WHEN BAKING PUT THEM ON A RACK TO ALLOW THE NATURAL JUICES A PLACE TO GO.

The liquid is from the fish.
I find baking tends to dry out the fish, generally fry them only for a few minutes each side using a little butter in a non stick pan.
I have been using the microwave with variable result.
The liquid can be flavoured with lemon, lime or vinegar and drizzled over the top.

What I do is that before seasoning i wrap the fish in a dry paper towel for about 2 minutes. That soaks out the moisture to a certain degree.

Also, I dust the fish with a little flour, that makes it crispy and keeps the moisture inside.

Put the fish on a raised cookie rack….you know the rack to cool cookies. You might need to use a couple if the fish you use emits a lot of liquid. Don’t forget to spray the rack with non-stick spray first!!