> Krill lost 50% of their habitat in the last 60 years. Not necessarily. Krill species live from surface to fairly deep waters. Surface is an important, but s

> Krill lost 50% of their habitat in the last 60 years. Not necessarily. Krill species live from surface to fairly deep waters. Surface is an important, but small part on its entire habitat. We need to take in mind that all in this study is about the situation found when sampling an area between 0-10m deep. For Thysanoessa for example this means that if you don't find them at the surface there is still a 390m deep layer where they could still be located. Meganyctiphanes, Nematobranchion and Thysanopoda concentrate normally in waters below 400m by day (Saunders et al, 2013). They can migrate to surface [1] at night, but can also choose to remain close to the sea bottom in much deeper areas. It depends a lot on the species, location and time of the year. [1] More or less, surface does not mean 0m necessarily, can mean -15m or -20m also.