The energetic consequence of specific dynamic action in southern bluefin tuna<i>Thunnus maccoyii</i>

Fitzgibbon, Quinn P.; Seymour, Roger S.; Ellis, David J.; Buchanan, J.

doi:10.1242/jeb.02641

Cited by 52 publications

(67 citation statements)

References 42 publications

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“…In this context, RMR in fasting SBT can be estimated as 0.15 MJ per kg body mass per day. The effect of feeding on the rate of oxygen consumption (M O2 ) was also determined in SBT (Fitzgibbon et al, 2007 similar to that of other fish species, the absolute energetic cost of SDA was much higher. The ration that SBT require to equal the combined metabolic costs of SDA and RMR was estimated to be 3.5% M b of Australian sardines per day (Fitzgibbon et al, 2007).…”

Section: Energysupporting

confidence: 54%

Tuna Nutrition and Feeds: Current Status and Future Perspectives

Mourente

Tocher

2009

Reviews in Fisheries Science

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Aquaculture is providing an ever-increasing proportion of fish in the human food basket prompting a search for new species to expand the range available to consumers. Large tunids/scombrids have long-since been a very valuable resource providing not only high quality protein, but also a rich source of the highly beneficial omega-3 (or n-3) long-chain polyunsaturated fatty acids including eicosapentaenoic and, especially docosahexaenoic acids in the human diet. Consequently, there is considerable interest worldwide in developing the culture of large tunids, including Atlantic northern bluefin tuna (Thunnus thynnus), Pacific bluefin tuna (Thunnus orientalis), southern bluefin tuna (Thunnus maccoyii) and yellowfin tuna (Thunnus albacares). Nutrition is vital to this development, playing key roles in reproductive success, including the establishment of successful broodstock producing high quality eggs and larvae, and ultimately the cost-effective production of nutritious seafood.This review summarises the rather fragmentary data that compromise the current state-of-theart in relation to tuna nutrition and the development of artificial, formulated feeds for these species. In highlighting the various considerable challenges that feed development will pose, we discuss the future perspectives for tuna culture in terms of both fish and human nutrition and welfare, against the background of diminishing global marine resources.3

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Section: Energysupporting

confidence: 54%

Tuna Nutrition and Feeds: Current Status and Future Perspectives

Mourente

Tocher

2009

Reviews in Fisheries Science

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“…Early attempts at measuring the metabolic rate (Zoxygen consumption rate) of anaesthetized and immobilized tuna suggested that values were much higher than in other fishes (Stevens 1972;Brill 1979;Brill 1987;Bushnell et al 1990;Bushnell & Brill 1992). Recent advances in tuna transportation and in the construction of holding facilities have enabled some long-term (more than 20 hours) metabolic measurements of tuna while swimming at relatively low, but steady speeds Blank et al 2007a,b;Fitzgibbon et al 2007Fitzgibbon et al , 2008. These studies support the presence of an elevated routine metabolic rate in tuna, albeit lower than first suggested, but it is the presumed maximum metabolic rate that gives tuna their highly aerobic and athletic reputation.…”

Section: Introductionmentioning

confidence: 99%

“…This is possible in bluefin tuna because the visceral heat derived from digestion is conserved by discrete visceral heat exchangers rather than being lost via peripheral blood vessels and gills that remain at ambient water temperature (Carey et al 1971;Carey 1973;Stevens & Carey 1981;Stevens & McLeese 1984;Fudge & Stevens 1996). More recent work has shown that this thermal increment appears closely associated with an increase in oxygen consumption rates ( Fitzgibbon et al 2007). There is an expectation that the increases in circulatory oxygen transport and visceral blood perfusion required for digestion in bluefin tuna are largely regulated by an increase in f H , although no study has measured cardiovascular function during ingestion and digestion of food in any tuna species to investigate this.…”

Section: Introductionmentioning

confidence: 99%

Moving with the beat: heart rate and visceral temperature of free-swimming and feeding bluefin tuna

et al. 2008

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Owing to the inherent difficulties of studying bluefin tuna, nothing is known of the cardiovascular function of free-swimming fish. Here, we surgically implanted newly designed data loggers into the visceral cavity of juvenile southern bluefin tuna (Thunnus maccoyii ) to measure changes in the heart rate ( f H ) and visceral temperature (T V ) during a two-week feeding regime in sea pens at Port Lincoln, Australia. Fish ranged in body mass from 10 to 21 kg, and water temperature remained at 18-198C. Pre-feeding f H typically ranged from 20 to 50 beats min K1. Each feeding bout (meal sizes 2-7% of tuna body mass) was characterized by increased levels of activity and f H (up to 130 beats min K1 ), and a decrease in T V from approximately 20 to 188C as cold sardines were consumed. The feeding bout was promptly followed by a rapid increase in T V , which signified the beginning of the heat increment of feeding (HIF). The time interval between meal consumption and the completion of HIF ranged from 10 to 24 hours and was strongly correlated with ration size. Although f H generally decreased after its peak during the feeding bout, it remained elevated during the digestive period and returned to routine levels on a similar, but slightly earlier, temporal scale to T V . These data imply a large contribution of f H to the increase in circulatory oxygen transport that is required for digestion. Furthermore, these data oppose the contention that maximum f H is exceptional in bluefin tuna compared with other fishes, and so it is likely that enhanced cardiac stroke volume and blood oxygen carrying capacity are the principal factors allowing superior rates of circulatory oxygen transport in tuna.

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“…Entretanto, quando são comparados os resultados do pampo com outras espécies em que foi utilizada metodologia similar, os resultados do pampo são mais próximos, 0,66mgO 2 g -1 h -1 para Rachycentron canadum (FEELEY et al, 2007) e 0,46mgO 2 g -1 h -1 para Thunnus maccoyii (FITZGIBBON et al, 2007). Entretanto, é preciso considerar que o consumo de oxigênio é influenciado por fatores bióticos e abióticos (JOBLING, 1994), assim as diferenças observadas podem ser explicadas por outros fatores, além da metodologia aplicada.…”

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“…Para R. canadum (10g), o consumo de oxigênio pós-prandial foi 1,2 vezes maior que o valor observado com os peixes em jejum (FEELEY et al, 2007), já para o pampo foi 1,4 vezes superior. Consumo de oxigênio pós-prandial ainda maior foi observado para Sirulus meridionales (37g), Thunnus maccoyii (10kg) e Sparus auratus (7g), respectivamente, de 1,9, 2,8 e 4,3 vezes maior que o observado para peixes em jejum (REQUENA et al, 1997;FU et al, 2005;FITZGIBBON et al, 2007). O efeito pós-prandial varia em duração e amplitude de acordo com a espécie, o estágio de vida, o peso, o status nutricional, a composição e a quantidade de alimento ofertado (BEAMISH & TRIPPEL, 1990).…”

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