วันพฤหัสบดีที่ 29 พฤศจิกายน พ.ศ. 2555

Fish Data : Giant Danio



Distribution :

    Described from Assam state in northeastern India but since reported from a vast area including much of northern India, Nepal, Bangladesh, Myanmar and northern Thailand. Historical occurrences in southern India appear to be a result of misidentification (Pramod et al., 2010).

    The Giant Danio is athletic fish with a great disposition. This fish brings constant swimming action to a community tank and should be kept in schools of at least 3 to 5 fish. It may be a bit too active for small, peaceful tanks and is more appropriate in a community of larger fishes.

    This fish is a true "giant" among danios. They can grow to a maximum length of four inches and is an excellent schooling fish in larger community aquariums. The Giant Danio is also a very attractive fish with captivating blue coloration. Its gold spots and lines intensify the blue-green background of this fish.

Tank Size :

    These fish are very active fish and should be kept in an aquarium of at least 30 gallons. You should make sure to always have a hood on your aquarium because the giant danio is known to jump. The Giant Danio is not difficult to keep in a well-maintained set-up though we recommend aquascaping the tank to resemble a flowing stream/river with a substrate of variably-sized, water-worn rocks, sand, fine gravel and perhaps some small boulders. This can be further furnished with driftwood roots or branches.

    Since it naturally occurs in pristine habitats it's intolerant to accumulation of organic pollutants and requires more-or-less spotless water in order to thrive. Though torrent-like conditions are unnecessary it also does best if there is a high proportion of dissolved oxygen and decent water movement in the tank so a good-sized external filter/powerhead or two should be added, and ideally a rivertank manifold installed to provide unidirectional flow. Weekly water changes of 30-50% tank volume should be considered routine, and the tank must have a very tightly-fitting cover as all Devario spp. are accomplished jumpers

 Tank Region: Middle to top.

Preferred Water Conditions:
    pH Level: 6.0 – 8.0
    Water Hardness: 5-19 dGH
    Temperature: 72-81 F, 22-27 C

 

Feeding :


     These fish are omnivorous, They can accepting almost any foods. Although undemanding in diet, they particularly enjoy small live or frozen inverts, and fresh vegetable matter.

Tank Mate :

     The Giant Danios are peaceful fish that can be mixed with most other fish of similar size exp. Other Danios, Corydoras Catfish, tetras, and barbs. Really any peaceful fish , it prefers to be in groups of six or more.
     Because they are very fast, they tend to be among the first to feed at meal times, so you need to ensure that slower eaters in your tank have some food to eat.

Sex Different :

     Sexually mature females should be rounder-bellied, less colourful and a little larger than males.




Breeding:

     The Giant Danio is an egg layer. They are stimulated to spawn by sunlight and will produce about 300 eggs. The hatching will occur within 36 hours. When you need to breeding Them , The adult Giant Danio group can still be conditioned together but a smaller tank with a base measuring around 45cm x 30cm tank should also be set up and filled with mature water. This should be very dimly lit and the base covered with some kind of mesh of a large enough grade so that the eggs can fall through but small enough so that the adults cannot reach them. The widely available plastic 'grass'-type matting can also be used and works well as does a layer of marbles. Alternatively filling much of the tank with a fine-leaved plant such as Taxiphyllum spp. or wool mops can also return decent results. The water itself should be of slightly acidic to neutral pH with a temperature towards the upper end of the range suggested above. An air-powered sponge filter or air stone(s) should also be included to provide oxygenation and water movement.

     When the adults have a well-conditioned and the females appear gravid one or two pairs should then be introduced. If ready spawning usually taking place within 24 hours, signified by the female appearing noticeably slimmer. After 48 hours the adults should be removed whether spawning has occurred or not. Incubation is temperature-dependant to an extent but typically lasts 24-36 hours with the young free-swimming a few days later. Initial food should be Paramecium or similar, introducing Artemia nauplii, microworm, powdered dry foods, etc. once the fry are large enough to accept them.


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