Created in openSCAD for the fish contest.
There are two stl's one has a base and one does not. The one without a base is best, it stands upright when printed, but it does require good table adhesion. The second file, with a base is probably easier to print.
It prints with 30% support just fine. Needs no more than 10% fill, though more doesn't hurt it.
The final stl's have a few edits beyond the photo's of the printed green one. But they may not even be noticeable; slightly redone head and some slightly different tail texture.