Bostockia porosa
Nightfish - Marinewise © 2023 MarineWise

Quick Facts

Scientific name Bostockia porosa
Other names Western Cod
Size Up to 15 cm (5.9 in)
Weight Up to 25 grams


Habitat & AU Distribution Freshwater habitats, wetlands, streams, lakes, ponds & dams amongst rocky areas, wood debris & vegetation
Depth Range 0 - 3 m (12 ft)
Nightfish Distribution

Interesting Info

  • The Nightfish is widespread in south-west Western Australia from the Hill River near Jurien Bay, to the Kalgan River near Albany.
  • The Nightfish lives in freshwater rivers, swamps and lakes around plants, wood and rocks structures. It hides in these areas during the day and becomes active at night.
  • They have a large mouth, broad head, and a mottled pattern of green, brown, and black on its body.
  • The Nightfish are carnivores that prey on various bottom-dwelling creatures, with a preference for small crustacean and insect larvae.
  • This species spawns in small tributaries in August and September after winter rains when freshwater discharge is high and temperatures and daylight length increases.
  • Maturity for males happens after their first year and females after their second.
  • Estimates on lifespan are around 6 years.
Species Interaction

Aquarium Fish

Nightfish can be a fascinating species to keep in an aquarium, their care requirements and predatory nature may make them more suitable for experienced hobbyists who are up for a challenge.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Percichthyidae

Genus: Bostockia

Species: Bostockia porosa

Conservation Status

Nightfish has a conservation status of “Least Concern” on the International Union for Conservation of Nature (IUCN) Red List.

As Aquarium Fish

Care Level: Difficult

Temperament: Very Aggressive

Diet: Carnivore

Reef Compatible: No

Minimum Tank Size: 50 gallons

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