I have had good luck with fish pictures by pressing the front of the lens barrel up against the glass.
This blocks out reflections that the glass will cause and it also holds the camera very steady.
If it is a small curved glass bowl, make sure that the glass lens does not actually touch the glass. You could scratch the lens.
If the fish are in a small container, you will have to use the "macro" feature on your camera so that you can "close focus".
If you have to take a photo with the camera lens away from the glass, the camera just may try to focus on the glass instead of the fish behind it. If this occurs, just point the camera at something nearby that is the same distance as the fish; press the shutter button half way down. Then swing the camera back to the fish and press the shutter button the rest of the way down.
Never try to take a flash picture of anything behind glass as you will end up with a great shot of your reflected flash. However if you have the camera lens pressed against the glass, you can use flash if necessary.
New girl on the block.
I have a HP 3.5 (i think) and it takes great pictures of family pets etc ... but, how do I take clar pictures of fish? Yeah, things in water it doesn't capture so well, everything comes out very blurry.
I use a lot of light, don't zoom, use the action settings and all that jazz, but still it doesn't come out nice.
Please help me