The black mudfish (''Neochanna diversus'') is a

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...

of the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Galaxiidae The Galaxiidae are a family of mostly small freshwater fish in the Southern Hemisphere. The majority live in Southern Australia or New Zealand, but some are found in South Africa, southern South America, Lord Howe Island, New Caledonia, and th ...

, found only in swamps and wetlands in the northern half of the

North Island The North Island, also officially named Te Ika-a-Māui, is one of the two main islands of New Zealand, separated from the larger but much less populous South Island by the Cook Strait. The island's area is , making it the world's 14th-largest ...

of New Zealand, from

Kaitaia Kaitaia ( mi, Kaitāia) is a town in the Far North District of New Zealand, at the base of the Aupouri Peninsula, about 160 km northwest of Whangārei. It is the last major settlement on New Zealand State Highway 1, State Highway 1. Ahipara ...

in the north to the Mokau River in the south. An 85-90% loss of wetlands has occurred, especially from

Waikato Waikato () is a Regions of New Zealand, local government region of the upper North Island of New Zealand. It covers the Waikato District, Waipa District, Matamata-Piako District, South Waikato District and Hamilton, New Zealand, Hamilton City ...

and

Hauraki Plains The Hauraki Plains are a geographical feature and non-administrative area (though Hauraki Plains County Council existed from 1920 to 1989 and a statistical Area Unit remains) located in the northern North Island of New Zealand, at the lower ( ...

. The most significant threat is wetland drainage, and this has slowed so the decline has stabilized; other threats include

mosquitofish The western Mosquitofish (''Gambusia affinis'') is a North American freshwater fish, also known commonly, if ambiguously, as simply Mosquitofish or by its generic name, ''Gambusia'', or by the common name gambezi. Its sister species, the easte ...

(which eat juveniles and compete with adults), pollution, sedimentation, and fires. It is considered a local delicacy by the local Maori populace when prepared using ancestral cooking techniques. Its length is up to 12 cm. Efforts by the

New Zealand Department of Conservation The Department of Conservation (DOC; Māori: ''Te Papa Atawhai'') is the public service department of New Zealand charged with the conservation of New Zealand's natural and historical heritage. An advisory body, the New Zealand Conservation Au ...

and regional councils have helped protect and reintroduce the fish.

References

black mudfish Endemic freshwater fish of New Zealand Fish of the North Island Taxa named by Gerald Stokell black mudfish {{Osmeriformes-stub