I was looking for a file to calibrate my printer for TPU.
But since I had problems with small overhangs, I used the fin from the original file as a tail fin, so I could also simulate small overhangs. Furthermore, I had problems with the retract values and wanted to try out what small areas look like, so the fins were changed. It shouldn't be a problem to print the fish without infill.
In my case this was a great test object, have fun with your experiments.
The author remixed this model.
I adjusted the height of the file, added a pattern to the fins and changed the tail fin.