Oryzias woworae - Ricefish

[BallAquatics]

Back in the spring, I picked up a bag of these fish at our club swap meet.  I hadn't really done anything with them until a couple of weeks ago.  I started loading them up on live Moina, added some floating horn wort to their tank and stepped up their water changes.

While I was changing some water this afternoon I noticed a female carrying eggs.   

















All the other girls are plump and should have eggs any day now.  They are pretty cool little fish.  Sort of small and delicate.  They would be great in a desktop nano tank.

Dennis

[Mugwump]

Pretty...those are Neon family aren't they??...

[wsantia1]

Very nice.  Congrats.

[BallAquatics]

Pretty...those are Neon family aren't they??...

I have seen them called Neon Ricefish before, but they are not related to Neon tetras if that's what you mean.  These fish are native to the island of Sulawesi in Indonesia.  http://www.asihcopeiaonline.org/doi/abs/10.1643/CI-09-108

Thanks Willie, it was a very pleasant surprise to find them carrying eggs.   

Dennis

[Mugwump]

Pretty...those are Neon family aren't they??...

I have seen them called Neon Ricefish before, but they are not related to Neon tetras if that's what you mean.  These fish are native to the island of Sulawesi in Indonesia.  http://www.asihcopeiaonline.org/doi/abs/10.1643/CI-09-108

Thanks Willie, it was a very pleasant surprise to find them carrying eggs.   

Dennis

Thanks, that's likely what I've seen somewhere too...??

[sschind]

Back in the spring, I picked up a bag of these fish at our club swap meet.  I hadn't really done anything with them until a couple of weeks ago.  I started loading them up on live Moina, added some floating horn wort to their tank and stepped up their water changes.

While I was changing some water this afternoon I noticed a female carrying eggs.   

















All the other girls are plump and should have eggs any day now.  They are pretty cool little fish.  Sort of small and delicate.  They would be great in a desktop nano tank.

Dennis

If I am not mistaken those little buggers were about $8.00 a piece on my wholesale list a couple of year back when they first hit.  Pretty but expensive.

[PaulineMi]

Super pictures Dennis.

[BallAquatics]

Thank you Pauline.

Dennis

[b125killer]

There neat Dennis. Do they carry there eggs until they hatch?

[BallAquatics]

No they will brush them off onto some plants and then have more in a day or two.  They have only been in the hobby for the past 3 years so there's not a whole lot known about them.  It is believed that the eggs are fertilized internally and remain there for a while before exiting the female and then being attached to plants.  From what I've read it takes from 1 to 3 weeks for the eggs to hatch.

Dennis

[BillT]

Cool fish. I like the name, Wow!-orae.

[Ron Sower]

No they will brush them off onto some plants and then have more in a day or two.  They have only been in the hobby for the past 3 years so there's not a whole lot known about them.  It is believed that the eggs are fertilized internally and remain there for a while before exiting the female and then being attached to plants.  From what I've read it takes from 1 to 3 weeks for the eggs to hatch.

Dennis

The 1-3 weeks works for me.  That's the way I noticed the fry appearing last summer.

I'm trying to figure out how they could have internal fertilization...there's no gonopodium on the males.

[BallAquatics]

I'm trying to figure out how they could have internal fertilization...there's no gonopodium on the males.

Not sure where I read that.....  Seriously Fish says, "The adhesive eggs are typically expelled as a single mass and fertilized simultaneously.....", so maybe they are not fertilized internally.  I haven't noticed the males paying special attention to the females carrying eggs.

http://www.seriouslyfish.com/species/oryzias-woworae/

Dennis

[BillT]

The research medaka (Oryzias latipes) is fertilized externally.
It is the Japanese equivalent of the zebrafish for research purposes.
External fertilization is very handy for research purposes.