with regard to barbel on pole,if the hook, line,elastic ,and pole are up to it the fish will apply it,s own pressure and tire itself out,far quicker than some of the nerds you see.as regards how long you should play a fish,all fish have a central core of "red" muscle that is only used to flee from danger,and an outer layer of white muscle that is used for day to day swimming about,the ratio varies with different species.after prolonged use of red muscle the build up of lactic acid causes a breakdown in functions ,mainly breathing.therefore the sooner the fish is landed the better.