Rivulus cryptocallus

[Pconnieae]

Hi all,

I'm looking for information about Rivulus cryptocallus. Has anyone here raised this species?

[whuntley]

I had them several years back. IMHO, they are one of the prettier Rivs.

I bred them in a 5G tank that had a lot of Java moss, but not a lot of light. I liked their green irridescence from room light coming in from the side glass, so subdued top light seemed like a good idea. Easy fish with big eggs that they dumped into floated mops. Tight covers are mandatrory or they will go "walking." They get big for a Riv.

I think I just moved mops to a hatch-out container with water similar to the parents, for the eggs to hatch. I fed babies and parents a lot of bbs, but the parents got worms, flakes and anything else I was feeding my adult fish.

I vaguely remember they would not take flakes from the LFS, but I had some high-grade Sanders BS flakes they would eat (all my killies would eat those or the ones from BS Direct).

Wright

[Pconnieae]

Thanks Wright.
Do you remember how long is the incubation period?

[whuntley]

Thanks Wright.
Do you remember how long is the incubation period?

About 2-3 weeks, as I recall. A bit longer than other Rivs, I think.

Wright

PS. Since my memory is my second-shortest thing, don't take that as gospel.

[timebomb]

I had the Rivulus cryptocallus once. They came as eggs from a friend living in Brazil. The eggs hatched half an hour after arrival and I got quite a good number of fry. They're tough fishes so I managed to raise all of them without any casualties. I've never collected eggs but a few fry appear in the tank. I saw an egg once and it was huge, much bigger than a Notho egg.

Unfortunately, I lost all of them through Camallanus worms. I still have some pictures though.

Here's a female


The male has a blue sheen on its body


If you look closely, you can see a worm sticking out from their vents. At that time, I didn't have levamisole so the fish eventually died.

Loh K L