Gold-specs jawfish
Opistognathus randalli
Also known as Randall's Jawfish, Black Cap Jawfish, Goldspecs Jawfish
SaltwaterFish
Care at a glance
- Temperature
- 73–81°F
- 23–27°C
- pH
- 8.1–8.4
- Adult size
- 3.9 in
- 10 cm
- Minimum tank
- 30 gal
- 115 L
- Temperament
- Peaceful
- Social behavior
- Social
- Swim level
- Bottom
- Difficulty
- Easy
- Breeding
- Hard
- Rarity
- Common
- Reef safe
- Reef safe
- Family
- Opistognathidae
- Origin
- Native to the western Pacific, from Indonesia and the Philippines to Micronesia, in sandy rubble areas near reefs.
Overview
Provide a 115 litre or larger tank with at least 8 cm of mixed sand and rubble and a secure lid, kept at 23 to 27 C and pH 8.1 to 8.4. It is reef safe and peaceful toward other species but territorial to its own kind, so keep one unless you have a pair and a large footprint. Feed small meaty foods such as mysis, enriched brine, and chopped seafood. Keep tiny ornamental shrimp out of reach of its mouth.
In the wild
The gold-specs jawfish builds a burrow in mixed sand and rubble and hovers above it, watching for food and threats. It is pale with a dark cap on the head and a gold ring around the eye. It carries mouthfuls of substrate to shore up the burrow walls. A deep bed of mixed grain sizes lets it dig and line its home.
Good to know
Opistognathus randalli is a western Pacific jawfish in the family Opistognathidae, named after the ichthyologist John Randall. It is a mouthbrooding fish, with the male incubating the eggs in his mouth. It uses shells and coral bits to reinforce the mouth of its burrow.
Did you know
Watching a jawfish rebuild its burrow, carrying one mouthful of gravel at a time, is one of the more entertaining sights in a sand bed tank.
Weekly picks
Tank mates
Gold-specs jawfish is a peaceful, social species that keeps to the bottom. These picks share a community profile with it, are safe together in both directions, and overlap on water type, temperature and pH.

Randall's assessor
Assessor randalli
Saltwater3.1 in (8 cm) · 29 gal (110 L)73–81°F (23–27°C)
Camel / dancing shrimp
Rhynchocinetes durbanensis
Saltwater2 in (5 cm) · 16 gal (60 L)75–81°F (24–27°C)
Tiger / strawberry conch
Conomurex luhuanus
Saltwater2.8 in (7 cm) · 20 gal (75 L)75–81°F (24–27°C)
Adorned wrasse
Halichoeres cosmetus
Saltwater5.1 in (13 cm) · 50 gal (190 L)73–81°F (23–27°C)
Yellowstriped cardinalfish
Ostorhinchus cyanosoma
Saltwater3.1 in (8 cm) · 30 gal (114 L)72–79°F (22–26°C)
Skunk cleaner shrimp
Lysmata amboinensis
Saltwater2.4 in (6 cm) · 20 gal (75 L)73–81°F (23–27°C)
Common questions
What size tank does a Gold-specs jawfish need?
A Gold-specs jawfish needs at least 30 gal (115 L). It spends most of its time in the bottom.
What temperature and pH does a Gold-specs jawfish need?
A Gold-specs jawfish is comfortable at 73–81°F (23–27°C) with a pH of 8.1–8.4.
How big does a Gold-specs jawfish get?
An adult Gold-specs jawfish reaches about 3.9 in (10 cm).
Related species
3.9 in (10 cm)30 gal (115 L)70–77°F (21–25°C)Blue-spotted jawfish
Opistognathus rosenblatti
3.9 in (10 cm) · 30 gal (115 L)
3.9 in (10 cm)29 gal (110 L)73–81°F (23–27°C)Pearly jawfish
Opistognathus aurifrons
3.9 in (10 cm) · 29 gal (110 L)
3.5 in (9 cm)20 gal (75 L)75–81°F (24–27°C)Blackline fang blenny
Meiacanthus nigrolineatus
3.5 in (9 cm) · 20 gal (75 L)
3.1 in (8 cm)20 gal (75 L)73–81°F (23–27°C)Buan's sleeper goby
Amblygobius buanensis
3.1 in (8 cm) · 20 gal (75 L)
3.1 in (8 cm)20 gal (75 L)73–81°F (23–27°C)Hector's goby
Koumansetta hectori
3.1 in (8 cm) · 20 gal (75 L)
3.1 in (8 cm)20 gal (76 L)72–79°F (22–26°C)Skilletfish
Gobiesox strumosus
3.1 in (8 cm) · 20 gal (76 L)
