Each marker is considered its own entity as far as being launchable is concerned. If you have a Dictator you can launch 4 AC markers, each of strength 1, and 1 torpedo marker with a strength of up to 6. Whatever you decide to fire is expended. Whatever you don't fire is still loaded. So if you fire 2 torpedoes, say, to fit the salvo through a narrow gap in your lines, then your torpedo marker has been expended and it requires a reload order to be able to fire your torpedoes again.
Both these issues (the holding over of AC and the inability to hold over torpedoes) have been ruled upon by the HA a long time ago, not that I could be bothered looking for the rulings.
However, there are some common sense considerations that confirm this ruling to a degree. Firstly, a Dictator that fires its torpedoes in one turn could not possibly have to RO in order to launch its AC. This would be ridiculous. By extension a carrier that launches from its port bays only should certainly not need to reload again before launching from its starboard bays.
As for the rule which says that when a ship has launched its ordnance it must RO before launching again, this strongly implies having launched all its ordnance. For example, the ordnance complement of an Emperor BB is 8 AC. So once it has launched its ordnance (8 AC) then it must reload before launching again. While it still has AC then it hasn't yet launched its ordnance complement.
Again, torpedoes are launched as a single marker, of variable strength. A single fighter can take out a single torpedo marker, whether it is a strength 1 or 27.