Newsgroup: it.hobby.acquari
Titolo: Vaschetta x riproduz.Rasbora

Ho messo in una vaschetta da 3 litri una presunta coppia di Rasbora.
Dovrebbero essere maschio e femmina secondo me.
L'acqua è a circa 22 gradi con ph 6.5 niente arredi ,niente piante,niente
filtro.
Solo pesci e acqua.
Quanti giorni dovrebbero restare li dentro x deporre?
Se non vedo uova entro 24/48  ore li tolgo?
Chi ha suggerimenti,qualunque accorgimento dica pure! Sono alla mia prima
esperienza!
Grazie a tutti

 esperienza!
Allora.
Personalmente ho avuto numerosi accoppiamenti di R. hengeli ma non ho mai
fatto nulla di mirato per salvare le uova o crescere i piccoli.
Di sicuro c'è che se isoli una coppia devi fornire loro un substrato per
deporre e devi fare in modo che le uova non vengano poi mangiate dai
genitori.
Se sai l'inglese ti copio\incollo uno stralcio di un articolo preso in rete
Si parla di R. eteromorpha che è poi la specie piu' comune:
For breeding heteromorpha it is, of course, important to be able to
distinguish the sexes of the brood stock. In males the dark blue triangular
spot is clearly delineated along the lower part of the abdomen, while in
females the lower edge of the triangle is less defined. Moreover, a gravid
female can be recognized by her round abdomen. We breed this species in
pairs kept in tanks of 6 to 10 liters (1.5 to 2.5 gallons) in volume. A
small number of eggs tend to fall to the bottom, where they can be easily
seen and are thus threatened. Therefore, it is advisable to cover the bottom
with a grate so that the eggs become inaccessible to the fish.
For actual spawning the pair tends to prefer broad-leaved plants, and plants
like Echinodorus, Cryptocoryne, Aponogeton, and Microsorum make adequate
spawning media. The color of the spawning substrate appears to be
irrelevant. Usually, the breeding pair will spawn within two or three hours
after they have been placed in the breeding tank. The male often takes up a
position above the female, and he attempts to push the female downward.
Eventually the fish position themselves side-by-side below or sometimes also
above the leaf, and at the peak of the spawning act the male wraps his tail
over the female. The attached eggs are immediately fertilized by the male.
Most of the eggs will remain on the leaf, but some may fall to the bottom.
At the peak of spawning the eggs are not always attached to a leaf by the
female. Young breeding pairs especially fail to attach their eggs properly
on occasion. Sometimes we notice that a significant number of eggs are
attached to the top of the leaves and the undersides are totally bare. It is
possible in such instances that the breeding pair had been disturbed while
spawning.
Once the spawning has been completed, the breeding pair is removed from the
tank. The eggs will develop normally under the following water parameters: 3
to 5 dGH, 2 to 5 dkH, pH value 6.8 to 7.4, and a water temperature of 79F
(26C) to 82F (28C). The larvae hatch within 48 hours, and once the yolksac
is absorbed they will accept tiny live foods such as rotifers, cyclops, or
Artemia nauplii.
A single spawn can produce anywhere from 70 to 200 young, depending upon the
age and condition of brood stock. If, for instance, very young females are
used, the result can be just 40 eggs with an eventful outcome of only 30
young or so. Experience has shown that the optimum breeding age for brood
stock is seven to eight months, one year at the most.
Buon lavoro,
--
Fabio Sebastiani
Roma
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Avevo sentito che anche senza substrato le uova cadevano sul fondo.
Sto usando un 3 litri xche non ho altro.
In vasca insieme a tutte le altre rasbore,molti individui mostravano segni
di accoppiamento.
Perņ quando vai a prenderle col retino,dato che č un operazione snervante e
difficile in mezzo alle piante,non hai possibilitą di scegliere precisamente
quali pesci prendere.
Dovrei avere avere nella vaschetta una F e un M.
Ma da ieri mattina nessun segno di giochi amorosi,tra un po le rimetto
nell'acquario mi sa!