I made some Salmon & Cod Mob Statues at both a 1 pixel : 2 block and a 1 pixel : 4 blocks scale. The 1:2 scale is the one I usually build my mob statues at. At the 1:4 scale the fins don't look as bulky.

You can find schematics for LiteMatica and WorldEdit as well as worlds with all statues in the download.
Feel free to download and use the statues however you like, but please give credit if you do :)

Check out my Mob Statue Collection for more builds like this!