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Tuna kuwharuwharu/Longfin Eel Anguilla dieffenbachii

Native. At risk-declining.

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Mainly a nocturnal species, they live in rivers and lakes but can also be found in most types of water, usually inland from the coast but can equally survive in farm drains, dams and large ponds even if the water is quite murky water. Most habitats would have some bank shading. A second species, Tuna Hinahina/Shortfin Eel A. australis is also found in our rivers but is not as abundant.

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Breeding takes place only once in their lifetime when they migrate some 5000 km across the Pacific to lay their eggs off the coast of Tonga, after which they die. Spawn drifts back to Aotearoa New Zealand on sea currents, hatching en route. On entering freshwater to start their migration up-stream they change into "glass eel" and it could be up to 80 years before these repeat the journey.

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The Department of Conservation produces an excellent information sheet which includes links to an activity book and many other aspects of their lives.

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Whitebait Galaxias sp.

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Whitebait is the collective name for the juvenile stage of five species of fish of the genus Galaxias. The most frequently caught of the five, Inanga G. maculata has a wide distribution reaching as far as Argentina but listed as declining in Aorearoa New Zealand.

 

Kōaro G. brevipennis is also found in Australia while the Banded G. fasciata, Giant G. argeneus and Shortjaw Kōkopu G. postvectus.are found nowhere else other than in Aotearoa New Zealand. Whitebait are caught as they start their migration up-stream.

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As a group they are fascinating with a diverse lifestyle, much of which is covered in a fun Whitebait activity book produced by the Department of Conservation and available here for download. 

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They are a much-loved source of food which are caught in nets over a brief period each year. Current regulations can be found

here.​

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Wikipedia - Whitebait

Find, protect and create inanga spawning habitat is an informative guide produced by the Department of Conservation covering all aspects of protecting and enhancing spawning grounds for this important species.
 
Whitebait Connection is a nationwide environmental education programme that empowers communities, landowners and schools to explore, understand, and protect freshwater ecosystems. It focuses on native freshwater fish, particularly whitebait species, and teaches participants about their life cycles, habitats, and threats. Through hands-on learning, stream studies, and restoration projects, it encourages kaitiakitanga and community action to improve waterway health and supports the survival of these taonga species.
 
McDowell, R.M. 1984. The New Zealand Whitebait Book. A.H. & A.W. Reed Ltd Taylor, M.J.. 2002.

The National Inanga Spawning Database:
Trends and Implications for Spawning Site Management. Department of Conservation Science for Conservation no. 188

Giant Kōkopu Galaxias argenteus

Endemic. At risk-declining.

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This is the largest member of its family with specimens of over 450 mm in length have been reported This is rare with fish in the range of 200–300 mm being the more common size.

It was the first of its genus (family) to be discovered and the whole group was given the name Galaxias because of the profusion of spots on adults giving the appearance of stars in the galaxy.

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Only found in low numbers in the whitebait catch, they can live in land-locked bodies of water such as lakes, and in streams where water-flow is slow with ample overhanging vegetation for shelter. 

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They are mainly nocturnal in habit and feed on a variety of insects and other aquatic life. More information on this interesting species can be found here.

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Wikipedia-Giant Kokopu

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Brown Mudfish  Neochanna apoda
Endemic. At risk-declining.

Five species of mudfish, all endemic are found in Aotearoa New Zealand. Of these five, the Brown  is the local species and although there seems to be only one record for the estuary, it is present in small numbers in the loop at Foxton.

It is a member of the Galaxiid family which contains many of our native freshwater species, including those that make up the Whitebait catch but unlike them they are not migratory.

These are fascinating fish with a fairly unique lifestyle. They are found in damp habitats such as swamps. wetlands and slow-flowing streams and when these dry out and surface water disappears they are able to survive by searching out damp vegetation or tree roots where they are able to remain moist​

easytodistiguishfromwhiteait
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Department of Conservation-Marvellous Mudfish
whitebait
Giant Kokopu
Brown Mudfish
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