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Oryzias spp.
September 28, 2011
2:38 pm
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Matt
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Does anyone have experience with species other than O. latipes, O. woworae or sp. 'Kendari'?

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September 28, 2011
2:44 pm
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Colin
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I had mekongensis for a while but didnt keep them long term, maybe a couple months?

September 28, 2011
3:40 pm
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Matt
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Any breeding activity?

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September 29, 2011
11:27 am
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coelacanth
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O. cf. celebensis, O. nigrimas, O. sarasinorum, O. sp. Sulawesi, O cf. mekongensis. We never had fertile eggs off the Mekong fish, the Celebes medaka breed like a typical member of the genus, egg clusters which are deposited on plants before they hatch. The nigrimas are a much more elongate fish (similar to ex-Xenopoecilus), very nice, they seem to hold on to the eggs a little longer. The sarasinorum (previously Xenopoecilus) carry their eggs to hatching, as do the O. sp. Sulawesi (these are very interesting, body shape is more like an Oryzias sensu stricto but behaviour is much more like a "Xeno").

September 29, 2011
12:17 pm
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Matt
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Great info, thank you sir. /thumbs_up.gif" style="vertical-align:middle" emoid=":thumbsup:" border="0" alt="thumbs_up.gif" /> Think I remember seeing the O. sarasinorum when Dunc and I visited?

Don't suppose anyone recognises this one? The photos were labelled O. javanicus but don't think that's correct?

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September 29, 2011
12:38 pm
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coelacanth
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QUOTE (Matt @ Sep 29 2011, 01:00 PM) < {POST_SNAPBACK}>
Don't suppose anyone recognises this one? The photos were labelled O. javanicus but don't think that's correct?

O. dancena? "Males have some anal-fin rays extended as white-tipped filaments.", "Oryzias dancena is distinguished from all other Thai species of
Oryzias by the white distal margin of the anal fin in both sexes"

September 29, 2011
2:20 pm
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Matt
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This is the one I was sent labelled O. dancena, looks very similar to the above but with white-tipped ventral fins...

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September 29, 2011
2:50 pm
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coelacanth
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I'd be tempted to say the only difference there is age.

September 29, 2011
2:53 pm
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Matt
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Cool, that's what I hoped you'd say. /tongue.gif" style="vertical-align:middle" emoid=":p" border="0" alt="tongue.gif" /> This one should be O. javanicus methinks:

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September 29, 2011
3:04 pm
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coelacanth
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It's a young male, whatever it is. Don't see the suggested black edge to the anal that javanicus supposedly has, will look further.

edit - according to Parenti the black line should be along the anal fin base, hard to tell on that pic.

September 29, 2011
3:33 pm
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Matt
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Here's another pic with what appears to be a black submarginal band on the anal fin just about visible. Looks like the same species as the one above?

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September 29, 2011
4:58 pm
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coelacanth
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QUOTE (Matt @ Sep 29 2011, 04:16 PM) < {POST_SNAPBACK}>
Looks like the same species as the one above?

Aye, and the caudal pattern fits with that described for javanicus. Maybe aff. or cf. javanicus?

September 29, 2011
5:00 pm
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ricefish
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September 29, 2011
5:12 pm
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coelacanth
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Look more like celebensis to me, or at least what I know as celebensis.

September 29, 2011
5:17 pm
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ricefish
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The stripe is more purple than the pic's show
but I'm sure you're right about them being celebensis

September 30, 2011
7:50 am
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Matt
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My first thought was O. celebensis too...though it's odd the orange stripe above the anal fin isn't mentioned in any of the papers I've seen since it does appear to be a diagnostic character?

The purported O. javanicus in the pics above were collected in Singapore which should confirm the id?

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October 12, 2011
12:16 pm
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Matt
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Does anyone have any information regarding the amount of time females carry eggs for and subsequent incubation periods for the different species? As things stand we specifically need details for the following:

O. celebensis
O. dancena
O. javanicus
O. latipes
O. mekongensis
O. minutillus
O. sarasinorum
O. songkhramensis

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October 13, 2011
1:58 pm
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Matt
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Ooh, look at all the pretty colours!

Sigh...

Edit: unbelievably, I've only a single, small image of O. latipes. Can anyone can help with more? Pics of both natural and ornamental forms would be great.

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October 13, 2011
2:18 pm
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coelacanth
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QUOTE (Matt @ Oct 12 2011, 12:59 PM) < {POST_SNAPBACK}>
Does anyone have any information regarding the amount of time females carry eggs for and subsequent incubation periods for the different species? As things stand we specifically need details for the following:

O. celebensis
O. dancena
O. javanicus
O. latipes
O. mekongensis
O. minutillus
O. sarasinorum
O. songkhramensis

It might be that we can persuade a student to do some proper studies on O. sarasinorum, I've seen courtship but never actual egg-laying/copulation/clinching/wild fandango/whateveritisthattheydo, so development periods are not known.

October 13, 2011
6:15 pm
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Mark Duffill
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I used to have celebensis, latipes and minutillus all spawning groups aswell, unfortunately this was pre digital camera and I didnt get any photos of them.

minutillus were probably easiest to get spawning, I used to keep one male with two females in 2 gallon containers on a window sill with just a big clump of java moss. bred like rabbits and never seemed to bother the fry which were like slivers of glass on the surface when first hatched after around 5 to 7 days. Females would carry eggs that looked more like huge bunches of grapes /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" />

I picked up a group of small woworae on Tuesday that were already depositing eggs in the java fern roots this morning

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