(b) receiving authorization number and (c) updating log book. - Due Diligence - East coast halibut fishery - Offences - Removing fish from vessel prior to (a) contacting Fisheries Resource Centre R v. Howell In Due Diligence, Fish Cases, Offences on November 17, 2015 (Updated November 17, 2015) A due diligence defence was not established, as writing down catch numbers on a piece of cardboard does not constitute due diligence.