Imamat 11:10

11:10 But any creatures that do not have both fins and scales, whether in the seas or in the streams, from all the swarming things of the water and from all the living creatures that are in the water, are detestable to you.

Imamat 11:31

11:31 These are the ones that are unclean to you among all the swarming things. Anyone who touches them when they die will be unclean until evening.