John Viar from the Fish and Game posted some info a few weeks back. These are parasitic worms. But fear not the worms are only in the stomach not the flesh. I believe he said not to fear and be sure to thoroghly cook year catch.
Salmo posteda link to help prepeare your fish properly :
http://www.uaf.edu/coop-ext/publications/freepubs/FNH-00325.pdf
Also type in just tapeworm and you'll find John Viar's post
I noticed them in the fish we cleaned today from Squam. I did read the post from John Viar, but I still wonder why see did not see these at all last year and now we are all seeing them from all the local Lakes ????
John Viar also said they are not harming the growth of the fish, I'll tell you the fish we caught today certainly were plump and 100% healthy looking. But where were the worms last year ?
I suppose if Fish and Game is not alarmed, then neither should we.
If I'm not mistaken he's got relatives up this way, and just like me he's got Frenchmen in his blood LOL We're great at telling stories LOL Take Care God Bless and Tight Lines Dave!!!