Abstract
Bait (100 g of mackerel), moored 20 m above bottom at 5830 m in the Nares Abyssal Plain, northwest Atlantic Ocean and photographed at 10 min intervals, was completely consumed by scavenging lysianassid amphipods ( Eurythenes gryllus) within 38 h. An average feeding rate of 1.8 g amphipod −1 h −1 was calculated from the total number of amphipods counted in photographs and the time required for complete consumption of bait. Amphipods were present as single individuals during 12 h after the first animal arrived with an average residence time of 30± 10 min. Weight loss, calculated from changes in bait volume observed in photographs during this period, indicated an average consumption rate of 2.9 g amphipod −1. Amphipods of different sizes ingested from 30 to 60% of their body equivalent weight and then departed from the bait. These are the first in situ observations that permit calculation of feeding rate for any deep-sea animal.
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