Jackson Hyde first appeared in Brightest Day (DC, 2010 series) #4 (Late August 2010).
It was revealed in Brightest Day (DC, 2010 series) #10 (Late November 2010) that Jackson Hyde was Black Manta's son, however Hyde was the surname of Jackson's adoptive parents and not Black Manta.
Cameo first appearance as Aqualad (unnamed) in a flashforward in Teen Titans (DC, 2003 series) #88 (December 2010).
Origin revealed in Brightest Day (DC, 2010 series) #16 (Late February 2011); his name was given as Kaldur'ahm in this issue.
Jackson first donned a costume in Brightest Day (DC, 2010 series) #16 (Late February 2011); he was never explicitly referred to as Aqualad in the stories in this continuity.
First appearance of Jackson Hyde in DC Rebirth continuity in DC Universe: Rebirth (DC, 2016 series) #1 (July 2016).
First appearance in costume in Teen Titans (DC, 2016 series) #8 (July 2017).
DC Rebirth origin revealed in Teen Titans (DC, 2016 series) #10 (September 2017); this revamp retained Black Manta as Jackson's birth father but eliminated the adoptive parents from his backstory.
He was given the codename Aqualad in Teen Titans (DC, 2016 series) #11 (October 2017).
Jackson Hyde became Aquaman in Aquaman: The Becoming (DC, 2021 series) #6 (April 2022).
Young Justice cartoon:
Aqualad (Kaldur'ahm) was introduced in the Warner Bros. animated television series, Young Justice, season 1 episode 1, "Independence Day", on November 26, 2010.
First official appearance of Aqualad in a comic book in Young Justice (DC, 2011 series) #0 (March 2011). Previews for this issue appeared in a number of DC comics the previous month, with Scooby-Doo, Where Are You? (DC, 2010 series) #4 (February 2011) and Tiny Titans / Little Archie (DC, 2010 series) #3 (February 2011) being among the earliest.