[ShadowAce]

A change in the environment in one location does not translate to a change in every similar environment on the planet.

So it would be easier for a fish to walk on land than swim to a different locale?

[Dimensio]

So it would be easier for a fish to walk on land than swim to a different locale?

If it could swin to a different locale, it would be easier to swim there. Of course, perhaps those better adapted for movement on the surface later migrated to environments different than those of their ancestors, thus further enhancing the desirability of that particular trait.