Relationships between vertical migration and diet in four species of euphausiids 1

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Abstract
Diel changes in stomach weight of euphausiids showed a close relationship between the inferred increase of feeding at night and strong vertical migration in four species. Thysanopoda aequalis and Thysanopoda monacantha, species with a small percentage (4 and 13%) of depth overlap between their day and night vertical distributions (i.e. large diel vertical migration), exhibited a marked increase in stomach weight at night. Thysanopoda pectinata (39% overlap), a moderate vertical migrator, showed a constant stomach weight throughout day and night. Nematobrachion sexspinosus (56% overlap), a very weak or nonmigrator, showed increased stomach weight during the day. Increases in stomach weight at night were accompanied by an increase in fluorescence and the amount of phytoplankton remains found in the stomach, but neither was found in the species which did not show increased stomach weight at night.

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