Recreational fishers around the Coromandel Peninsula were fined about $4000 over Labour Weekend.
Ministry for Primary Industries fishery officers uncovered the offending while out on patrol on land and at sea on both the west and east coast of the peninsula.
Spokesman Jason Howat says around 400 recreational fishers were subject to inspections and some paid the price for committing a range of offences.
"In general, compliance with fisheries regulations was high, with fishers playing their part in protecting the fishery by sticking to the rules.
"However, 14 infringements were issued for offences ranging from undersized fish (snapper), excess and undersized pāua, undersized scallops, undersized crayfish, and taking crayfish that were carrying eggs.