weapons and armour of the greek marine

[Giannis K. Hoplite]

Maybe my post was a bit confusing.I said I think most of the archers on board would have been citizens. So we don't disagree. But if archers were citizens in Salamis(your example) this does not necessarily mean this was the case in the Peloponnesian war,thus Salamis is not a good example for the organization of the Athenian navy 50 years later.
In other words,Herodotus does speaks only for persian marines when saying they were not able to swim. But this does not rule out later on the greeks used Skyhian archers.
Khaire
Giannis