Regania nipponica Jordan & Gilbert, 1904 Bathygadus nipponicus is a species of rattail.

This is a deep-water fish found in the waters around southern Japan and northern Taiwan.

This species grows to around 57 cm (22.4 in) in length.

It has a fairly wide mouth with a low, broad snout, large eyes and no chin barbel.

The mouth is terminal with very small, conical teeth.