Andrew, that's a big pickerel. I'd say most anglers here are targeting fish in the 18-20 inch range, with anything over 20 being a bit of a surprise, and a population with no fish over 18 being not very interesting.
Here's what the Maine DIFW has regarding pickerel/pike ID. The black bar that runs from the eye to the back of the jaw is the best sign I know.
http://www.maine.gov/ifw/fishing/species/identification/pickerel_pike.htm
Here's another that also shows muskies (another invasive here, courtesy of introductions in Quebec.)
http://www.eregulations.com/maine/fishing/muskie-pike-or-pickerel/
Here's what the Maine DIFW has regarding pickerel/pike ID. The black bar that runs from the eye to the back of the jaw is the best sign I know.
http://www.maine.gov/ifw/fishing/species/identification/pickerel_pike.htm
Here's another that also shows muskies (another invasive here, courtesy of introductions in Quebec.)
http://www.eregulations.com/maine/fishing/muskie-pike-or-pickerel/