Valenciennellus tripunctulatus

Valenciennellus tripunctulatus, commonly called the constellationfish, is a species of fish in the family Sternoptychidae (hatchetfish).

Description
Valenciennellus tripunctulatus is small, growing no longer than 3.1 cm. It darkens its body at night by pigment dispersion. It is silvery-white in colour with several black spots; the name tripunctulatus ("three-spotted") refers to the larger spots on their ventral surface, although there are often more than three of these.

Habitat
Valenciennellus tripunctulatus lives all the world's non-polar oceans. It is bathypelagic and non-migratory, living at depths of 100 - 1000 m.

Behaviour
Valenciennellus tripunctulatus is a selective daytime feeder on copepods (mainly Pleuromamma) and ostracods (such as Conchoecia).

It breeds year-round, with egg batches about 100–360 eggs per ovary pair, the number increasing with animal size. It does not guard its eggs.