Doubtless they cast them into their rivers, or pits, &c., though that be not here mentioned. God would not instantly and wholly take them away, both to convince them of the truth of the miracle, and to make them more sensible of this judgment, and more fearful of bringing another upon themselves.
Related Commentaries of Exodus 8:14
Exodus 8:14
14 And they gathered them together upon heaps: and the land stank.