Rivulus spec. "Mahdia"

[Svein]

Hi all

Just wonder if someone have any experience with this species. Primary I'm thinking about the water parameters. I'm not satisfied with the breedingresult, but the behavior in the tank is well.
Regards
Svein

[BeyondGomer]

I can offer you no help but wanted to say that those are beautifuy fish!

[Manuran]

Hi Svein,

The water needs to be on the soft side and warm ( Close to 80 degrees F.)
Some tannins in the water wouldn't hurt. They breed well in mops in shallow tanks. Lastly, try to raise as many fry as you can using the parameters above, as this species tends to give you mostly males. Good luck.

Chuck

[ruyle]

Somewhere I've posted this pic by Chuck Nishihira, but here it is again:


Gorgeous fish, indeed!

Bill

[ruyle]

And by the way, Chuck, welcome! Great seeing your post!

Regards,

Bill

[keehoe]

Hi Chuck, haven't seen your posting/ email for ages. <---- markc

[CM Media]

Hi Chuck,

Nice to have you with us. A big Welcome

[keehoe]

It is very beautiful..... (My killie finger itchy again...)

:P.....

[stormhawk]

Yes welcome to the forum Chuck.

The Riv. sp. "Mahdia" is a nice one but as Chuck has mentioned, gives out more males than females. Apart from this species, Rivulus sp. "Paryagi" is another beautiful undescribed species.

[Svein]

oooops, see that the thread became a welcome thread, so I have to welcome you too Chuck, and thank's for the recommendation, My wather is very soft, and the ph standing at 6.2, and the temperature has been too low I see, so I will raise the temperature.
I use real good peat and oaks leafs, so the tannins should be ok.
regards
Svein

[TyroneGenade]

I'm told that Riv. xiphidius requires at least 24°C to breed and also produces mainly males, but will produce more females in softer cooler water. My xiphidius are currently spawning at 20°C... Do some experiments and see what happens. These fish (Rivulus) seem very adaptable.

I would love to give sp. Mahdia a crack...

Regards

[ruyle]

oooops, see that the thread became a welcome thread, so I have to welcome you too Chuck

Sorry, Svein, didn't mean to hijack your thread, but wanted to welcome a
friend!

Good luck with these beautiful fish,

Bill

[ruyle]

I would love to give sp. Mahdia a crack...

Regards

Me too, and I'm happy to see that they will breed in warmer water. All of
us who live in warmer climates or will be (me) have followed KL's chiller thread with rapt attention. It's nice to know we can keep some species
that are a bit more forgiving to warmer temps. Having chillers for each
tank would be expensive

Bill

[Manuran]

Thanks to everyone for the warm welcome.

Svein, yes please experiment, but I think you will find the most (if not the only) females are produced when the water is warm and soft. The eggs are fairly large and so you don't always find a lot. I think at first it would be wise to go with conditions mentioned above. You'll be happy to know that the fry are easy to raise, so you should see no problem.

If your photos are of your male/s right now, then I think possibly your animals are still a tad bit too young to produce eggs. Yes, sp. Paryagi, is a very nice unidentified one also from Guyana. It is also bigger and doesn't have skewed sex ratios.

Chuck

[TyroneGenade]

Thanks for the info Chuck. That is very interesting that sp. Mahdia and xiphidius have such different biologies. Are they closely related? Have you any experiance with frenatus?

Regards