Demonstrations have been held at ports in Tauranga and Wellington in support of Auckland port workers.
More than 300 members of the Maritime Union are on strike for four weeks as they try to negotiate a new collective agreement.
About 60 people, mainly union members, carried out a picket at Centreport in Wellington from Friday night until about midday on Saturday and up to 30 people did the same at Port of Tauranga.
The pickets coincided with the arrival of ships that were processed in Auckland by non-union employees.
Maritime Union general secretary Joe Fleetwood says the demonstrations were a show of solidarity.
Demonstrations resumed on Saturday evening.
Mediation over a collective contract during the past two days between the Ports of Auckland company and the Maritime Union ended in a stalemate.