Threadfin Fish
Alectis indica
| Stock | Variations | Price | Quantity |
|---|
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Full guarantee terms →Ships Monday – Thursday for next-day arrival at your nearest FedEx Hold location — typically ready by 9 AM. We monitor every delivery.
Shipping details →
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 | With Caution |
| 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 Threadfin Fish (Alectis indicus, often listed as Alectis indica) is a large, open-water jack known for its reflective, diamond-like body shape and fast, cruising swim style. Juveniles may show the signature “threadfin” streamers, and the species is also seen in the trade under names like Indian threadfish, diamond trevally, and mirror fish.
What You’ll Observe:
- Long, looping patrols across the full length of the aquarium, especially in high-flow areas
- Quick turns and short bursts of speed when food hits the water
- A consistent “lap route” that becomes more predictable over the first couple of weeks
- Color shifts from bright chrome-silver to darker tones depending on viewing angle
- In very large systems, it may cruise alongside other active, similarly sized fish
For best results, provide a public-aquarium style layout with wide open swimming lanes and strong, stable filtration designed for large, active fish. Offer meaty marine foods in multiple smaller feedings and keep a secure lid to support confident, steady day-to-day activity.
Will the long “threadfin” streamers stay as the fish grows?
Most hobbyists report the long filaments are most noticeable on smaller juveniles and become much less prominent with size.
Is “Alectis indicus” the same fish as “Alectis indica”?
Yes—both names are commonly used in the hobby for the Indian threadfish, so you may see either spelling on invoices and listings.
Why do people say this fish “needs length” more than rockwork?
Owners tend to focus on long, uninterrupted swim lanes because this species spends much of its time cruising in open water rather than hovering in structure.
Does this fish spend time near the surface, or stay mid-water?
Many keepers note juveniles often cruise higher in the water column at first, then use more of the tank once they settle into a routine.
What’s the most common “upgrade plan” people mention with this fish?
A frequent theme is starting with a juvenile only if there is a clear path to a very large long-term system, since the fish’s behavior and space needs scale up quickly.
We work with trusted suppliers who keep our specimens healthy and well-fed before shipping.
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