Giant Danio – Danio Balabaricus

breeding the giant danil with Dr Thomas R. Reich

Danio Balabaricus –  Giant Danio

By:  Dr. Thomas R. Reich PhD

 

General Information on Giant Danio

The Giant Danio or Danio Balabaricus belongs to the family Cyprinidae and was first imported in 1909. breeding the giant danil with Dr Thomas R. ReichAs its name   suggests, this is the largest of the Danios; it used to be known under the scientific name of Danio Malabaricus. The Giant Danios originates from southwestern parts of India and Sri Lanka.  It is pale blue in color with three or four pale yellow stripes or blotches   running down the sides of its body. The dominant individuals in a group of these fish will be the dominate male, and this fish should be selected for breeding.

Further, the body is slim, elongated, strongly compressed at the sides, and up to 4 inches   long. The back is steel-blue, the flanks greenish, behind the gills there are two to three   transverse golden bars, and the sides are decorated with blue and goldfish longitudinal   stripes. The male is usually smaller and has more distinctive coloring.  In the spawning   season he has orange pectoral fin.

breeding the giant danil with Dr Thomas R. Reich

In its natural surroundings in India, it is quite common and lives in clear, stagnant and running waters along the Malabar Coast, and grows up to 8 inches in length, but that would be an exceptional specimen even in a large stream. Tank raised specimens will rarely grow larger than 4 inches. The mouth has two sets of barbells, although captive specimens are usually missing the barbells on the upper jaw.

In spite of its large measurements, this fish can be kept with other, smaller species. An extremely peaceful fellow, it is very tolerant of other fishes in its environment. It very  much appreciates a little morning sunlight in its tank!

 

Sexing a Breeding Pair of Giant Danio

breeding the giant danil with Dr Thomas R. Reich

The sexes are easy to tell apart by the slimmer, more attractive appearance of the male, and the “stuffed” belly of the female. This Danio is known for its incredible speed,   noticeably faster than that of other species. It is practically impossible to remove this fish from a well planted community tank without creating a great deal of disorder, unless you take its flight direction into account and capture it between the net and the receiving jar or second net.

 

The Breeding Process of the Giant Danio

breeding the giant danil with Dr Thomas R. Reich

The breeders, 1 female and 2 females should be conditioned on live food and kept   separately for 7 to 10 days. Set up the breeding tank (at least 10 gallons, though 15 or 20   long is ideal) the same as with Zebra Danios, with the marble bottom, however, the water   depth needs to be 8 inches, and you must add several nice clumps of fine leaved plants.   The manner of fertilizing the eggs is characteristic of other Danios, and a steady   temperature of 75F t0 79F is great. However, during mating, the male pushes himself   against the female and brings his anal fin, which he has rolled up into a kink of a bag,   under the female’s anus.

breeding the giant danil with Dr Thomas R. Reich

The eggs are caught in this “bag” and are fertilized at once.   The male then scatters the fertilized eggs among the plants. The number of eggs per   meeting is small – only 5 to 20, but this process is repeated many times over about a 2   hour period and a total of 200 to as many as 400 eggs are produced fertilized and laid.

breeding the giant danil with Dr Thomas R. Reich

The eggs are clear as glass, not adhesive, so most will fall through the plants into the   marble base and be fully protected from the breeders. The eggs measure about 1mm in   diameter, much larger than the Zebra and its other close relatives. Once the breeders   activities have stopped remove the breeders at once.

breeding the giant danil with Dr Thomas R. Reich

After two days after the eggs have been laid, the first young fish appear. Depending on   various factors, however, it can take as long as a week before the last egg has hatched   out. Temperature is not the least of these factors.

 

Just How Hardy are the Giant Danio Fry

I once had an interesting experience with a group of Danio’s I was breeding (a trio of   Long fin Blue Leopard Danios). I set up the breeding tank in the usual way, and after a   day or so, I was convinced the fish had not bred. I thought, since they were a very fancy   strain, something had gone wrong and that they had failed to breed. I returned the   breeders to the conditioning tanks, and dumped the water in the tank, setting outside in   the cold, about 41F at night for a day, then brought the tank back in to prepare it for   breeding again, this time Fire Neons.

breeding the giant danil with Dr Thomas R. Reich

I decieded not to sterilize the marbles on the   bottom and to just fill the tank with fresh aged water. On the evening of the second day,   the tank was filled with the aged water, and readied for breeding. The temperature was   raised to 75F for breeding the Fire Neons and the breeders introduced the evening of the   fourth day. The next morning, when I was observing the behavior of the pair of Fire   Neons, I observed hundreds of slivers hanging from the glass sides of the tank. Not knowing what was actually going on I removed the Fire Neons. I did not know if the fry   were fast hatching Neons or what? I decided to raise the fry and as the days passed other fry appeared.

breeding the giant danil with Dr Thomas R. Reich

I raised the young and both the Blue Longfined Leopard Danios and Fire Neons grew up   happy and healthy together! This shows that the fry of the Bracydanio and Danios   species are much heartier than anyone could have expected, left with nothing but the   slightest amount of moisture for over 24 hours and exposed to temperatures as low as   41F, the eggs survived and hatched with no ill effects. Further, that the fry learn to   survive in adversity, even when combined at birth with other species!

breeding the giant danil with Dr Thomas R. Reich

 

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