Optimal period for the effective promotion of initial swim bladder inflation in yellowfin tuna,
            <i>Thunnus albacares</i>
            (Temminck and Schlegel), larvae

Honryo, Tomoki; Kurata, Michio; Guillen, Angel; Tamura, Yoshiki; Cano, Amado; Stein, Maria S.; Margulies, Daniel; Scholey, Vernon P.; Sawada, Yoshifumi

doi:10.1111/are.13355

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Survival of tuna larvae in artificial rearing has been reported to be relatively low compared to other fish species (Miyashita, 2002). Multiple factors are thought to contribute to mortality of larval tuna in rearing systems during the early larval stages, such as suboptimal physical condition, including increased bacterial loads, surface adhesion and, of course, malnutrition as an added negative effect (Margulies et al, 2016;Honryo et al, 2017). At these early stages, the vitality and strength of the larvae also depends to a great extent on broodstock nutrition and the quality of the eggs and yolk sac larvae produced, and this may vary with and within every spawned batch.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of different feeding protocols for larvae of Atlantic bluefin tuna (Thunnus thynnus L.)

et al. 2019

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Mass mortality is still one of the main constraints in larval rearing of Atlantic bluefin tuna (Thunnus thynnus L.; ABT). Early data related to the feeding sequence of ABT larvae suggested that mortality observed during the first stages of life could be partly due to nutritional deficiencies. Previous studies demonstrated that copepods appeared to be a superior live prey compared to rotifers during the first two weeks of life. Our overarching aim was to evaluate different feeding strategies during first feeding of ABT larvae from a performance, compositional and molecular perspective. In order to do so, two groups of ABT larvae were fed with either copepod (Acartia tonsa; C) nauplii or rotifers (Brachionus rotundiformis; R) enriched with Algamac 3050 ® from mouth opening to 13 days after hatching (dah). After this, the group C-larvae was fed either Artemia enriched with Algamac 3050 ® (CA), Acartia nauplii and copepodites (CC) or sea bream (Sparus aurata) yolk-sac larvae (CY), while the R group were fed on Artemia enriched with Algamac 3050 ® (RA) up to 18 dah. At 13 dah, larvae fed copepods (C) had grown better than those fed enriched rotifers (R) although there were no significant differences in survival. ABT larvae fed R accumulated highest eicosapentaenoate (EPA) but lowest docosahexaenoate (DHA) and total n-3 long-chain polyunsaturated fatty acids (LC-PUFA) than C-fed larvae, reflecting the dietary contents. There was no activation in the expression of the enzymes involved in EPA and DHA biosynthesis. However, the different live prey showed regulation of transcription factor, digestive enzyme, lipid metabolism and oxidative stress genes. At 18 dah, larvae fed CY and CA treatments were largest in size, with larvae fed RA displaying the lowest growth, with no significant differences in survival among the dietary treatments. The highest DHA contents were found in ABT larvae fed CC and CY, whereas the lowest contents were found in RAfed larvae. Indeed, larvae fed RA showed the highest level of the intermediate product n-3 docosapentaenoate, which could reflect increased activity of the biosynthetic pathway although this was not supported by gene expression data.

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Section: Discussionmentioning

confidence: 99%

Evaluation of different feeding protocols for larvae of Atlantic bluefin tuna (Thunnus thynnus L.)

et al. 2019

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“…The overall mean survival for each treatment in our experiments (1.4–7.5%) was not unreasonably low, especially in the first 10 d.a.h., which is a period of very high mortality for tuna larvae (Margulies et al ). Multiple factors are thought to contribute to larval mortality of tuna in rearing systems during the early larval stages, such as malnutrition, suboptimal physical conditions, including increased bacterial loads, and surface adhesion (Margulies et al ; Honryo et al ).…”

Section: Discussionmentioning

confidence: 99%

A Comparison of the Effects of Two Prey Enrichment Media on Growth and Survival of Pacific Bluefin Tuna, Thunnus orientalis, Larvae

Stein

Margulies

Wexler

et al. 2017

J World Aquaculture Soc

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Three experiments were conducted to investigate the growth, survival, and standardized cohort biomass of Pacific bluefin tuna, Thunnus orientalis, larvae fed nutritionally enhanced prey during the first week of feeding using two commonly used, commercially available enrichment media, AlgaMac Enrich and Marine Glos. T. orientalis larvae exhibited exponential growth in standard length and dry weight. The daily specific growth rates in length and weight are the first reported for T. orientalis larvae and the averages ranged from 3.8 to 4.1% and 27.5%, respectively, for larvae in the AlgaMac treatment and from 4.1 to 6.1% and 31.5%, respectively, in the Marine Glos treatment. Average daily growth rates in length ranged from 0.16 to 0.23 mm/d for larvae in the AlgaMac treatment and from 0.17 to 0.27 mm/d for those in the Marine Glos treatment. Daily growth rates in length were similar to those reported for other tuna larvae reared in the laboratory but slower than most published estimates for larval tunas in situ at similar water temperatures. Mean prey number per gut was positively associated with mean prey level in the tank. Both enrichment media appear to be good sources of nutritional improvement of planktonic prey for T. orientalis larvae.

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Optimal period for the effective promotion of initial swim bladder inflation in yellowfin tuna, Thunnus albacares (Temminck and Schlegel), larvae

Cited by 2 publications

References 9 publications

Evaluation of different feeding protocols for larvae of Atlantic bluefin tuna (Thunnus thynnus L.)

Evaluation of different feeding protocols for larvae of Atlantic bluefin tuna (Thunnus thynnus L.)

A Comparison of the Effects of Two Prey Enrichment Media on Growth and Survival of Pacific Bluefin Tuna, Thunnus orientalis, Larvae

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