Barred Knifejaw
Oplegnathus fasciatus
| Stock | Variations | Price | Quantity |
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Monday – Friday 8 AM – 9 PM
Saturday 12 PM – 4 PM
Sunday 12 PM – 9 PM
Healthy, stable animals from vetted suppliers — inspected before packing, shipped overnight. Decades of experience built this model so we can deliver premium livestock at 30%+ less than you'd pay elsewhere.
| Care Level | Expert |
|---|---|
| Temperament | Semi-Aggressive |
| Reef Safe | No |
| Functional Benefit | Ornamental Only |
| Diet Type | Carnivore |
| Mininum Tank Size | 300 gallons+ |
| Max Size | 24 inches |
| Temperature | 72–78°F |
| pH Range | 8.1–8.4 |
| Specific Gravity | 1.022–1.025 |
The Barred Knifejaw (Oplegnathus fasciatus), also known as the striped beakfish or rock bream, is a rocky-reef species recognized by its pale body with bold, vertical dark bars and a beak-like mouth formed by fused teeth. This is a large-growing fish in its natural range, making it best suited to big marine display systems where its cruising behavior and feeding style are easy to observe.
What You’ll Observe:
- Patrols open water and makes steady passes along rockwork throughout the day
- Uses its strong jaw to “test” hard surfaces and pick at attached items while foraging
- Learns feeding routines and often comes forward when it recognizes activity near the glass
- Shows purposeful, confident movement patterns rather than hovering in one spot
To succeed with this fish, provide a spacious layout with open swim lanes plus sturdy rock structure for exploring. Offer a meaty, marine-based menu and include harder items at times (like shell-on foods) to match its natural feeding style on hard-shelled prey. Maintain stable saltwater parameters and plan your aquascape around a fish that interacts physically with its environment.
Does the bar pattern stay the same as it grows?
Juveniles are known for the strong barred pattern, but some adults (especially large males) may darken in the face and show less striping over time.
Is it normal for this fish to “bite” rock or tap objects with its mouth?
Yes—many keepers describe this as typical exploratory foraging for a beak-mouthed fish, especially when it is settling in and mapping the tank.
Will it recognize the owner or become interactive at feeding time?
Often, yes. Many larger marine fish quickly associate footsteps and tank-side movement with feeding, and the Barred Knifejaw commonly becomes an “at-the-glass” fish once it has a routine.
Should I expect it to hide for the first few days?
It’s common for newly introduced fish to spend time exploring and then retreating to a preferred zone; consistent lighting schedules and predictable feeding times usually help it settle into a visible daily loop.
Do these fish tend to be rough on aquascapes and equipment?
They can be. It’s worth securing rockwork and using durable mounting choices so normal foraging and bumping doesn’t shift unstable structures.
We source from vetted suppliers known for healthy, long-lived specimens.
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