When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt.
Because objects float better on a dense surface, they float better on salt water than fresh water. The denser the salt water, the easier it is for objects to float on top of it.
with its tail
Yes.
Salt water is denser that fresh water, so a swimmer (and ships) float higher in saltwater.
Obviously, since they are fish they will swim but Guppies (Lebistes reticularis) are freshwater fish and will die shortly after being placed in saltwater.
they usualy swim fast in both waters.
Yes.
predicting would it be easier to control saltwater or freshwater blooms explain
Because saltwater is more dense than freshwater.
Depending on the type of eel, yes.
no but it can swim out to sea, try google
that a mamba doesent swim.....i think
In the Ocean, no it wont. However, in a saltwater pool that is'nt cleaned often, the algae can grow in your hair and turn it green.