The award-winning Peter Greste is on trial with 19 co-defendants, including five Al-Jazeera journalists, for allegedly defaming the country and ties to the blacklisted Muslim Brotherhood.
Today's hearing coincided with World Press Freedom Day.
"We recognise the significance of the coincidence of this trial falling on World Press Freedom Day. This is a very clear message," Greste said from his caged dock at the court in Cairo.
Greste, a Peabody Award-winning journalist who previously worked with the BBC, also branded the trial "a massive injustice, regardless of the outcome".
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The Al-Jazeera journalists in the dock along with Greste are the Qatar-owned broadcaster's English channel Cairo bureau chief Mohamed Fahmy and producer Baher Mohamed.
Their trial comes against the backdrop of strained relations between Cairo and Qatar, which supports the Muslim Brotherhood movement of deposed Islamist president Mohamed Morsi.
It has sparked an international outcry and calls for the release of the journalists, while Cairo insists the trial does not presage a wider crackdown on journalists.
In a letter from prison on published yesterday, Mohamed Fahmy said he was on trial for only doing his job.
The judge today adjourned the trial to May 15.