We here in Chicago/Illinois/Midwest/GREAT LAKES AREA, have been dealing with this for quite a while now with the Zebra Mussels. For us, there have been some GOOD, as well as bad, repercussions from the invasive mussels, and GOBYS as well (Asian and Bighead Carp: ALL BAD!) . The whole 'Ocean Going Ship's Bilge Water Issue' should have been addressed DECADES ago,and the indusrty cry of: "but it's cost prohibitive", has and will continue to cost, EXPONENTIALLY, far more than any preventative/protective programs ever would have... The biggest problem with invasives is that almost NOTHING can stop their spread once they are in a waterway, and a biologic and environmental snowballing effect results. If it's not boats, it WILL be a bucket, a reel, someones boot, they will spread if we, as people (hikers along shorelines,BIRDS and ANIMALS, not just fishermen), are moving from one stream/pond/lake/resivoir to another. They WILL spread, the RATE at which they spread IS something we can hopefully affect. I WISH and HOPE all the best on this issue for you guys, as there are MUCH bigger forces out there than 'sportfishermen' that will drive this issue to a TOTAL ban on boats on your California fresh waters (saltwater is their NEXT target (AGAIN)... re:Marine Sanctuaries...etc.) I found this link to help explain some of the issues and basic info. http://www.parks.sfgov.org/wcm_recpark/marina/QuaggaQA.pdf I had REALLY hoped to come out there this year and fish these famous lakes, from a boat... GOOD LUCK TO ALL OF US! (once the Hyper-Left,Hollywood,PETA,etc. get a hold of this, I fear "the boat is sunk" ...... THANKS RICH for being the "POINT" on this and letting folks know... Be Well, Alex