Grey knifefish
The grey knifefish (Bathystethus cultratus) is a species of sea chub native to the Pacific Ocean from Australia to New Zealand and the Kermadec Islands.  This species is a plankton eater which swims constantly within a few meters of the surface of the ocean.  This species can reach a length of .

References

Scorpidinae
Endemic marine fish of New Zealand
Fish described in 1801