Their moulted exoskeletons , faecal pellets and respiration at depth all bring carbon to the deep sea .
Many planktonic copepods feed near the surface at night , then sink into deeper water during the day to avoid visual predators .
copepods ' moulted exoskeletons , faecal pellets and respiration at depth all bring carbon to the deep sea .
Many planktonic copepods feed near the surface at night , then sink into deeper water during the day to avoid visual predators .