- Nov 5, 2009
- Central Maryland
I don't see any difference. Both are migration via human agency.We didn't unleash cattle into the wild to displace native cattle.
We weren't introduced, we migrated.
There's a very metric here in MD about whether a watershed holds brook trout in their native range; it has nothing to do with brown trout: if it has less than 3% non-permeable surface (roads and roofs) it still has brook trout, if greater than 3% it doesn't. Humans are a far bigger threat to brook trout than are brown trout, and it makes no sense to not have wild brown trout in those drainages where the non-permeable surfaces take up more than 3%.
Out west, they wish brown or rainbow trout would displace brook trout. They can't get rid of them.