Meromixis

On the other hand, at least in a really deep tropical lake it is supposed that once thermal stratifiction is established it will be so quickly stabilized by chemical products of the lake's metabolism that meromixis will ordinarily ensue.

The crenogenic type of meromixis is characterised by a chemocline which lies at such a depth that as much salt water is mixed from its surface in unit time as enters the monimolimmion at that time.

Meromictic lakes are the result of meromixis, ...