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Comment on “Egg consumption in mature Pacific salmon (Oncorhynchus spp.)”

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In their recent article, “Egg consumption in mature Pacific salmon (Oncorhynchus spp.)” (Can. J. Fish. Aquat. Sci. 66(9):1546–1553), Garner et al. observed salmon eggs in the stomach contents of mature Chinook, coho, and chum salmon. Through experimentation and simulation of salmon energetics, the authors conclude that the observed feeding represents an important gain in energy, challenging the accepted paradigm that assumes salmon energy budgets contain no gains once adults return to freshwater. Here, I argue that Garner et al. have overestimated the energetic consequence of egg consumption and that the observed consumption rates do not represent biologically significant gains in energy.

Dans un article récent, «Egg consumption in mature Pacific salmon (Oncorhynchus spp.)» (J.Can. Sci. Haleut. Aquat. 66(9): 1546–1553), Garner et al. ont noté la présence d’œufs de saumons dans les contenus stomacaux de saumons chinook, coho et kéta matures. Par des expériences et des simulations de l’énergétique des saumons, les auteurs concluent que la consommation observée représente un gain important d’énergie, ce qui met en doute le paradigme accepté qui assume que les bilans énergétiques des saumons ne font aucun gain une fois les adultes retournés en eau douce. Je prétends ici que Garner et al. ont surestimé les conséquences énergétiques de la consommation d’œufs et que les taux de consommation observés ne représentent pas des gains en énergie biologiquement significatifs.

Document Type: Discussion

Publication date: 2010-12-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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