There should be moki around all year, but around August they spawn around Gisbourne.
August-September in Gisborne.
June-July and September-October at Napier
September-October at Wellington
May-June and October at Kaikoura
So according to this data the next couple of months should be the prime moki fishing time.
[quote:5hue3r3l]The fish make an annual spawning migration, swimming north from Kaikoura in May-June, reaching Gisborne to spawn in August-September, and then swimming south, passing Kaikoura again in October.