Originally Posted by
cjworkman
http:///forum/post/2678766
It's really hard to tell sometimes.
the easiest way to decide is how much time it spends under the sand.
My nass's only come out during feeding and stay buried the rest of the time.
Whelks are much more active above sand.
Ditto. If he is mostly buried in the sand and only comes out to eat, likely a nass. If he is on the glass and rocks mostly, likely not....unless your not feeding your nasses. They are pretty hardy eaters.