[mikev]

S. breviventralis name has been used for more than five years now to denote a mix of Sew0203 and Sew04.

The difference between Sew02 and Sew03 is not to be understood by mere mortals, it belongs to the faith domain. 😛

[mikev]

Shrimp would be far more dangerous than snails.

(I have snails in both lineolata and spotted tanks and they do not appear to have any negative effect).

[mikev]

I hope you would not say ‘two males’, these two were behaving in an interesting way today.

===>>>> https://www.youtube.com/watch?v=SymUFHCCMiY&feature=youtu.be

[mikev]

whew

[mikev]

btw, per your suggestion, I looked at GBIF. no Beaufortia data but a danger sign: “Beaufortia” is a name used for some Australian plant too, so someone will get renamed when this is noticed….

[mikev]

It is very nice… the problem is that the data points are so few that it is not possible to know if b.k.g and b.k. areas come close to each other or not… this is what i wanted to know specifically. but as a scheme this is great.

[mikev]

NO. 🙁 🙁 🙁

I’m shocked but there is no useful data for b.k or b.l on fishbase. Scrap it. Damn.

[mikev]

OOOPS!

One more thing:

TDS/Conductivity:
Tap Water Parameters: Ph 7.7-8.0

go and measure TDS before doing anything. With your pH, it may be high enough to kill these danios, no disease needed.

[mikev]

Thank you guys! You are really professional!
Next question is what to do now? Shall I take out everything and wash the tank? For the remaining “healthy” danios, shall I quarantine them?

I’d follow what Bill suggested and simply watch and remove the dead fish for a couple of months.

I’d not go into nuking the tank at this point.

The reason is that we did not diagnose the problem. Both possibilities we mentioned are only guesses. It may be something else altogether, like chemical poisoning … I had a case of losing fish slowly due to a piece of ceramics … took a long time to figure this out … cases of bad tap water are not uncommon too. And there are other possibilities.

Now, if it is mycobacteria or microsporidia .. the former is difficult to treat, I’m not sufficiently familiar with the latter to know if it is possible to fight it or not (Bill? — any comments from you on this?). BUT: both diseases are specific to some types of fish. Loaches for example are immune to myco … dario may be too… shrimps of course are too… so you can run the tank, just do not add cyprinids or any myco-sensitive fish to it and the fish you have now will live normal lifespan.
microsporidia — well, you need to know exact species of the pathogen for an informed decision — but overall the chances are that it will not affect anything but cyprinids.

(I hate suggesting things like this… but if you were to try small rainbows in this tank … if you see them going the way of danios, this is probably mycobacteria, if you see them doing fine, this is NOT myco for sure.)

As for the danios you have left: they are probably doomed either way… you can try curing them from mycobacteria … but do this in another tank. I can give you a link to treatment discussion and a successful case.)

[mikev]

It is very common in rainbows and *usually* is indeed linked to lesions or ulcers. But usually does not mean always, and in other types of fish it often has no lesions but rather loss of weight and spinal deformities as symptoms… or in a smaller fish like the poster has it may be symptomless.

additionally, loaches, corydoras and plecos are usually immune … dario I’m not sure about.

barbs should not be immune so I’d expect them to croak too (but this would likely be the case with microsporidia as well).

---

BTW, there is yet another possibility here: these barbs are allegedly peaceful…. but I would not totally exclude them harassing small danios to death.

[mikev]

All right, assume what I have to be annamia then. I cannot take photos of them (they run like plague from the flash) but this clip shows five :

https://youtu.be/XOiw_I_GT8g

last pattern (Vietnamesische Giraffenschmerle — I likes) is interesting… reminiscent of the adult panda loach .. but this is likely a false match.

thinking about phylogeny tree: of course speculative in the absence of DNA data for annamia, but I think the following is true:

closeness to vanmanenia is likely false.

otoh, annamia is likely related to hemimyzons, specifically look at the photos of Hemimyzon yaotanensis posted yesterday and compare the fin shapes.

this is not to mean that it is related to all hemimyzons, this is likely not a well formed genus.

via the hemimyzon direction, it is related to jinshaja and sinogastromyzons.

and i’m not convinced that annamia normani is one species.

[mikev]

Consistent with mycobacteria too.

[mikev]

classic what?

patterns like this abound… even disparis is somewhat like this…..

[mikev]

We can do one more thing that may help… map b.k, b.k.g and b.l
for example, b.k.g :

http://www.rainbow-fish.org/fishpic/bkg.tao/map.png

[mikev]

@olly said:

Looks as annamia.

could be.

One thing that bothers me : I have “Homaloptera sp. Vietnam” which is believed to be annamia, as well as (one 🙁 ) annamia normani.
Both are 2″, kept and fed for sufficiently many years to know this is the limit. This is a 4″ species.

one more thought here: the key may be the shape of the caudal fin. Vanmanenia and Crossostoma are diggers, this fish has a forked tail which does not seem capable of digging… so annamia is the first guess indeed.

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