so i was in the dnr office getting new stickers for my boat and noticed a paper on zebra muscles. it stated they have been found in the upper bay and went on to say they were the end of the world. but after talking to someone i find really knowledgeable and reading up on them i have to say im kinda glad to see them. from what i understand they might clog some pipes and valves but other then that its all good news for us. the water will never clean up its clarity like the great lakes did due to the nature of the bays flow , run off and building pratices in the watershed, its a new food source for divers and seaducks since the supply is suffering. and you can eat them if you so choose. i guess what i am asking is what am i missing why are they SO bad?