The number of pilots for the bar and harbor of Charleston may not exceed the number set by the commissioners of pilotage for the port of Charleston through regulations promulgated in accordance with the Administrative Procedures Act. The number of pilots for the port of Port Royal is limited to twelve and for the bar and harbor of Georgetown to three, with power to the commissioners of pilotage to increase the number for the port of Port Royal to fifteen and for Georgetown to five, if in their judgment the commerce of either port requires the increase. The number of pilots for the other ports must be fixed by the commissioners of pilotage at the ports. However, the limit in number does not exclude a pilot who holds a regularly issued license. The board shall make no distinction in the selection of pilots on account of race, color, or previous condition.