How do you acclimatise tilapia in marine water?

Answer 1

Tilapia are typically raised in freshwater though they are used to harder (higher calcium) water. They were acclimated to less hard water for the fish farming industry. Tilapia can be acclimated to saltwater but most likely, they will not breed or grow as large in saltwater.

To acclimate fish to saltier water, you must raise the saturation of the fresh water by adding sea water to the tank that the fish you want to acclimate. Black Mollies, typically a fresh water fish can be acclimated by dropping about a 1/2 or less tea spoon of clean sea water once a day until the tank they are living in becomes near 100 sea water (assuming the the Black Mollies are in a 20 gallon tank). For Tilapia, in my opinion, would be more sensitive so more care and less saltwater should be added per day. If the fish is a grown, then it should be done even slower.

With that said, there is no reason to acclimate Tilapia to sea water.