Maria Christine : Note my location, though I am actually less than 1 hour away from the St. Lawrence Seaway, we have seen no sign of this issue YET !
I will look at the Cornell site for information on composting Zebra Mussel shells!
Do I understand that you are feeding the shells to the
chickens as a mineral type supplement to increase the value of the
chicken do-do ?
Well cleaned oyster shells have been traditionally supplied to domestic flocks of those birds prized for egg production. Coarsely ground oyster shells
are pulverized by passing through the birds 'Crop' and are internally recycled to make the bird eggs hard outer shell
Also the mussel shells would naturally be useful used as 'Grog' to be mixed in with Pottery Clay to reduce the internal rate of shrinkage and crack
formations leading to failure of the Pottery ! Clarification of this traditional use
should be not more than a "Search' under Grog away !