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General Body Form:
A moderately rounded, laterally-elongated fusiform shape. Fins are moderate-length and rounded, with a homocercal caudal fin. Small terminal mouth with two pair of long barbels. (D. roseus has a shallower, more slender body and shorter rostral barbels than the next most similar species, D. albolineatus (Pearl Danios.)
A beautiful rosy-peach coloration underlies pale blue stripes running the length of females and intense purple-blue coloration along the flanks of males. Males further have deeply rose-colored abdomens, dorsum, anal and pelvic fins as well as a flush of the color on the caudal peduncle. Color differences between the sexes are most noticeable during spawning time.
Omnivorous: Feeding primarily of insects and larvae in nature, in the aquarium, D. roseus eagerly accepts live and frozen bloodworm, brine shrimp and daphnia as well as quality small pellet and flake variety diets. For best coloration, live and frozen proteins should be offered at least part of the time.
Freshwater: In nature, D. roseus is accustomed to cool running water, springs associated with waterfalls, small creeks as well as the Mekong River.
Oviparous: Egg-scattering free-spawners: Easy. Males are both sexually dimorphic and mildly dichroic, having brighter colors and rounder bodies than females. The greatest challenge to overcome is Giant danios are voracious egg-eaters. A breeding tank-- at least 10 – 20 gallons (37.9 – 75.7 liters) --with marbles as substrate allow the eggs to fall between the marbles and safely out of reach of their parents mouths. Additionally, your tank should have heated, mature water, a sponge filter and an air stone for oxygenation and circulation (the addition of baby grass, java moss or spawning mops is optional as the safest place for the eggs to fall is between the marbles.) At least a week prior to spawning, condition the parents on a diet rich in protein such as bloodworms, brine shrimp or tubifex worms which will help build roe in the female. When the female(s) to be spawned appear gravid (their abdomens will be distended with eggs and a small dark spot will appear just before the fish's urogenital opening,) one or two pair should be placed into the breeding tank toward evening (as spawning will occur around dawn.) When ready, the female releases close to 300 eggs, with the male following, fertilizing the eggs as he swims along. Giant danios provide no aftercare for the eggs, so it's best to remove the adults within 24 – 48 hours of spawning. Incubation of the eggs generally takes 24 -36 hours, with the fry being free-swimming a few days later. Initially offer the fry green algae, small crustaceans, paramecium and protozoans common in aufwuch cultures, segueing to Artemia naupaii and crushed flake food in a week or so once the fry are large enough to accept the larger foods.
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