zooplankton

English Thesaurus

1. animal constituent of plankton; mainly small crustaceans and fish larvae (noun.animal)

hypernym	:	animal, animate being, beast, brute, creature, fauna,
definition	:	a living organism characterized by voluntary movement (noun.tops)

member meronym	:	plankton,
definition	:	the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water (noun.animal)