clam's opening


New member
Hello all, I'm not sure which opening the opening that im talking about is. But its the one thats a whole, and not the tube sticking out of the clam. (Not sure if its the inhaling or exhaling, but you know which one im talking about now). Well I've noticed on my gold maxima that the size of it varies day to day, its not gaping at all, but just wondering what causes the varying sizes. Thanks