In 2013, Hiku (and long time Marlins and Warriors teammate Ligi Sao) left the Warriors and joined Sydney NRL club Manly Warringah Sea Eagles, playing mostly at fullback for the Luke Williamson-coached Sea Eagles New South Wales Cup team.
In Round 6 of the 2013 NRL season, Hiku made his NRL debut on the wing for the Sea Eagles in place of the injured David Williams against the Cronulla-Sutherland Sharks at Brookvale Oval, scoring a try on debut in Manly's 25-18 win.
In his first game of NRL finals football in the 2013 season, in place of an injured Brett Stewart, Hiku was judged as man of the match despite Manly going down 4-0 to the 2013 minor premiers the Sydney Roosters at the Sydney Football Stadium.
Hiku ran for a club record 297 metres on the night.
Hiku later backed that up by running 231 in the following week's 24-18 semi-final win over Cronulla-Sutherland Sharks at the SFS.

Stewart made a surprise return from injury in the preliminary final win over South Sydney and Hiku was considered unlucky to miss a place on the bench both against Souths and in Manly's grand final team which lost 26-18 to the Roosters.
Hiku finished his debut year in the NRL as a “Mr Fix It” type player, mostly filling in for the injured Brett Stewart, playing in 13 matches and scoring 3 tries for the Manly-Warringah Sea Eagles in the 2013 NRL season.
In 2013, Hiku (and long time Marlins and Warriors teammate Ligi Sao) left the Warriors and joined Sydney NRL club Manly Warringah Sea Eagles, playing mostly at fullback for the Luke Williamson-coached Sea Eagles New South Wales Cup team. In Round 6 of the 2013 NRL season, Hiku made his NRL debut on the wing for the Sea Eagles in place of the injured David Williams against the Cronulla-Sutherland Sharks at Brookvale Oval, scoring a try on debut in Manly's 25-18 win. In his first game of NRL finals football in the 2013 season, in place of an injured Brett Stewart, Hiku was judged as man of the match despite Manly going down 4-0 to the 2013 minor premiers the Sydney Roosters at the Sydney Football Stadium. Hiku ran for a club record 297 metres on the night. Hiku later backed that up by running 231 in the following week's 24-18 semi-final win over Cronulla-Sutherland Sharks at the SFS. 
Stewart made a surprise return from injury in the preliminary final win over South Sydney and Hiku was considered unlucky to miss a place on the bench both against Souths and in Manly's grand final team which lost 26-18 to the Roosters. Hiku finished his debut year in the NRL as a “Mr Fix It” type player, mostly filling in for the injured Brett Stewart, playing in 13 matches and scoring 3 tries for the Manly-Warringah Sea Eagles in the 2013 NRL season.
Peta Hiku