Oceanic lightfish
Vinciguerria nimbaria
The Oceanic lightfish has a streamlined, translucent body with bioluminescent organs along its sides, typically exhibiting a silvery hue.
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About the Oceanic lightfish
Oceanic lightfish is a tiny silvery glowbug that spends the day deep and then rides up toward the surface at night in big schools. It tops out around 5.5 cm and stuffs itself with copepods, making it prime fuel for tuna and other predators. Super cool pelagic fish, but it is a true open-ocean species and not a home-aquarium candidate.
Also known as
Quick Facts
Size
5.5 cm
Temperament
Peaceful
Difficulty
Expert
Min Tank Size
1000 gallons
Lifespan
6-12 months
Origin
Tropical and subtropical oceans worldwide
Diet
Zooplanktivore - mainly copepods and other small crustaceans
Water Parameters
12.2-28.8°C
7.8-8.4
300-400 dGH
Need a heater for this species?
This species needs 12.2-28.8°C in a 1000 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Use a round or kreisel-style chilled marine setup, 300+ liters, with blacked-out sides; view under dim red light only.
- Run 8-14 C (do not exceed 16 C), 35 ppt (1.025-1.027 sg), pH 8.0-8.3; keep O2 near saturation via skimmer or O2 cone in the sump and keep microbubbles out of the display.
- Set a gentle continuous gyre so they can cruise in midwater; soft screens on overflows and pumps so no tails get sucked in.
- Feed live calanoid copepods, enriched Artemia nauplii, and shaved mysid or krill kept suspended; trickle-feed tiny portions 6-10 times daily, mostly after lights-out.
- Keep a school of 8-12 so they settle; skip tankmates unless they are small, non-nippy, coldwater plankton-eaters, and never mix with anything that hunts by sight.
- Acclimate in the dark with a chilled slow drip and minimal handling; move using water-filled cups (no nets) and use a tight lid because they launch.
- Expect zero breeding in captivity - they broadcast spawn and the larvae are oceanic plankton; enjoy them as a schooling display only.
- Watch for head-up floating, wall-bumping, or red gills after collection; dim the tank, stabilize temp, and use a floating corral ring to keep them off the glass while they recover.
Compatibility
Good Tankmates
- A big group of their own species, 12+ if you can swing it. Schooling keeps them calm and feeding.
- Other gentle mesopelagic schoolers like lanternfish (Myctophidae), run in a chilled, very dim tank.
- Pearlsides and marine hatchetfish (Maurolicus, Sternoptyx) that share the midwater lane and are not nippy.
- Small coldwater smelts and similar small-mouthed pelagics like capelin or rainbow smelt, sized so no one fits in a mouth.
- Slow, non-predatory coldwater pelagics that pick tiny plankton and do not crowd-feed aggressively.
- Public aquarium style mixed deepwater display neighbors of similar size and cruising speed, kept at 6-10 C with high O2.
Avoid
- Anything fast and predatory with a big mouth like mackerel, jacks, small tunas, or barracuda.
- Rowdy tropical reef fish like damsels, triggers, or big wrasses. Wrong temperature and way too pushy.
- Ambush or cruising predators from deep water like cods, hakes, or barracudinas. They will snack on lightfish.
- Hyperactive schooling clupeids like sardines and anchovies that will bulldoze them at feeding time.
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