15The aim of this study was to determine the influence of different levels of 16 dissolved oxygen (DO) on embryonic development (ED) and hatching success of 17Greenland halibut (Reinhardtius hippoglossoides) eggs. Fertilized eggs from six 18 females were exposed to five DO levels: severely hypoxic (10 and 20%sat 19[percent saturation]), moderately hypoxic (35 and 50%sat), and normoxic 20 (100%sat). Greenland halibut eggs were highly tolerant to hypoxia, with hatching 21 occurring at levels as low as 20%sat. In severely hypoxic conditions (10%sat), ED 22 future. Other species that share similar life histories may also be at risk. 31 32