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Swordfish or Shark Slice? A Rapid Response by COIBar-RFLP
Venera Ferrito1, Alessandra Raffa2, Luana Rossitto3
1Department of Biological, Geological and Environmental Sciences, Section of Animal Biology "M. La Greca", University of Catania, Via Androne 81, 95124 Catania, Italy. vferrito@unict.it.
Foods (Basel, Switzerland)
|November 6, 2019
Summary
A new molecular method, COI-RFLP, effectively detects seafood fraud by identifying species substitution in swordfish. This technique can authenticate seafood and improve supply chain transparency.
Area of Science:
- Molecular biology
- Food science
- Marine biology
Background:
- Consumer demand for market transparency and seafood traceability is increasing.
- Species authentication is crucial for preventing seafood fraud.
- Commercial fraud through species substitution is a significant issue in the seafood trade.
Purpose of the Study:
- To propose a molecular strategy, COI-RFLP, for detecting species substitution in the swordfish trade.
- To identify mislabeled species in commercial swordfish products.
- To develop a tool for assessing seafood authenticity and combating fraud.
Main Methods:
- Utilized cytochrome oxidase I (COI) barcoding for species identification.
- Employed COI barcode-restriction fragment length polymorphism (COIBar-RFLP) analysis.
- Used the MboI restriction endonuclease for enzymatic digestion of COI amplicons.
- Conducted phylogenetic analyses using multiple molecular markers.
Main Results:
- Identified species like Prionace glauca, Mustelus mustelus, and Oxynotus centrina in samples labeled as Xiphias gladius.
- COIBar-RFLP successfully discriminated between the four species.
- Observed an intraspecific differential MboI pattern in swordfish samples, distinguishing two clades.
- Phylogenetic analyses revealed two distinct clades within the swordfish species.
Conclusions:
- COIBar-RFLP is a viable molecular tool for detecting seafood fraud and ensuring authenticity.
- The study highlights the need for stronger regulations and molecular tools to combat seafood supply chain fraud.
- The developed method can differentiate swordfish clades, aiding in traceability and authenticity verification.