Interesting questions StarryPearl. I love questions!
And this very morning I was watching a video with Jeremy Shepherd and Rui Gallopim about freshwater pearls and the "new FWP from China" (I actually added the video to the "News Section") and Rui asks Jeremy this same question about the "pain" and "irritation" that comes from the oysters when making pearls...or harvesting them and Jeremy and I are in PERFECT UNISON when it comes to this subject:
These mollusks DO NOT EXPERIENCE PAIN. Maybe some conchs and certainly the cephalopods could experience "pain", but pain is an actual CONSTRUCT of a brain...and if you don't have one: you can't feel it. These mollusks -for Jeremy and I- are animals that are almost "plant-like"...and plants and ALL life-forms experience something called "irritation" and they react to it. The "irritant" is anything that causes bodily harm. The creature's tissues and cells will react by secreting mucus and will try to "retreat" from damage. But because they do not have a brain...the response can actually just be limited to a small part of the body and the rest of the body is totally OBLIVIOUS to what might be happening on -let's say- the foot or mantle.
Now think about us... Humans. We can FEEL pain even if we are not being actively hurt! A bad memory can trigger it, seeing a person that has mistreated us, remembering a personal loss...there are so many things that will do it for us
So, from our perspective: oysters are "plantanimals" and we should be kind to them, never, ever mistreat them...but we should not concern ourselves too much with that feeling that we are hurting them, just like when you have a salad or an apple or banana. Enjoy and be Thankful for the fruits of Life.
In the case of re-seeding...this video is about harvesting Cortez Pearl using the "Rainbow Lip" oyster, so you can only use the oyster once (just like with Akoya oysters) since they are a short-lived species. The thing with the video is that I wanted to show you how the pearl comes out in an almost "poetic" fashion? The way pearls are extracted is totally messy and far from poetic: like squishing an egg.
So, once the video was shot...the oysters were all extracted from their shells, meat separated for sale and that was it. Not very poetic