Grey knifefish
Encyclopedia
The grey knifefish, Bathystethus cultratus, is a sea chub
Sea chub
The sea chubs are a family, Kyphosidae, of fishes in the order Perciformes.-Subfamilies:* Girellinae - nibblers* Kyphosinae* Microcanthinae Johnson, 1984 * Scorpidinae...

 of the genus Bathystethus, found in New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

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