Mariculture has attracted much attention as a potential new source of food. Yet, the trophic efficiency of marine ecosystems is already high, making further improvements hard to achieve. Increasing marine food production may be possible by fishing at lower trophic levels, but the risks of such a practice must be considered.
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I thank E. Folmer, P. Herman and A. Rijnsdorp for providing helpful comments on an earlier draft of this Comment.
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van der Meer, J. Limits to food production from the sea. Nat Food 1, 762–764 (2020). https://doi.org/10.1038/s43016-020-00202-8
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