I think the white just Shows up more. I do agree it's getting to the time of year that they just shed more. I've noticed an increase in shedding for HRH and she does get a fish oil capsule every day.
Wilson's also been shedding a bunch the last few weeks. I finally bite the bullet and got the Furminator to brush him with and it works wonderful. Never thought I pay that much to brush my dog with though and wish I would have gotten it long ago for my other short hair dogs. Wilson's coat is also thick.
On a side note, he's been off the Salmon Oil for about 6 weeks now and I've noticed a big difference in his shedding. I have more on order now and got a smaller bottle so it doesn't go rancid.
My two shed so differently, both are on fish oil (2400mg per day). Banks, female and white/brindle markings barely sheds at all.... Nitschke, male red/white sheds ungodly! We use the furminator, which helps, but I swear his coats is the thickest I've ever seen