Subject: Why don't anadromous fish suffer inbreeding depression?

So, anadromous fish (e.g. Pacific salmon genus Oncorhynchus) return to 
their "home stream" to breed.  But aren't their potential mates also from 
the same home stream and hence likely to be close relatives, spawned at 
the same time as all other returning maters?  Hmmmmmmm.......

Re: Why don't anadromous fish suffer inbreeding depression?