Assessment of the nutritional status of field-caught larval Pacific bluefin tuna by RNA/DNA ratio based on a starvation experiment of hatchery-reared fish

Tanaka, Yosuke; Satoh, Keisuke; Yamada, Harumi; Takebe, Takayuki; Nikaido, Hideki; Shiozawa, Satoshi

doi:10.1016/j.jembe.2007.10.007

Cited by 65 publications

(54 citation statements)

References 29 publications

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“…The nutritional status of field-caught tuna larvae collected in the north western Pacific Ocean was negatively correlated to the ambient prey densities. This study suggested that the nutritional condition of larval PBT was influenced by the ambient prey density, and starvation itself and starvation-induced predation could contribute to mortality during the larval period of PBT (Tanaka et al, 2008).…”

Section: Larval Nutritionmentioning

confidence: 83%

“…However, in order to assess the nutritional status of field-caught larval PBT, starvation experiments of hatchery-reared larvae were conducted and changes in the RNA/DNA ratio of fed and starved larvae analyzed (Tanaka et al, 2008). The poor survival rate of PBT larvae and immediate growth retardation suggested that PBT larvae have a very low tolerance to starvation.…”

Section: Larval Nutritionmentioning

confidence: 99%

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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: Larval Nutritionmentioning

confidence: 83%

Section: Larval Nutritionmentioning

confidence: 99%

Tuna Nutrition and Feeds: Current Status and Future Perspectives

Mourente

Tocher

2009

Reviews in Fisheries Science

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“…360 Unfortunately, our understanding of both sources of mortality is rather limited, especially in 361 lower latitudes and despite existing techniques and previous efforts to estimate actual starvation 362 mortality rates (e.g. Gronkjaer et al, 1997;Margulies, 1993;Tanaka et al, 2008). 363…”

Section: Discussion 307mentioning

confidence: 99%

Latitudinal and taxonomic patterns in the feeding ecologies of fish larvae: A literature synthesis

Llopiz

2013

Journal of Marine Systems

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Abstract. The longtime focus on factors that influence the survival of marine fish larvae has 1 yielded an extensive number of studies on larval fish diets and feeding success. In light of a 2 recent increase in such studies within lower latitudes, results from the peer-reviewed literature 3 were synthesized to examine both latitudinal and taxonomic differences in several trophic-related 4 categories, including feeding incidence, trophic niche breadth, ontogenetic diet shifts, dominant 5 prey types, diet broadness, and larval piscivory. A total of 204 investigations (taxon-article 6 combinations) contained suitable results for at least one of these categories. Feeding incidences 7 (proportions of larvae containing food) were significantly higher in lower latitudes with all taxa 8 combined, as well as only within the order Perciformes. Feeding incidences also differed among 9 orders, with Perciformes and Scorpaeniformes having the highest values. The number of larval 10 taxa exhibiting a significantly increasing niche breadth (SD of the log of prey sizes) with larval 11 size decreased toward lower latitudes, with some taxa in lower latitudes exhibiting a decrease in 12 niche breadth with size. The frequency of exhibiting ontogenetic diets shifts decreased with 13 decreasing latitude, as did relative diet broadness (a function of prey types). The most common 14 dominant prey types in the diets of higher latitude larvae were nauplii and calanoid copepods, 15 with cyclopoids being rare in higher latitudes. Dominant prey types in lower latitudes were more 16 diverse, with nauplii, calanoids, and cyclopoids being equally important. Appendicularians 17 increased in importance with decreasing latitude, and one of the clearest latitudinal distinctions 18 was the display of larval piscivory (almost exclusively by scombroid taxa), which was highly 19 concentrated in lower latitudes. Overall, the latitudinal differences observed for multiple trophic-20 related factors highlight inherent distinctions in larval fish feeding ecologies, likely reflecting 21 differences in the overall structure of planktonic food webs over large latitudinal gradients. 22 23 3

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“…Maximum specific growth rate: Maximum potential growth rates were obtained using age-length relationships from laboratory experiments in Pacific bluefin tuna larvae Thunnus thynnus orientalis (up to (Miyashita et al 2001, Sawada et al 2005, Tanaka et al 2008. A relationship between age and dry weight was fitted to estimate the maximum potential specific growth rate of Pacific bluefin tuna larvae at each temperature.…”

Section: Methodsmentioning

confidence: 99%

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Reglero¹,

Urtizberea²,

Torres³

et al. 2011

Mar. Ecol. Prog. Ser.

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Cannibalism among size classes may reduce starvation and improve survival of larval tuna in oligotrophic ocean areas, but it may also be a substantial mortality component depending on the availability of alternative prey. Here, we combine laboratory and field data on tuna larvae with a model of larval foraging and bioenergetics to explore the role of cannibalism in cohort development at different temperatures, durations of hatching period, hatching larval densities and natural mortality rates. Prey fields (zooplankton densities and co-occurrence of different larval stages of 3 species of tuna) were established from cruises in a main tuna spawning area around the Balearic Islands (Mediterranean Sea). Results suggest that a pure zooplankton diet is frequently insufficient to sustain larval growth. Piscivory can be a major source of larval mortality among tuna species and larvae hatched early can feed on abundant larvae of smaller size and have fewer predators themselves. We show how the intensity of cannibalism depends on the temperature dependent growth rate and the resulting relative size distribution when eggs are released continuously over a period of a few weeks. The predator-prey size distribution and the relative densities of these voracious larvae may produce overcompensation in recruitment under some environmental conditions.

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Assessment of the nutritional status of field-caught larval Pacific bluefin tuna by RNA/DNA ratio based on a starvation experiment of hatchery-reared fish

Cited by 65 publications

References 29 publications

Tuna Nutrition and Feeds: Current Status and Future Perspectives

Tuna Nutrition and Feeds: Current Status and Future Perspectives

Latitudinal and taxonomic patterns in the feeding ecologies of fish larvae: A literature synthesis

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

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