Abstract
The growth of many organisms is seasonal, with a dependence on variation in temperature, light, and food availability. A growth model proposed by Somers (Fishbyte 6:8–11, 1988) is one of the most widely used models to describe seasonal growth. We point out that three different formulae (beyond numerous typographical errors) have been used in the literature referring to Somers (Fishbyte 6:8–11, 1988). These formulae correspond to different curves and yield different parameter estimates with different biological interpretations. These inconsistencies have led to the wrong identification of the period of lowest growth rate (winter point) in some papers of the literature. We urge authors to carefully edit their formulae to assure use of the original definition in Somers (Fishbyte 6:8–11, 1988).
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Acknowledgments
We thank Luis A. Cubillos for sharing the anchoveta data and Professor Daniel Pauly and an anonymous reviewer for helpful comments. Financial support for this research was provided by the Spanish Ministry of Science (projects CGL2009-12877-C02-01 and Consolider-Ingenio 2010 CSD2009-00065). GCC and RM held doctoral fellowships, from the University of Girona (BR2010/10) and the Spanish Ministry of Education (AP2010-4025) respectively, during the preparation of the manuscript.
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García-Berthou, E., Carmona-Catot, G., Merciai, R. et al. A technical note on seasonal growth models. Rev Fish Biol Fisheries 22, 635–640 (2012). https://doi.org/10.1007/s11160-012-9262-x
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DOI: https://doi.org/10.1007/s11160-012-9262-x