As in Ward et al. (2012, 2014), the internal nutrients pools are regulated following the quota approach (Droop, 1973). In his papers, Ward et al. used size-dependent maximum and minimum nitrogen quota for the phytoplankton (Ward et al. 2012). By doing so they would emulate the trade-off between size and absorption efficiency in the phytoplankton. On the other hand, they used fixed quotas for the zooplankton because at some point the size-dependent relationship would have gave unrealistic quotas. Following the same direction, we gave fixed nitrogen quota for the copepod-like metazoans. To be able to reproduce the wide variation of lipid concentration (and hence C:N) found in arctic copepods we gave respectively a higher and a lower maximum and minimum nitrogen quota (Table 1). In order to reproduce the lipid accumulation, we needed also to change the nitrogen excretion parameters.