Preacher wrote on May 3^rd, 2011 at 2:04pm:

For the most part, accepting that the waters are relatively clean, shellfish are fine.  Something that irks even my jewish biologist pal.  As he states, "Those old rule makers had no understanding of metabolism."

I hate to get into a religious discussion on this thread but just remind your "pal" that when the orignal idea of kosher was created, there wasn't "rule makers" but only one "Rule Maker". And I'm sure He had all the knowledge of metabolism. ;) I'll leave my comments at that. :-X