Size-related differences in growth and survival in piscivorous fish larvae fed different prey types

Reglero, Patricia; Ortega, Aurelio; Blanco, Edurne; Fiksen, Øyvind; Viguri, F.J.; Gándara, Fernando de la; Seoka, Manabu; Folkvord, Arild

doi:10.1016/j.aquaculture.2014.05.050

Cited by 25 publications

(22 citation statements)

References 27 publications

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“…Under rearing conditions, the trophic shift from planktivory to piscivory is crucial for larval growth (Reglero et al 2014). At the end of the flexion stage, ABFT larvae need to predate on larger and faster preys (Ortega et al 2011).…”

Section: Isotopic Variationmentioning

confidence: 99%

“…These have the necessary natatory and visual capacities to predate efficiently. Furthermore, ABFT larvae also show a precocious development of the digestive sys-tem that allows them to undergo the early diet shift to piscivory and contribute to their rapid somatic growth (Miyashita et al 2001, Reglero et al 2014, Yúfera et al 2014.…”

Section: Post-flexion Discrimination Factorsmentioning

confidence: 99%

“…The few experimental studies based on hatchery-reared bluefin larvae address growth variability issues (Miyashita et al 2001, Reglero et al 2014, nutritional condition variability (Tanaka et al 2010) and prey-dependent larval growth variability using stable isotope analysis (SIA) as food tracers (Tanaka et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…ABFT larvae are fast-growing, showing a rapid development of internal organs, including that of the digestive system (Miyashita et al 2001, Kaji 2003, Yúfera et al 2014. Considering the high nutritional requirements for developing fast developmental rates, some authors have suggested that the feeding shift from a planktivorous to a piscivorous diet is particularly important for survival in this species (Tanaka et al 2014, Reglero et al 2014.…”

Section: Introductionmentioning

confidence: 99%

“…Although it is generally thought that cannibalism may be one of the main sources of feeding success at early life stages of bluefin (Reglero et al 2011(Reglero et al , 2014, stomach content analysis has not been able to verify piscivory in field-captured ABFT larvae (Catalan et al 2011). By contrast, piscivory in ABFT larvae has been observed in the Gulf of Mexico (Llopiz et al 2010(Llopiz et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

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Isotopic discrimination factors and nitrogen turnover rates in reared Atlantic bluefin tuna larvae (<em>Thunnus thynnus</em>): effects of maternal transmission

et al. 2016

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Summary:The use of stable isotope analysis to study animal diets requires estimates of isotopic turnover rates (half time, t 50 ) and discrimination factors (Δ) for an accurate interpretation of trophic patterns. The stable isotopes of carbon and nitrogen were analysed for eggs and reared larvae of Thunnus thynnus, as well as for the different diets supplied during the experiment. The results showed high values of δ 15 N in eggs and larvae (n=646) until 4 DAH. After this time lapse, the stable isotope values declined progressively until 12 DAH, when notochord flexion began. The δ 13 C showed an inverse trend, suggesting that maternal inheritance of the stable isotopes is evident until pre-flexion stages. This study proposes a model for estimating maternal isotopic signatures of bluefin broodstock. After notochord flexion, larvae were fed with aquaculture-bred gilthead seabream, which resulted in a rapid increase of bluefin larvae δ 15 N values together with a rapid decrease in δ 13 C values. The estimated nitrogen half-time to reach the steady state from the diet was 2.5±0.3 days and the discrimination factor was 0.4±0.3(‰). These results represent the first data set that has allowed isotopic nitrogen turnover rates and discrimination factors of the larval stages of bluefin tuna to be estimated.Keywords: bluefin tuna larvae; stable isotopes; maternal transmission; discrimination factors; nitrogen turnover ratio. Factores de discriminación y tasas de renovación isotópica de nitrógeno en larvas de atún rojo de cultivo (Thunnus thynnus): efectos de la transferencia maternaResumen: El análisis de isótopos estables para estudiar la dieta de los animales requiere estimaciones de las tasas de rotación isotópicas (tiempo medio, t 50 ) y factores de discriminación (Δ) para una correcta interpretación de los patrones tróficos. Los isótopos estables de carbono y nitrógeno se analizaron en los huevos y larvas criadas de Thunnus thynnus, así como para las diferentes dietas suministradas durante el experimento. Los resultados mostraron altos valores de δ 15 N en huevos y larvas (n=646) hasta cuatro días después de eclosionar. Después de este lapso de tiempo, los valores de los isótopos estables disminuyeron progresivamente hasta el día 12, cuando se inició la flexión de la notocorda. El δ 13 C mostró una tendencia inversa, lo que sugiere que la herencia materna de los isótopos estables es evidente en la etapa de pre-flexión. Este estudio propone un modelo para estimar las firmas isotópicas maternas de reproductores de atún rojo. Después de la flexión de la notocorda, las larvas se alimentaron con larvas recién eclosionadas de dorada, lo que dio lugar a un rápido aumento de los valores de δ 15 N en las larvas de atún rojo, junto con una rápida disminución del δ 13 C. El tiempo medio de nitrógeno para alcanzar el equilibrio con la dieta fue de 2,5±0,3 días y el factor de discriminación fue de 0,4±0,3(‰). Estos resultados representan el primer conjunto de datos que permitió la estimación de la tasa de renovación isotópica de nit...

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Section: Isotopic Variationmentioning

confidence: 99%

Section: Post-flexion Discrimination Factorsmentioning

confidence: 99%