The Southern Bluefin Tuna Mucosal Microbiome Is Influenced by Husbandry Method, Net Pen Location, and Anti-parasite Treatment

Minich, Jeremiah J.; Power, Cecilia; Melanson, Michaela; Knight, Rob; Webber, Claire; Rough, Kirsten; Bott, Nathan J.; Nowak, Barbara F.; Allen, Eric E.

doi:10.3389/fmicb.2020.02015

Cited by 16 publications

(21 citation statements)

References 100 publications

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“…Specifically, for scombrids, scarce information is available about gut microbiota composition. Alpha-diversity indexes values in the present study are in line with those described previously for other scombrids, such Spanish and king mackerel ( Scomberomorus maculatus and Scomberomorus cavalla , respectively) [ 65 ] and southern bluefin tuna [ 68 ]. Ley et al [ 69 ] described an inverse relation between gut microflora phylogenetic diversity and trophic level, being diversity higher in herbivorous than in carnivores’ organisms.…”

Section: Discussionsupporting

confidence: 92%

“…This intra-specific variability in the bacterial relative abundance has been also described for other fish species such as the grey mullet ( Mugil cephalus ) [ 70 ] and codfishes [ 71 ]. Tenericutes has been also identified as the dominant gut community in the southern bluefin tuna and king mackerel, while Firmicutes in Spanish mackerel [ 65 , 68 ], suggesting that both phyla are part of the microbiota of scombrids. At genus level, gut microbial composition had higher proportion of Mycoplasma (Tenericutes Phylum), followed by Blautia and Dorea (Firmicutes phylum) and Bifidobacterium (Actinobacteria phylum).…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionsupporting

confidence: 92%

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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show abstract

“…3). These phyla typically dominate within the skin microbiome of fish species [14,29,[58][59][60]. Geographic and seasonal variations in the composition of the skin microflora have been recently reported in marine mammals, corals and fishes [10,12,61], suggesting that environmental conditions (biotic and abiotic) are strong determinants of the skin microbiome.…”

Section: Discussionmentioning

confidence: 99%

“…However, the consumption of tuna also poses a health risk, with the occasional development of histamine-producing bacteria (HPB) responsible for frequent fish poisoning cases [27,28]. Finally, despite the considerable nutritional value of this resource as well as the health hazard associated with its consumption, knowledge of the microbiome of tuna remains rudimentary [29].…”

Section: Introductionmentioning

confidence: 99%

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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“…The intestinal microbiota is important for the health and development of bluefin tuna, however, studies on this topic are limited [ 16 , 17 ]. Minich et al [ 17 ] investigated the microbial diversity associated with mucosal membranes, including the gut farmed southern bluefin tuna ( Thunnus maccoyii ) and showed that the microbiota structure was affected by pontoon location and treatment with an antihelminthic drug. Gatesoupe et al [ 16 ] investigated the change in intestinal microbiota in Atlantic bluefin tuna Thunnus thynnus larvae and showed that the microbiota varied greatly among individuals.…”

Section: Introductionmentioning

confidence: 99%

Succession of the intestinal bacterial community in Pacific bluefin tuna (Thunnus orientalis) larvae

Taniguchi

Aoki²,

Inoue³

et al. 2022

PLoS ONE

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We investigated the succession process of intestinal bacteria during seed production in full-cycle aquaculture of Pacific bluefin tuna (Thunnus orientalis). During the seed production, eggs, healthy fish, rearing water, and feeds from three experimental rounds in 2012 and 2013 were collected before transferring to offshore net cages and subjected to a fragment analysis of the bacterial community structure. We identified a clear succession of intestinal bacteria in bluefin tuna during seed production. While community structures of intestinal bacteria in the early stage of larvae were relatively similar to those of rearing water and feed, the bacterial community structures seen 17 days after hatching were different. Moreover, although intestinal bacteria in the late stage of larvae were less diverse than those in the early stage of larvae, the specific bacteria were predominant, suggesting that the developed intestinal environment of the host puts selection pressure on the bacteria in the late stage. The specific bacteria in the late stage of larvae, which likely composed ‘core microbiota’, were also found on the egg surface. The present study highlights that proper management of the seed production process, including the preparation of rearing water, feeds, and fish eggs, is important for the aquaculture of healthy fish.

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The Southern Bluefin Tuna Mucosal Microbiome Is Influenced by Husbandry Method, Net Pen Location, and Anti-parasite Treatment

Cited by 16 publications

References 100 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

Fishing for the Bacteriome of Tropical Tuna

Succession of the intestinal bacterial community in Pacific bluefin tuna (Thunnus orientalis) larvae

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