Metallic lanternfish, Myctophum affine. From plate 22 of Oceanic Ichthyology by G. Brown Goode and Tarleton H. Bean, published 1896.
Source: https://commons.wikimedia.org/wiki/File:Myctophum_affine.jpg

Myctophum affine, the Metallic lanternfish, is a species of lanternfish native to the Atlantic Ocean. This species grows to a length of 7.9 centimetres (3.1 in) SL. Order: Myctophiformes, Family: Myctophidae.