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 Celestial Pearl Danio

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chicknefoot87
Sergeant 1st Class
Sergeant 1st Class
chicknefoot87

Posts : 203
Location : Mission Viejo,CA
Favorite Fish: : Goldfish and Koi! I have to represent for the serious goldfish hobbyist.

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PostSubject: Celestial Pearl Danio   Celestial Pearl Danio Icon_minitime12/15/2009, 2:47 pm

Celestial Pearl Danio Pic_13450_6


Description:This is a small plump danionin with a markedly blunt snout, measuring just 1.5-2 cm standard length. The body is about three times as long as it is high. In general shape, it resembles "Microrasbora" erythromicron more than any other known species.
Female
This species shows some sexual dimorphism: males have a bright blue background color (dull blue-green in females), and their fins are more brightly colored. The tail end of their bodies (the caudal peduncle) is also higher than in females. The body is sprinkled with small, pearly dots. The back is bronzy green, and the belly in females is yellowish-white. The gill covers are transparent, letting the blood-red gills shine through.

The males' fins (except the pectoral fins), which they will prominently display to conspecifics, show two parallel black lines with a bright red area in between; on the tailfin this pattern is present twice (once on each lobe) and the outer black band is vestigial. Females have a weaker version of the pattern in the tail and dorsal fins only, sometimes in the anal fin too.

Courting males develop a red belly and the flanks brighten and darken, making the pearly spots stand out even more, with the back appearing paler than the flanks and also standing out. Females in reproductive age can be recognized by a black anal spot which separates the belly color from the uniformly reddish base of the anal fin. Males have a small black pad at the edges of the lower jaw, which is absent or reduced in females. Immature fish show some indication of a striped pattern, which eventually decomposes into the pearly dots.[3]

ReproductionThe spawning behavior has significant consequences for captive breeding (see below). It appears as if the Celestial Pearl Danio is adapted to somewhat ephemeral habitat. It does not have a dedicated spawning season, nor do the females lay continuously. Rather, they produce small batches of around 30 eggs per spawning episode. The time between spawnings is unknown at present. Eggs are not strewn freely into the water, but they are not deposited in clutches to a prepared surface either; rather, it seems, that they are hidden away in vegetation as a loose batch. Courting males will seek out and try to defend a patch of dense vegetation. While pursuit swimming has been observed, it does not seem to be connected directly to the actual act of reproduction in which the male displays to a passing female, and tests her readiness with a brief chase. The pair then moves into the substrate and deposits the eggs. Other males noticing reproduction will try and follow the mating pair, either to try and fertilize the eggs with their own sperm or eat them.[3]

At 24-25°C, the larvae hatch after 3-4 days. They are dark and cryptic initially and for about three days after hatching, they hide away between substrate and detritus and are very hard to see. They subsequently become lighter in color and start swimming freely and feeding on their own. At some 8-10 weeks after hatching, they undergo metamorphosis to adult form, and the color pattern starts to appear from week 12 onwards.[3]

In the aquarium
The Celestial Pearl Danio is a rather undemanding fish if its basic requirements are being taken care of. It seems quite hardy but obviously thrives best in fairly soft and slightly alkaline water at not too high a temperature - conditions that can often be met with pretreated tap water. It does not require much space, as it is not a very active swimmer, and is not a true shoaling fish, meaning it does not require large numbers of conspecifics for its well-being. In a small tank, a group of 6 individuals - half males, half females - will do well and exhibit natural behavior. They tend to be rather stationary, hovering in a peculiar position in favorite spots; males and females tend to keep separate when at rest. Altogether, their behavior again resembles "Microrasbora" erythromicron more than other fish.[3]

Tanks for the Celestial Pearl Danio should be well-planted and direct daylight may be favorable (the natural habitat is so shallow as to be well-lit throughout). Water weed and similar plants should be abundant, and stones and wood to create hiding spots should be provided. It is advisable to supply the fish with a spawning mop or a dense growth of suitable plants (java moss has been successfully used). A dense tangle of natural plants for spawning has the additional advantage of harboring protists on which the fry feed initially. The Celestial Pearl Danio seems overall quite peaceful, though some fin-nipping occurs. Consequently, it cannot be accompanied with large or "bully" fish. Small, swarming danionins which require similar water conditions would be a natural choice for company, as such more active species provide nice contrast behaviorally and, being available in a wide range of colors and patterns, also make it possible to choose fish that complement the brilliant colors of D. margaritatus. Note than many danionins prefer slightly acidic water however, and that maintaining the rather high pH found across the Inle basin seems a necessary condition to keep fish from there successfully.
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philuponthepho
Captain
Captain
philuponthepho

Posts : 1059
Location : Arlington
Favorite Fish: : Anything I can afford (which is $0)

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PostSubject: Re: Celestial Pearl Danio   Celestial Pearl Danio Icon_minitime12/15/2009, 2:52 pm

Whats with all these badass fish?> lol!
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nick a
Sergeant
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nick a

Posts : 113
Location : Austex

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PostSubject: Re: Celestial Pearl Danio   Celestial Pearl Danio Icon_minitime12/16/2009, 6:28 am

Excellent article!
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PostSubject: Re: Celestial Pearl Danio   Celestial Pearl Danio Icon_minitime12/16/2009, 7:39 am

I have seen these guys in a heavily planted 10g and they look amazing!
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PostSubject: Re: Celestial Pearl Danio   Celestial Pearl Danio Icon_minitime

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