About the Authors

Rebecca A. Brociek

Roles Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Writing – original draft, Writing – review & editing

rebecca.brociek@nottingham.ac.uk (RAB); david.gardner@nottingham.ac.uk (DSG)

Affiliation School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom

Dongfang Li

Roles Data curation, Validation, Writing – review & editing

Affiliation School of Biosciences, University of Nottingham, Nottingham, United Kingdom

Richard Broughton

Roles Data curation, Validation, Writing – review & editing

Affiliation Institute of Aquaculture, University of Stirling, Stirling, Scotland

David S. Gardner

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Software, Supervision, Validation, Writing – original draft, Writing – review & editing

rebecca.brociek@nottingham.ac.uk (RAB); david.gardner@nottingham.ac.uk (DSG)

Affiliation School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom

Competing Interests

DSG conducts nutritional analysis for one of the tested companies’ foods. D.S.G is not involved in the formulation of the food, nor has influence on the design or reporting of results. Since completing the analysis, R.A.B has purchased shares in the same company; testing was completed before this occurred. This does not alter our adherence to PLOS ONE policies on sharing data and materials. There are no patents, products in development or marketed products associated with this research to declare.