Proper temperature for d. fiorni ?

[anewbie]

I've been doing some searching on dicrossus fiorni temp range and can't find anything at all that seems reliable. I can't even find good pictures. Anyone know much about this species? Rather get d. filamentosus but fiorni are available.

 

[Apistoguy52]

I've been doing some searching on dicrossus fiorni temp range and can't find anything at all that seems reliable. I can't even find good pictures. Anyone know much about this species? Rather get d. filamentosus but fiorni are available.

For reasonably equal ratios of sexes in fry, 79/80* f. A majority of the fry produced during fish room winter (72-75*f) were female, summertime spawns (78-81*f) produced fish that were near equal in sexes. Nearly all of the WC fish I’ve seen imported have been male, which would suggest mid-high 80’s durning the end of the natural breeding cycle (low water collecting season)

 

[anewbie]

For reasonably equal ratios of sexes in fry, 79/80* f. A majority of the fry produced during fish room winter (72-75*f) were female, summertime spawns (78-81*f) produced fish that were near equal in sexes. Nearly all of the WC fish I’ve seen imported have been male, which would suggest mid-high 80’s durning the end of the natural breeding cycle (low water collecting season)

Thank you - so they require much warmer water than filamentosus; was 'fraid of that.

 

[Apistoguy52]

Thank you - so they require much warmer water than filamentosus; was 'fraid of that.

What temps have you been keeping filamentosis in? If memory serves, they required about the same temperature as foirni to get reasonable sex ratios

 

[anewbie]

What temps have you been keeping filamentosis in? If memory serves, they required about the same temperature as foirni to get reasonable sex ratios

Was debating between filamentosis and forini; @MacZ said 77 was fine for filamentosis which is 10 degree lower than what you suggested for forini.

 

[Apistoguy52]

Was debating between filamentosis and forini; @MacZ said 77 was fine for filamentosis which is 10 degree lower than what you suggested for forini.

77*f is 2* lower than 79*f

 

[anewbie]

77*f is 2* lower than 79*f

I'm sorry for the error; when i originally read your post i saw 89 not 79

That explains the error.

 

[Mike Wise]

This is what I wrote in June 2023:
I haven't kept D. foirni since 1983, but everything I've read says that it needs very acid (< pH 5.8) and extremely soft water (<2° dGH & KH) to successfully reproduce. They are a true blackwater species afterall. I doubt that you'll be successful without these conditions. No one has studied sex ratios in Dicrossus species, so it's hard to say why your breeder had such a skewed sex ratio. They could be like apistos, where the temperature is a dominant influence.

This is a rainforest species so 75° - 80°F/24° - 26°C, like apistos in the same habitat should be normal for them.

BTW this species was discussed under other names: D. sp. Peru (where it does not occur) and D. sp. Rotflossen/Red-fins.

 

[anewbie]

This is what I wrote in June 2023:
I haven't kept D. foirni since 1983, but everything I've read says that it needs very acid (< pH 5.8) and extremely soft water (<2° dGH & KH) to successfully reproduce. They are a true blackwater species afterall. I doubt that you'll be successful without these conditions. No one has studied sex ratios in Dicrossus species, so it's hard to say why your breeder had such a skewed sex ratio. They could be like apistos, where the temperature is a dominant influence.

This is a rainforest species so 75° - 80°F/24° - 26°C, like apistos in the same habitat should be normal for them.

BTW this species was discussed under other names: D. sp. Peru (where it does not occur) and D. sp. Rotflossen/Red-fins.

Ok thanks - yea the tank has an ec of 28 and likely very low ph. It has been setup for a couple of years but more or less unused.

 

[MacZ]

Was debating between filamentosis and forini; @MacZ said 77 was fine for filamentosis which is 10 degree lower than what you suggested for forini.

Both species ranges overlap in the Rio Negro basin, so I would treat them exactly the same.

No one has studied sex ratios in Dicrossus species, so it's hard to say why your breeder had such a skewed sex ratio. They could be like apistos, where the temperature is a dominant influence.

Agree.

This is a rainforest species so 75° - 80°F/24° - 26°C, like apistos in the same habitat should be normal for them.

Also agree.