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Jawfish, Black Cap
Please Note: Due to variations within species, your item may not look identical to the image provided. Approximate size range may also vary between individual specimen.
Jawfish, Black Cap (Opistognathus randalli)
Additional locales and sizes may be available!

Quick Stats

Care Level Moderate
Temperament Peaceful
Color Form Black, Green, Orange, Tan
Diet Carnivore
Reef Compatible Yes
Water Conditions sg 1.020-1.025, 72-78° F, dKH 8-12, pH 8.1-8.4
Max. Size 4½"
Origin Indo-Pacific
Family Opistognathidae
Minimum Tank Size 30 gallons
Compatibility View Chart
What do these Quick Stats mean? Click here for more information


The head and body of the Black Cap Jawfish, are green with faint orange stripes. It has a black spot on the dorsal fin, as well as a black cap on top of the head.

It should reside in a 30 gallon or larger aquarium with a tight-fitting lid to prevent it from jumping out, and at least 3 inches of mixed substrate for burrowing. It poses a possible threat to small shrimp.

The Black Cap Jawfish is hardy and will spawn successfully in an aquarium.

The diet should consist of a variety of marine fish, crustacean flesh, and mysis shrimp. It prefers to be fed at least three times per day.

Approximate Purchase Size: Small: 1" to 2"; Medium: 2" to 3"; Large: 3" to 4"; XLarge: 4” or larger.

Customer Testimonials

Anonymous Worchester , MA
Needs a 30 gal HIGH or bigger. Feed frozen Mysis. Not recommended for beginners!!. Needs a deeper substrate than a Pearly Jawfish. This Jawfish is also bigger in size and girth than the Pearly Jawfish.
Ryan F Lake Zurich , IL
I just ordered this fish and he is very cool to watch. I love how when he feels threatened he opens his huge mouth. I definitely recommend it!!
1-2 of 2 testimonials

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