Commentary: Comparing efficiency in aquatic and terrestrial animal production systems

Michael Tlusty, Peter Tyedmers, Friederike Ziegler, Malin Jonell, Patrik J.G. Henriksson, Richard Newton, Dave Little, Jillian Fry, Dave Love, Ling Cao

Research output: Contribution to journalArticlepeer-review


Aquaculture is receiving increased attention from a variety of stakeholders. This is largely due to its current role in the global food system of supplying more than half of the seafood consumed, and also because the industry continues to steadily expand (UN Food and Agriculture Organization 2018). A recent article in Environmental Research Letters, 'Feed conversion efficiency in aquaculture: Do we measure it correctly?', by Fry et al (2018a) found that measuring feed conversion efficiency of selected aquatic and terrestrial farmed animals using protein and calorie retention resulted in species comparisons (least to most efficient) and overlap among species dissimilar from comparisons based on widely used weight-based feed conversion ratio (FCR) values. The study prompted spirited discussions among researchers, industry representatives, and others. A group assembled to write a standard rebuttal, but during this process, decided it was best to engage the study's original authors to join the discourse. Through this collaboration, we provide the resultant additional context relevant to the study in order to advance conversations and research on the use of efficiency measures in aquatic and terrestrial animal production systems.

Original languageEnglish (US)
Article number128001
JournalEnvironmental Research Letters
Issue number12
StatePublished - Dec 2018

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health


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