1841 Census should read "Shellknowe, Ballantrae" and being Saltcoats bred myself "Panbrae" in the 1851 Census I know to be an extension of Quay Street.
Coincidentally, my paternal grandmother's family (MURRAY) also resided in Quay Street at the mid-late 1800s & she married a McCREADIE from another line of this same family.
A great-white in North Atlantic waters? I'd have thought it too cold for them but then I'm no fishologist