These phase variations are also associated with migration at different depths (or greater depth for deep dwelling species). Indeed, it is common from late autumn until early spring to find populations in diapause close to the seafloor or at a specific depth Falk-Petersen et al. (2009) [2], Darnis et al. (2012) [3], Conover et Huntley (1991) [6], Hirche (1996) [7], Auel et al. (2003) [8] of high-latitudes oceans. Additionally, migrating at these depths should increase their survival chance by avoiding visual predation from epipelagic predators. Then, we will also assume that being at depth will reduce the mortality of the community.