if they are naturally used to fresh water
Salt water has a slightly higher density, so it will be a little quicker to swim in fresh water.
probally fresh because no salt in mouth or eyes addition: it is easier to float/swim in seawater since seawater is denser than fresh water.
Catfish do not swim in the ocean, they are found in rivers, creeks, and fresh water ponds.
Swim
hmm.. swim?
salt water
Fresh water with little to no chlorination.
for a simple answer,Yes
You are more buoyant in salt water than in fresh water, so it takes less energy just to stay afloat, making it easier to swim.
I don't know about health benefits, but...You are more buoyant in salt water, but fresh water feels better on the skin. salty water is the best to swim in because if your ill every year you can swim in it and you will not be ill for a year
Because there is salt in sea water and salt makes you float better so is easier to swim.
all fresh water fish