John, NH, Pickeral are a member of the Pike family of fishes. They like cooler temperatures than bass & are often deep like Pike in the summer. However, here on the NYC reservoirs, we generally have about a 25 ft thermocline in the summer & they will often be found suspended at that depth. Come fall & they come shallower as the water cools. This year we had real weird weather with a LOT of rain, so patterns for bass & pickeral were not very stable. In more oxygenated waters like the St Lawrence River, you can catch Pike to about 60 ft. Each body of water can have different Oxygen & PH levels which will effect the depth of the fish. One reason you used to catch Big Pickeral by the Catskill outlet on Kensico was because of the Colder & better oxygenated water there. That also drew the baitfish.
They now have it buoyed off so you can`t get close to it.
As to eating, Pike & Pickeral are tops for fresh water fish. Most people don`t eat them because they do not know how to filet them. Lots of bones, but if fileted correctly, you will not have a single bone to pick out. You can probably find "how to filet Pickeral & Pike" on the internet. Marty