An environmental advocacy group says the Government needs to do more to hold the fishing industry accountable after an error highlighted significant bycatch issues.
The Ministry for Primary Industries confirmed that 39 dolphin captures reported in December last year were actually a coding error. Two months later, it admitted the slip-up and the species caught was actually petrels.
Forest and Bird spokesman Geoff Keeysaid it was "hugely concerning" no one at the ministry or the fishing company involved seemed to notice or react at the time of the incident.
"Swapping dead dolphins for dead seabirds is no great relief for Forest and Bird," Keey said.
"Those three incidents in 2017 were equivalent to a 20-fold increase on the previous annual average of dolphin captures, yet neither MPI or the fishing company noticed anything was out of the ordinary," Keey said.