I really do love going back though my piles of doodles. Man what the hell was going on here?
You'll notice a lot of my doodles and drawing are heavily aquatic sometimes. That comes from years of studying and working as a fisheries biologist. This set was draw on the back of deck form. As an onboard fisheries observer you were issued data deck sheets that were printed on plasticized paper. Some of the forms had blank backs for notes and tallies. They also make great doodle pages since they take and hold graphite so well.
I'd probably date the page sometime in the early 2000's, maybe 2001-2003.