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Only asked for robots.txt, which is fortunate, as I have all Nutch bots barred. ;)
From their About Us: "Bigsearch.ca is a search engine seeded from the dmoz.org directory. Bigsearch.ca uses open source technologies to create an open and fair index."
I have now tried disallowing it in robots.txt using "Bigsearch.ca" - this is just a wild guess, as their web site gives no clue if it obeys robots.txt or what User Agent might be required. I'll see what happens if they return.