Fisheries

Tuna is a generic Māori word for freshwater eels. The word will be used interchangeably in this resource.

NIWA has transformed 1.5 million square kilometres of data into the most accurate and detailed map yet of the land underneath the sea around New Zealand.

Currently, the most reliable method to estimate the age of tuna is by examination of their otoliths or "ear bones"

Casal2 is an advanced software package developed by NIWA for modelling the population dynamics of marine species.

Rig shark is an important inshore commercial fish species in New Zealand, and we need to understand more about their habitats, movements, nursery grounds and vulnerability to human impacts to ensure they are managed sustainably and their productivity is enhanced.

NIWA is today issuing some scientific information on the parasite Bonamia ostreae, recently discovered in Big Glory Bay, Stewart Island, and the risk it poses to the Bluff oyster fishery.

Commercial eel fishery in New Zealand began in earnest in the 1960s and expanded rapidly until the early 1970s

Atlantis is a 3D, spatially-explicit, trophodynamic ecosystem model that integrates biology, physics, chemistry and human impacts to provide a synoptic view of marine ecosystem function.

The need to provide upstream passage facilities for ensuring the long term sustainability of migratory freshwater fish populations is now well recognised.

To prepare for changes in climate, our freshwater and oceans decision-makers need information on species vulnerability to climate change.

NIWA expends considerable effort on determining the age of commercial fish species. But why age a fish? And how do we do it?

NIWA scientists have made the rare discovery of a days-old ghost shark during a recent survey off the east coast of the South Island.