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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Effects of dietary shifts on the stable isotope signature of Pacific white shrimp Litopenaeus vannamei and implications for traceability

Li Li https://orcid.org/0000-0002-4130-5113 A B C , Natalee Kokkuar A , Cui Han A , Wenjing Ren A and Shuanglin Dong A B
+ Author Affiliations
- Author Affiliations

A The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003, PR China.

B Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, 266235, PR China.

C Corresponding author. Email: l_li@ouc.edu.cn

Marine and Freshwater Research 71(10) 1294-1300 https://doi.org/10.1071/MF19214
Submitted: 13 June 2019  Accepted: 2 December 2019   Published: 13 February 2020

Abstract

Because the number of mislabelled seafood products in the globalised market is increasing, there is a need for additional effective technologies to trace the origin of these products. Several issues need to be clarified regarding the δ13C and δ15N analyses used to trace seafood products in order to increase their reliability. Herein, a laboratory experiment involving dietary shifts was conducted with shrimp culture to demonstrate that dietary changes elicit isotope changes. Feeding shrimp four different food sources with different isotope values revealed a significant relationship for δ13C and δ15N values between shrimp and food sources (P < 0.05). The shrimp fed different brands of commercial feed had significantly different δ15N values (P < 0.05), but not the δ13C values (P > 0.05) at the end of the study. However, the δ13C and δ15N values for shrimp that were fed live food were much higher than those for shrimp fed on commercial feed (P < 0.05), indicating that it is more reliable to distinguish seafood products using a method with distinctively different food sources. The shrimp rapidly achieve isotopic equilibrium with their diets after 3 weeks, and, for traceability, it is recommended to sample shrimp being consistently fed with one feed for more than 3 weeks.

Additional keywords: authentication, stable isotope analysis.


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