When fish are in a closed bag they produce wastes.
Oxygen is converted to CO2
CO2 is soluble in the water, making the water acidic.
Ammonia wastes of fish make the water alkaline.
The two sorta balance, the more acidic the less toxic the ammonia.
When the bag is opened the CO2 is degassed from the water and the pH climbs and the
ammonia in the water becomes more toxic to the gills of the fish.
A bag should not be opened and the fish left in the bag, they need to be moved
IMMEDIATELY. preferably to a salt dip and then into tank or pond.

There are also other wastes in the water. When fresh (out of the tap) or tank water
is added a chemical reaction of some kind goes on that is toxic. So not only should
bags be kept closed until the fish are ready to be moved but no water should be put
into the bags they are in. adding water to the water IN the bag makes that water
even more toxic to the fish.

"Angrie.woman" wrote:
Not sure what you mean about adding new water to closed containers. I
didn't top them off, but I did swap water with the new tank water slowly
so the water would be essentially the same when I moved them.



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