A macro-zooplankton study from 1996 wasrepeated in 2006 and focused on euphausiid species asindicators of advection and warming effects in Kongsfjorden,West Spitsbergen, Svalbard. The influence ofwarmer Atlantic water in Kongsfjorden was indicated bythe findings of three additional euphausiid species oftypically Atlantic origin, relative to the previous study10 years ago. The predominant presence of Thysanoessainermis in Hornsund suggested persisting cold conditionsin this more southerly, but more Arctic influenced fjord. Inthis species, moult stage analysis showed that trophiceffects can override temperature forcing. Histology andlipid analysis suggest that reproductive activity should bemonitored as an indication of warming and possibly a shiftin food web composition.