Some basic facts about pikes.
They breed in the early spring after the ice melts. They find some shallow areas with weeds (they like to choose flooded shoreline) and breed there. After that, they start eating to regain lost energy and they eat much. This period is considered to be the best time for pike catch in the whole year. Try not to waste it and catch as much as possible (fishing nets in possible spawning areas can do a lot of work). But...if they manage to breed then you won't stop them easily
So, during the spring and the summer they live near weeds (shoreline and shallow areas. Bigger ones can be deeper, though). As somebody said, pike waits for smaller fish and hunts them down. In the summer they become inactive and eat not much. The best catch time is in very early mornings and late evenings. Then weather temperature lowers and this fish may try to have a little meal.
In the autumn they go deeper because of rotting weeds. The biggest ones can be found in the deepest areas of your pond. They become more active after summer break. The autumn is considered to be the best time for trophy sized pikes. The best way of catching - trolling with deep diving lures - different crankbaits and silicone lures with jig hook (mostly in lakes or larger ponds, though).
How can they be caught? They may catch any kind of lures - spinners, spoons, crankbaits, jigs or whatever. Simply find the lure that might be interesting for fish that day. One day it will like green spoon, another day little orange minnow and so on.
Fishing nets are also an option if you have possibilities to buy them. But... you may catch some LMB in them too
Bait fish is also a good idea.
How they are caught in winter? Mostly with bait fish (fishing rod with flag like this one:
http://www.nodakoutdoors.com/pike-ice-fishing101.php). If you have lots of time then you may try some winter lures. Don't forget about a leader (like fluorocarbon,for example).
EDIT: I didn't see that flag in one of the first pictures...
Hope that it helps a bit.
