Dredging is carried out on the seabed in shallow waters and targets marine creatures such as scallops. The commercial fishing year goes from 1 October to 30 September.
Ministry for the Environment
Environmental Reporting: Fishing effort (number of dredge tows) 1990–2014
https://data.mfe.govt.nz/table/2505-fishing-effort-number-of-dredge-tows-by-year-19902014
At URL provided, select 'Export' from the top right of the screen, and then 'Create Export'. You will have to register to download this dataset.
File as imported: Environmental Reporting: Fishing effort (number of dredge tows) 1990–2014
From the dataset Environmental Reporting: Fishing effort (number of dredge tows) 1990–2014, this data was extracted:
September 29, 2015
This data is collected through Catch Effort and Landing Return (CELR) forms. The original source is the Ministry for Primary Industries