うようよ

adverb, noun or participle which takes 'suru'

in swarms; crawling with

Describes a large number of small creatures (insects, fish, etc.) moving or gathering in a wriggling, teeming manner. Often used with いる or する.

• 池いけにボウフラがうようよしている。

  The pond is swarming with mosquito larvae.

• 腐くさった肉にくにウジがうようよわいていた。

  Maggots were crawling all over the rotten meat.