Danios: Behaviour and appearance questions

On the coloration of your Zebras... the males have a silver tone to
them while females have a golden tone between the black lines. You will
notice as they get larger, the females will become increasingly
aggressive towards the males and they will become more gold in color
and very wide. Sometimes they can be double the size of the males. A
larger group will cut down on the aggression.

On your leopards, there is a gold variety, a regular variety and a blue
variety. There is also a long finned variety, just like in Zebras. If
your fish are more gold then silver, you probably have gold leopard
danios.

Leopards (brachydanio frankei) and Zebras (brachydanio rerio) are two
different species, so they will not breed. Although, I am sure there
are hybrids; they will be more likely to breed with their own species
first. Golden zebra danios, long finned golden zebras, long finned
zebras, and short finned zebras, can all breed together since they are
the same species... just different fancy strains created from specific
breeding. Same goes for the leopard color varieties and tails listed in
the second paragraph.

Thusly " Spake
Unto All:

Leopards (brachydanio frankei) and Zebras (brachydanio rerio) are two
different species, so they will not breed.

AFA is known that is not true. The leopard has never, despite
considerable effort, been found in nature, and is now believed to be a
captive-bred strain of zebra danio, and /Danio frankei/ is today
considered a synonym of /Danio rerio/, with which it will also
interbreed. However, the leopard danio has reduced fertility, which
*might* indicate that it itself is a hybrid between /D. rerio/ and
some other species of /Danio/.

The genus /Brachydanio/ is today considered a synonym of /Danio/,
comprising most of the small species of danios, whereas the genus
/Devario/ comprises most of the big species (e.g. /Devario
aequipinnatus/, the common giant danio).

Also, FWIW, I do not recall ever having seen a silver or blue strain
of leopard danio or zebra danio. I have seen albinos & partial
albinos, though.