Pier fishing is fishing usually from piers on the beaches or in harbors and marinas among ships, boats, yachts... It can be done using rods or as form of hand-line fishing. Size of fish vary, but fish sometimes can me surprisingly large - usually one can hope for pan size specimens. Fishing is done on or near surface (using various rigs with floats) or on or near bottom, using various sinkers.
Note: eating fish that spends plenty of time in harbors and marinas is not always recommended since quality highly depends on quality of water. Also, not all harbors and marinas allow fishing, so be sure to check these details.
Fishing piers are piers made just for fishing - no boats and similar obstacles that can hinder your fishing. Height from the surface of these piers vary and depends on tides. In areas with high tidal difference, floating fishing piers are in use. Sea depth is limited, except, again, where floating fishing piers are in use.
Fishing licenses for such piers are often purchased on daily basis or even one pays per hour.
In season of fish migrations, these piers can be very crowded, to say the least.
Pier Fishing Tackle
Pier fishing tackle is usually medium length rod with general purpose reel and some 8-15kg (game fish dependent) strong line. Length and action of rod depends on the casting distance and used rig.
Fishing can be done on or near the surface (mullets or some predatory species lurking for small mullets and similar small fish near surface) or on or near the bottom - these species vary greatly, depending on the area, season, weather etc.
On sandy bottoms, trolling can be done even directly on the sand - this is great way to catch species that feed by digging around.
Pier Fishing Lures and Baits
Lures are used when trolling using rods and reels - if pier is crowded or if there are boats around, this type of fishing is not recommended, especially if you are trolling using live small mullets - they will always find the way to get into the ropes or other fishing lines - been there, done that :)
Baits should be local - if there are plenty of, for example, mussels on the piers or rocks around, then mussels are great bait for local fish already used to mussels. Live or dead prawns are often used and various other crabs and worms.
Ordinary bread or paste made from flower, cheese, canned fish (sardines, mackerel etc.) can be great bait for many fish species found in such areas.