Well, as long as they are human from waist up, I personally don't care what kind of fish tail there is. (I have about 6 mermen in my folder, and pretty sure none of them qualify as proper Nereids).
I'll lean in favor of mer then, especially when it comes to the gents.
You should upload your male portraits/bodies Ashleigh. Sure there would be plenty of people interested (and it would save creating duplicates on my part)
There is not enough to upload that would be useful to many ( I mean, since I don't do girls and definitely don't do futa, it would take a substantial amount of pictures I do not possess to make one gender-restricted pack).