The type of homeostatic mechanism that this species is using to regulate its internal salt levels is conformation.
Explanation:
A conformation homeostasis can be described as a type of homeostasis which occurs in the bodies of an organism which live in an environment for a long period of time. In this way, organisms do not have to make much effort to maintain homeostasis in that kind of environment.
For example, the bacterial which lived in high salt conditions changed its internal conditions according the environment.