Do Conchs breed in captivity?

[Swoody]

What are these 2 up to?? If they do breed in a captive setting where do the shells come from? Might seem like a silly question but there it is. LOL There is definitely some appendage sharing going on there.

 

[JasonK84]

Not sure if they breed succesfully in captivity but as for the shell... they grow it from calcium in your system.