With slightly over 1,800km or around 20% of New Zealand's coastline, and several lakes, Marlborough provides a habitat for a wide range of fish species.
The sheltered waters of the Marlborough Sounds provide an ideal habitat for many species of fish, including a number of commercially important ones. Blue cod and snapper are perhaps the most important. Gurnard and kingfish are some of the other commercial species present.
In the shallow bays of the sounds, stingrays are common, and the ubiquitous spotties Notolabrus celidotus can be found throughout the Sounds.
Kawhai Arripis trutta, red cod Pseudophycis bachus and rig can all be found off the east coast.
Brown and rainbow trout and salmon have been introduced to various rivers and lakes in Marlborough. Trout can be found in the Wairau, Lake Argyle, Goulter, Fish Lake and Lake Sedgemere of the Tarndale Lakes.
Shortfin eels are widespread throughout the region, and are even found in urban drainage channels in Blenheim.
Whitebait (juveniles of various Galaxiid species) are found in rivers around the region.
Common Bullies are widespread.