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

摘要: The use of stable isotope analysis to study animal diets requires estimates isotopic turnover rates (half time, t50) and discrimination factors (Δ) for an accurate interpretation trophic patterns. isotopes carbon nitrogen were analysed eggs reared larvae Thunnus thynnus, as well the different supplied during experiment. results showed high values δ15N in (n=646) until 4 DAH. After this time lapse, declined progressively 12 DAH, when notochord flexion began. δ13C inverse trend, suggesting that maternal inheritance is evident pre-flexion stages. This proposes a model estimating signatures bluefin broodstock. flexion, fed with aquaculture-bred gilthead seabream, which resulted rapid increase together decrease values. estimated half-time reach steady state from diet was 2.5±0.3 days factor 0.4±0.3(‰). These represent first data set has allowed larval stages tuna be estimated.