL) of archaeological specimens was estimated following Andrews et al . (2022a) using the online resource https://tunaarchaeology.org/lengthestimations. Briefly, vertebrae were identified to rank or type (see Andrews et al ., 2022a), vertebral centrum length, width and height was measured using digital callipers to the nearest 0.01 mm and the best‐fitting power regression model was applied for each specimen (Supporting Information Tables S1 and S2).…”

Section: Methodsmentioning

confidence: 99%

“…(2022a) using the online resource https://tunaarchaeology.org/lengthestimations. Briefly, vertebrae were identified to rank or type (see Andrews et al ., 2022a), vertebral centrum length, width and height was measured using digital callipers to the nearest 0.01 mm and the best‐fitting power regression model was applied for each specimen (Supporting Information Tables S1 and S2). Age estimation was not attempted due to the poor visibility of annuli in these archaeological specimens.…”

Section: Methodsmentioning

confidence: 99%

“…Age was estimated by counting annuli followingLee et al (1983) andAndrews et al (2023), as described in the methods. Height, width and length correspond to 35th vertebra measurements on the posterior centra as perAndrews et al (2022a).…”

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confidence: 99%

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Isotopic life‐history signatures are retained in modern and ancient Atlantic bluefin tuna vertebrae

Andrews

Orton

Onar

et al. 2023

Journal of Fish Biology

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Isotopic, tagging and diet studies of modern-day teleosts lacked the ability to contextualise life-history and trophic dynamics with a historical perspective, when exploitation rates were lower and climatic conditions differed. Isotopic analysis of vertebrae, the most plentiful hard-part in archaeological and museum collections, can potentially fill this data-gap. Chemical signatures of habitat and diet use during growth are retained by vertebrae during bone formation. Nonetheless, to fulfil their potential to reveal life-history and trophic dynamics, we need a better understanding of the time frame recorded by vertebrae, currently lacking due to a poor understanding of fish bone remodelling. To address this issue, the authors serially-sectioned four vertebral centra of the highly migratory Atlantic bluefin tuna (Thunnus thynnus; BFT) captured off Sardinia (Italy) and analysed their isotopic composition. They show how carbon (δ 13 C), nitrogen (δ 15 N) and sulphur (δ 34 S) isotope values can vary significantly across BFT vertebrae growth-axes, revealing patterning in dietary life histories. Further, they find that similar patterns are revealed through incremental isotopic analysis of inner and outer vertebrae centra samples from 13 archaeological BFT vertebrae dating between the 9th and13th centuries CE. The results indicate that multi-year foraging signatures are retained in vertebrae and allow for the study of life histories in both modern and paleo-environments. These novel methods can be extended across teleost taxa owing to their potential to inform management and conservation on how teleost trophic dynamics change over time and what their long-term environmental, ecological and anthropological drivers are.fish bone turnover, historical ecology, life histories of fishes, serial sectioning, stable isotope analysis | INTRODUCTIONRetrospective ecological studies are increasingly analysing the stable isotopic composition of teleost vertebrae due to the predominance of these bones in the archaeological records and potential to reveal how trophic dynamics respond to environmental, ecological and cultural shifts (Barrett et al., 2011;Ólafsd ottir et al., 2017). Nonetheless, little is known about how tissue turnover influences

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“…Height, width and length correspond to 35th vertebra measurements on the posterior centra as per Andrews et al . (2022a).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Isotopic life‐history signatures are retained in modern and ancient Atlantic bluefin tuna vertebrae

Andrews

Orton

Onar

et al. 2023

Journal of Fish Biology

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Lateral bone ridge expansion and internal tissue replacement for vertebral body growth in Pacific bluefin tuna Thunnus orientalis

Sakashita,

Kondo,

Wada

2023

Journal of Morphology

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Vertebral growth is an essential developmental process to support the expansion of the vertebrate body. In teleosts, the lateral side of the vertebral bodies develops to form different structures among species in the late stages of vertebral growth, although lateral structures are not apparent in the early stages. Lateral structures are one of the structural features that determine the diversity of teleost vertebrae. However, explanations for the formation of lateral structures are conflicting because few reports have investigated the growth of teleost vertebral bodies. To clarify the growth process, we analyzed the morphological changes in the vertebral body of Pacific bluefin tuna Thunnus orientalis at different developmental stages using micro‐computed tomography (CT) scans. The micro‐CT scans showed that the vertebral centrum formed a plate‐like ridge on the lateral side along the cranial–caudal direction and extended laterally with increasing thickness. Simultaneously, the proximal region of the lateral ridges became porous as the vertebrae grew to form bone marrow cavities. Furthermore, we used histological observations to describe the relationship between these morphological changes and osteoblast and osteoclast activities. Osteoblasts accumulated on the distal edges of the lateral ridges, whereas osteoclasts were distributed in the bone marrow cavities. These observations suggest that bone resorption occurs proximally to form bone marrow cavities in addition to bone synthesis at the edges of the lateral ridges. The bone marrow cavities were occupied by blood vessels, extracellular matrix, and adipocytes, and the internal tissue composition changed to increase the area of adipose tissue. Because the ratio of bone volume decreases in large vertebrae, bone formation and resorption are regulated to separate the external cortical and internal trabecular bones to support the vertebrae. This study is the first to report the formation of lateral structures and can be applied to similar lateral structures in the vertebrae of other teleost species.

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Vertebrae reveal industrial-era increases in Atlantic bluefin tuna catch-at-size and juvenile growth

Andrews

Natale²,

Addis

et al. 2023

ICES Journal of Marine Science

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Climate change and size-selective overexploitation can alter fish size and growth, yet our understanding of how and to what extent is limited due to a lack of long-term biological data from wild populations. This precludes our ability to effectively forecast population dynamics and support sustainable fisheries management. Using modern, archived, and archaeological vertebrae dimensions and growth rings of one of the most intensely exploited populations, the eastern Atlantic and Mediterranean bluefin tuna (Thunnus thynnus, BFT), we estimated catch-at-size and early-life growth patterns from the 3 rd century bce to the 21 st century ce to understand responses to changes in its environment. We provide novel evidence that BFT juvenile growth increased between the 16 th–18 th, 20 th, and 21 st centuries, and is correlated with a warming climate and likely a decrease in stock biomass. We found it equally plausible that fisheries-induced evolution has acted to increase juvenile BFT growth, driving earlier maturation as a result of size-selective exploitation. Coincidently, we found limited evidence to suggest a long history of large ( >200 cm FL) BFT capture. Instead, we found that the catch-at-size of archaeological BFT was relatively small in comparison with more intensive, 20 th and 21 st century tuna trap fisheries which operated further from shore. This complex issue would benefit from studies using fine-scale biochronological analyses of otoliths and adaptation genomics, throughout the last century especially, to determine evolutionary responses to exploitation, and further disentangle the influence of temperature and biomass on fish growth.

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Length estimation of Atlantic bluefin tuna (Thunnus thynnus) using vertebrae

Cited by 4 publications

References 40 publications

Isotopic life‐history signatures are retained in modern and ancient Atlantic bluefin tuna vertebrae

Isotopic life‐history signatures are retained in modern and ancient Atlantic bluefin tuna vertebrae

Lateral bone ridge expansion and internal tissue replacement for vertebral body growth in Pacific bluefin tuna Thunnus orientalis

Vertebrae reveal industrial-era increases in Atlantic bluefin tuna catch-at-size and juvenile growth

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