Feeding ecology and consumption rates of yellowfin tuna (Thunnus albacares) in the eastern Arabian Sea

Varghese, Sijo P.; Somvanshi, Vishal Singh

doi:10.21077/ijf.2016.63.1.39681-03

Cited by 12 publications

(9 citation statements)

References 28 publications

(32 reference statements)

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“…Inshore, coastal fish predominated (53% by weight) in the diet of yellowfin tuna off the east coast of India with the rest represented mostly by purpleback flying squid Sthenoteuthis oualaniensis and swimming crabs (Rohit et al., 2010). A similar situation with predominance of the aforementioned two species and coastal fish (though to a lesser extent) was found off western coasts of India (Varghesi & Somvanshi, 2016).…”

Section: Discussionsupporting

confidence: 68%

Comparative feeding strategies of yellowfin tuna around St Helena and adjacent seamounts of the South Atlantic Ocean

Laptikhovsky

Naulaerts²,

Clingham³

et al. 2020

J Appl Ichthyol

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Yellowfin tuna are the mainstay of the traditional tuna fisheries in St Helena waters, but there is limited knowledge of their ecology and feeding behaviour in the area. In this study yellowfin tuna stomach contents were used to assess spatio‐temporal changes in feeding strategy and consider the role of tuna in the local ecosystem. Comparisons of the feeding spectra of yellowfin tuna between inshore regions of St Helena and oceanic seamounts demonstrated that in both areas the species was largely piscivorous. In inshore waters yellowfin consumed more neritic fauna, including significant numbers of crab megalopa, whereas around seamounts the diet included a greater diversity of epi‐ and mesopelagic fish and squids. The most important fish prey species in inshore waters was the St Helena butterflyfish Chaetodon sanctahelenae, and around seamounts was the pufferfish Lagocephalus lagocephalus. Results indicate that the diet spectrum of yellowfin tuna in St Helena waters is relatively similar to those of conspecifics living in waters with relatively low productivity, with strategies indicative of food‐poor ecosystems. The availability of coastal fauna may make areas around islands and seamounts more attractive for feeding aggregations of yellowfin tuna, compared to the open ocean. The relatively unselective feeding of yellowfin tuna means that stomachs can provide valuable data on the species diversity, particularly in remote areas with limited opportunities for dedicated research expeditions.

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Section: Discussionsupporting

confidence: 68%

Comparative feeding strategies of yellowfin tuna around St Helena and adjacent seamounts of the South Atlantic Ocean

Laptikhovsky

Naulaerts²,

Clingham³

et al. 2020

J Appl Ichthyol

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“…1). Skipjack and yellowfin tunas typically do not show sexual dimorphism: males and females share the same ecological niche as well as anatomical and behavioural similarities, with only the gonads able to differentiate them [41][42][43]. The same results were reported in both sticklebacks and salmon, for which the gut and skin microflorae did not vary between male and female individuals [44,45].…”

Section: Discussionsupporting

confidence: 60%

Fishing for the Bacteriome of Tropical Tuna

Gadoin

Desnues

D’Orbcastel

et al. 2021

Preprint

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Background : Although tunas represent a significant part of the global fish economy and a major nutritional resource worldwide, their consumption poses a risk of food poisoning through the development of particular bacterial pathogens. However, their microbiome still remains poorly documented. Here, we conducted a multi-compartmental analysis of the taxonomic composition of the bacterial communities inhabiting the gut, skin and liver of two most consumed tropical tuna species (skipjack and yellowfin), from individuals caught in the Atlantic and Indian oceans. Results : Our results revealed that the composition of the microbiome was independent of fish sex, regardless of the species and ocean considered. Instead, the main determinants were (i) tuna species for the gut and(ii) sampling site for the skin mucus layer, and (iii) a combination of both parameters for the liver. Interestingly, only 4.5% of all ASVs were shared by the three compartments, raising numerous questions about the circulation of microorganisms within the tuna body. Our results also revealed the presence of a unique and diversified bacterial assemblage within the liver, comprising a substantial proportion of histamine-producing bacteria, well known for their potential pathogenicity and their contribution to fish poisoning cases. Conclusions : These results indicate that the tuna liver is an unexplored microbial niche whose role in the health of both the host and consumers remains to be elucidated.

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“…Differences on the vertical distribution along tropical and temperate regions seems also to reflect in the trophic links of the viperfish. While C. sloani represents one of the most important prey items of epipelagic predators in several locations 10 , 35 , 36 , 52 , previous studies addressing the trophic ecology of epipelagic predators along the WTA do not mention a trophic relationship with the viperfish 9 , 53 . Moreover, SIA results do not evidence a well-defined trophic relationship between the viperfish and potential epipelagic predators.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, we included stable isotopic data on potential viperfish predators to infer whether this species is being consumed by epipelagic and/or bathypelagic species. Based on data availability, local fauna, and literature information 10 , 12 , 35 , 36 , the following species were considered as potential predators and thus included in the analyses: Ectreposebastes imus , Sphyraena barracuda , Coryphaena hippurus , Elagatis bipinnulata , Acanthocybium solandri , Katsuwonus pelamis , and Thunnus albacares .…”

Section: Methodsmentioning

confidence: 99%

Trophic ecology, habitat, and migratory behaviour of the viperfish Chauliodus sloani reveal a key mesopelagic player

Eduardo

Lucena‐Frédou

Mincarone

et al. 2020

Sci Rep

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Mesopelagic fishes are numerically the most important vertebrate group of all world’s oceans. While these species are increasingly threatened by anthropogenic activities, basic biological knowledge is still lacking. For instance, major uncertainties remain on the behaviour, ecology, and thus functional roles of mesopelagic micronektivores, particularly regarding their interactions with physicochemical features. Here, we examine the trophic ecology, habitat, and migratory behaviour of the viperfish (Chauliodus sloani)—a poorly known and abundant deep-sea species—to further understand the ecology and thus functional role of mesopelagic micronektivores. Moreover, we explore how physical drivers may affect these features and how these relationships are likely to change over large oceanic areas. The viperfish heavily preys on epipelagic migrant species, especially myctophids, and presents spatial and trophic ontogenetic shifts. Temperature restricts its vertical distribution. Therefore, its trophodynamics, migratory behaviour, and functional roles are expected to be modulated by the latitudinal change in temperature. For instance, in most tropical regions the viperfish stay full-time feeding, excreting, and serving as prey (e.g. for bathypelagic predators) at deep layers. On the contrary, in temperate regions, the viperfish ascend to superficial waters where they trophically interact with epipelagic predators and may release carbon where its remineralization is the greatest.

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Feeding ecology and consumption rates of yellowfin tuna (Thunnus albacares) in the eastern Arabian Sea

Cited by 12 publications

References 28 publications

Comparative feeding strategies of yellowfin tuna around St Helena and adjacent seamounts of the South Atlantic Ocean

Comparative feeding strategies of yellowfin tuna around St Helena and adjacent seamounts of the South Atlantic Ocean

Fishing for the Bacteriome of Tropical Tuna

Trophic ecology, habitat, and migratory behaviour of the viperfish Chauliodus sloani reveal a key mesopelagic player

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