Abstract
Samples of Euphausia superba larvae at the Calyptopis I stage, taken in the upper 200 m near South Orkney Islands, have been analyzed discriminating early and advanced substages on the basis of the presence or absence of pleon segmentation, evidenced through the actual cuticle. A significant difference in pleon length between these forms is demonstrated, suggesting growth between them. Results show no difference between these in relation to their vertical distribution; supporting the view that developmental ascent has been already completed in the area. In both substages, a significant difference between night and day catches existed, but no evidence of diel migration was found in their vertical distributions.
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