When I was researching an article for shad fishing on the Umpqua, I found that shad are a big deal game fish on the east coast ... so much so a gentleman brought barrels and barrels of the American Shad to California and dumped them in the Sacramento ... he thought he was doing the western anglers a favor.
Then the shad went nutso and started invading warm rivers that flow into the Pacific... one is the Umpqua, another is the Siuslaw and what I've heard from fish biologists, chances are they are setting up digs in many other rivers ... we just don't know it... yet.
So we're stuck with them. Do they have an effect on the native species? Hard to tell. Usually a river that is warm enough to support shad also supports bass and the like so there you go. Lots of non-native fish in the rivers.
Then the shad went nutso and started invading warm rivers that flow into the Pacific... one is the Umpqua, another is the Siuslaw and what I've heard from fish biologists, chances are they are setting up digs in many other rivers ... we just don't know it... yet.
So we're stuck with them. Do they have an effect on the native species? Hard to tell. Usually a river that is warm enough to support shad also supports bass and the like so there you go. Lots of non-native fish in the rivers.

