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Lake Superior not only has some of the best wreck diving in the world, it has very few zebra mussels compared to the other Great Lakes. Anyone wanna give a good explanation as to why this is? And before you say that the water is "too clean" or "too cold," consider that even the scientists don't know, but the low Calcium levels in the water may be part of the reason for the inability of zeebs to thrive in Superior. I have seen shallow wrecks (less than 60 ffw) in Lake Michigan become smothered with zeebs, beginning around 1995, obscurring engine details to the point of making the wrecks undesirable to dive. Deeper wrecks are relatively spared, but even depth doesn't stop zeebs or their relatives (Quagga mussels) from latching on. Improved visibility from these filter feeders is often exaggerated by divers, but there is no question that water clarity has improved wherever zeebs have taken hold, some consolation. While a few harbors, like Duluth, are beginning to develop a problem, it is fortunate that nearly all the preferred wreck sites in Lake Superior, like Whitefish Point, Isle Royale, Munising, the Keweenaw Peninsula, and the Apostle Islands, have been spared of zebra mussels so far. Hooray for Gitchee Gumee, the best of the best! May you stay that way forever. MJB __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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