What happened to the Athenians who were taken as prisoners in the peloponnesian war

Various fates – eg the ones talen prisoner at Syracuse were sold into slavery or died in a prison pen in a quarry; the wealthy were sometimes ransomed; some escaped; those taken at the final sea battle at Aigospotomai had their throats cut as they had bragged beforehand that they would cut off the hands of all the opposing sailors. No Geneva Convention then.