6. FOOD AND FEEDINQ
181
upwards and backwards from the bottom and commences filter-feeding
on the suspension. In the second method, it approaches the bottom a t a
lesser angle (Fig. 64) and ploughs up the surface layers with the
antennae. When it has accumulated a lump of material it rises slightly
from the bottom, and suddenly spreads the thoracic limbs so that the
..
. ..
. . * '
FIQ. 64. Euphausiids feeding on detritus. Above, lifting bottom material into suspension
by producing water currents with the pleopods. Below, moving along the bottom
ploughing up material which is retained between the thoracic limbs and the mouthparts.