Nitrofreak

In the summer , it's difficult to tell , there may possibly be a thermocline or something else making the fish suspend , but with heavy boat traffic the water stays churned up on a more than regular basis , chances are , the fish are just being stubborn and you need to slow your presentation down some , the best thing about docks is you can pick then apart , they may be on an outside post , they may be way under the center , more often than not , with docks a pattern may develop , pay attention to where your strikes come , the wind , current , all play a part , keep duplicating what you find to be productive in a given area if this happens , older docks hold more chances at locating good fish , older docks in most cases will have algae which aids in attracting bait fish , on bright sunny days look for docks or parts of docks that cover a large portion of water for the most available shade , fish will hold tight , really tight to cover on bright sunny days and you must be precise , overcast days they will loosen from that cover and you may find them on the outer edges of the docks .
 
Good luck and be safe !!!