It would dehydrate and most likely die.
Saltwater eggs are given the name for a reason. They will live only in saltwater and will die right after you put them in fresh water.
If a saltwater plant were placed in freshwater aquarium then the plant cells would burst. This is because the salt water would make the plant cell allow more water to come in.
Wade O. Watanabe has written: 'Experimental rearing of Nile tilapia fry (Oreochromis niloticus) for saltwater culture' -- subject(s): Cichlids, Tilapia, Fish-culture
It is gonna sink as the non woody plant cannot float.It is also gonna spoil as it is placed in saltwater.
Osmosis
Saltwater kills most plants.
it dies
Water will leave the egg
Copper will act as an oxidizing agent. Chromium will be oxidized.
nothing will happen it will be like clean water
Tilapia are freshwater and are raised commercially in ponds.
Obviously, since they are fish they will swim but Guppies (Lebistes reticularis) are freshwater fish and will die shortly after being placed in saltwater.