The rāhui, which included netting, customary fishing and gathering kai moana, was signposted at all boat ramps in the area and publicly notified.
It was supported by hapū from Taumarere to Rāwhiti.
Rewiri said the rāhui was not legally enforceable but most people respected it.
"It is part and parcel of honouring our traditional cultural practices. We didn't fish all year. There were periods of time when our tūpuna would let the sea rest like they'd let the bush rest."
Kororāreka residents were good at keeping an eye on what was happening on the water around their town.
"If someone is fishing they will go and talk to them, and offer a friendly, non-official explanation with the rationale behind the rāhui."
Rewiri said the breeding-season rāhui was already having an effect, despite being in effect for only four years.
Long-time Russell residents said marine and bird life had improved dramatically in that time, with fish numbers increasing even around Kororāreka wharf.
She hoped the customary ban could eventually be expanded to include the Middle Ground, a popular fishing area off Tapeka Pt.