Lake Michigan salmon numbers are way down from what has been the norm for the past 50 or so years.
It's going to be interesting (I fear not in a good way), to see what
effect the reduced salmon numbers are going to have on the resident
trout/bug populations over time. If a butterfly fluttering it's wings
can cause a hurricane, what happens when you remove a couple million
thrashing salmon tails.
In alot of respects, one might view a salmon as a semi truck, filled
with biomass, making a delivery from the big lakes to consumers
upstream. They provided tons (literally) of food in the form of roe and
flesh to the resident populations every fall. That gave all the
residents a chance to fatten up for the cold winter ahead.
If over time there aren't so many, if any, semi trucks delivering the
bacon, it could mean lean times for river residents getting ready for
I hope not, but of course, we'll see (whether we want to or not).
p.s. As I think about it, the big lake sourced feed bag continued well
into the spring/early summer with massive numbers of hatching fry.