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The high concentration of adult Antarctic krill Euphausia superba Dana around South\udGeorgia, Antarctica, is a product of immigration and not local recruitment. We investigated whether\udreproduction and early larval development are the cause of local recruitment failure. It was found\udthat the majority of adult females were reproductively active in summer and that there was a comparatively\udhigh investment in the ovary, reaching up to 46% of the total wet weight of the krill. The corresponding\udegg batches were amongst the largest ever reported for E. superba. A semi-empirical\udmodel predicted that 11% of females completed just 1 spawning episode per year, 60% completed 2,\udand 29% completed 3 or more. On average, a South Georgian krill released 12 343 eggs yr–1. The\udeggs were unable to complete the descent–ascent developmental cycle on-shelf because the bathymetry\udwas too shallow but, off-shelf, they were predicted to sink to between 490 and 520 m and\udreturn to the surface either as a metanauplius or 1st calyptopis stage with plenty of energy reserves\udremaining. Feeding conditions were adequate for the development of later larval stages once these\udreserves were exhausted. Although net surveys found calyptopis and early stage furcilia in the vicinity\udof South Georgia, numbers were mostly lower than predicted. Overall, reproduction or early stage\uddevelopment are successful in this region, leaving predation on larvae and advective export during\udwinter as the main potential causes of local recruitment failure

Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae