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Tem­per­a­tures ? sea­sonal cycles?

  • VAN BESIEN Hugues
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8 years 3 months ago 8 years 3 months ago #565 by VAN BESIEN Hugues
Tem­per­a­tures ? sea­sonal cycles? was cre­ated by VAN BESIEN Hugues

What water tem­per­a­ture are you giv­ing your paros ? and how do you let them change?

I know from expe­ri­ences with other black water and/​or for­est dwelling fishes (microctenopoma, lit­tle red bet­tas) that in these shad­owed places, the tem­per­a­ture of water is not so high as one can think, and that the indi­ca­tion given in the aquar­is­tic lit­er­a­ture show too high tem­per­a­tures (2526°), so I give rather 2223°, and in par­tic­u­lar cases nor lower tem­per­a­tures. It make fishes live longer.

I know too that too long time with even tem­per­a­ture don’t respect bio­log­i­cal cycles and that change, for exem­ple, can induce spawn­ing.

Paros are for­est dwellers, but are to be found near the line, where sea­sonal changes are weak and tem­per­a­tures the high­est.

I usu­ally have my paros about 2324° C, and it can be that in the sum­mer, it goes higher about 2526° or even more for a short time. It’s clear that spawn­ing is sea­sonal, that is, there are time for spawn­ing, and time for not spawn­ing, but I can see no pos­i­tive bind with tem­per­a­ture or actual sea­son, and there is long not-​spawning-​time.

Now, and since a few mon­thes, none of my 4 species does seem spawn, although my water para­me­ters are at best, bet­ter than sooner

So, I make the tem­per­a­ture higher and won­der if I should not intro­duce a night /​day tem­per­a­ture change, per­haps 12 °, by cou­pling heater and light

So what to think about?
Are paros all the year spawner like many equa­to­r­ial species?
Are there dif­fer­ences between paro species? Sea­sonal and not sea­sonal? Dry sea­son or not?

Hugues (Douai, France)
Last edit: 8 years 3 months ago by VAN BESIEN Hugues.

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8 years 3 months ago #568 by PatrickG
Replied by PatrickG on topic Tem­per­a­tures ? sea­sonal cycles?

Today fishes are kept under sta­ble, warm con­di­tions. In early days of aquar­is­tics nearly all species where kept in colder water than today, espe­cially in win­ter. Dur­ing the cold period, the fishes had the chance to recover them­selves. This was right and impor­tant for sub­trop­i­cal fishes — but is it healthy for trop­i­cal fishes? I dont know.

I keep my Paros at 2223°C and they spawn per­ma­nently.
I dont know if 2223°C are the temperature-​optimum of that species, but it works.


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  • Peter Finke
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8 years 3 months ago #573 by Peter Finke
Replied by Peter Finke on topic Tem­per­a­tures ? sea­sonal cycles?
We have very lit­tle real knowl­edge on this tem­per­a­ture issue, I am afraid. What you both tell us, Hugues and Patrick, is surely cor­rect. There is quite a lot of infor­ma­tion on aquar­ium prac­tices, but the infor­ma­tion on the liv­ing con­di­tions of Parosphromenus in nature is rather lim­ited. There are reports on habi­tats with rather low tem­per­a­tures, and there is the con­trary, espe­cially if the canopy of the wood is open or even miss­ing. We should ask the friends in our Asian-​section!! Will one of you do that? That would be fine!!
As the aquar­ium is con­cerned, I pre­fer the low-​temperature-​variant, with some­times 21, but mostly 2224 degrees Cel­sius. I have never seen a remark­able increase of courtship and egg-​laying after a temperature-​rise, only after a good water-​change or a change of food. The expe­ri­ence of Hugues that the pairs often have long inter­vals with no courtship and spawn­ing beetween long peri­ods of spawn­ing seems to be quite nor­mal in this genus. We have to make clear that in nature most of these fish live at the longest one year, and that there is only one spawn­ing period for them. What we have in the aquar­ium — no ene­mies and always good food and three or even more years of sev­eral spawn­ings — is quite unnat­ural for them. We cer­tainly should try to get off­spring by one of the first spawn­ings of them, but often that is impos­si­ble.
It would be inter­est­ing to hear from oth­ers how they think about that tem­per­a­ture question.
The fol­low­ing user(s) said Thank You: Boris

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