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Hatchetfish can regulate the intensity and color of light from these organs to match the light filtering down. Each species of hatchetfish has its own particular pattern of lights.
[edit] Hatchetfish in aquaria
The river hatchetfish is a schooling species best kept in groups of five or more that spends most of its time in the top-level of the water where it searches for food.
Lovely Hatchetfish Argyropelecus aculeatus
An expert at hiding from predators, the hatchetfish's silvery coloration and use of bioluminescence conceals it against the downwelling light. They are also so thin that they are difficult to see head-on.
Large Hatchetfish, Argyropelecus gigas Norman, 1930
Large jar containing a holotype
Large minerals in basaltic volcanic rocks in eastern Australia, with examples from Queensland
Large-eared Flying-fox
Large-eared Horseshoe Bat ...
SC: Tetras, Hatchetfish, Corydoras, Apistogramma , Discus, Loricarids, gouramis
FOOD: Flakes; live; insect larvae, Brine Shrimp, Tubifex
SEX: The females are plumper.
B: Use a breeding tank that contains bushy plants.
STOMIIFORMES
bristlemouths, marine hatchetfishes, lightfishes, viperfishes, saly dragonfishes, snaggletoothes, scaleless black dragonfishes, loosejaws, black dragonfishes
ATELEOPODIFORMES
jellynose fishes ...
CHARACIFORMES
Includes African tetras, curimatas, trahiras, freshwater hatchetfishes, pike-characids, characins
PIRANHAS ...
For example, several families of deepsea fishes (deepsea hatchetfishes , pearleyes , giganturids , barreleyes) have elongate (long and narrow), upward-pointing, tubular eyes that enhance light gathering and binocular vision, ...
 See also: Coral, Dolphin, Reptile, Manta ray, Manta
  
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