Earth Sciences NZ is asking recreational fishers in the Marlborough sounds to help with a research project into what happens to blue cod after it has been returned to the sea.
The research, commissioned by Fisheries New Zealand, follows recent surveys showing several factors contributing to low levels of blue cod in the Sounds.
“Recent surveys show up to 70 per cent of blue cod caught by private boats are then released and a high proportion of fish in the fishery are undersized.
“Understanding, and if possible increasing, the survival rate of returned blue cod is therefore important for rebuilding the blue cod population,” Simon Lawrence, Fisheries New Zealand Director Science & Information says.
Earth Sciences NZ project coordinator Niki Davey says the support of recreational fishers is critical to the study’s success.
“The project aims to increase our understanding of what happens to blue cod after they are released, which requires good information from people actively fishing in the area,” Niki Davey says.
“By taking part, fishers will help ensure that this information, which may be important for managing the fishery, is based on real world fishing practices. Every trip recorded helps build a more accurate picture of the fishery.”
Blue cod is one of the most sought-after species in the region, with recreational catches similar in size to the commercial fishery.
“Good fisheries management decisions are based on having the best possible information, and we thank fishers who take part in the survey for doing their bit to help support sustainability in this beloved fishery,” Simon Lawrence says.
The project will run for 12 months (May 2026 – April 2027) to capture seasonal patterns in fishing activity.
How fishers can help
Fishers in the Marlborough Sounds Area are asked to record simple details about blue cod they catch, whether the fish is kept or released. This includes information such as fish length, capture depth, hook location, whether the fish was bleeding, whether it floated, swam away on release, or was eaten by a shag (or other predator).
There are two ways to record the data.
The Citizen Science App. The app is free and easy to use and works without mobile coverage. Data can be entered at sea and submitted once back at the ramp or at home. Fishers can use the app on multiple trips, with no need to manage paper forms or returns.
Secondly, waterproof paper forms will be available at Waikawa, Picton and Havelock boat ramps when staff are present. Measuring mats and clipboards will be provided, and staff can also show fishers how to download and use the app if they’re interested. Completed forms can be returned by photo, email, or dropped into collection boxes at the ramps.
Staff will be working on good weather fishing days at the boat ramps, mainly in the mornings when most fishing trips begin.
Alternatively, fishers can contact Niki Davey at Earth Sciences New Zealand to arrange access to the form or app and a measuring mat: ni********@***********es.nz.
