Bestand seit (Halter ist der oben genannte Originalautor): 
20.11.2012
Anzahl: 
8.2 8 Males, 2 Females
Nachzuchtgeneration: 
0
Herkunft
Herkunftsart: 
Nachzucht
Haltungsbedingungen
Haltung: 
Teich (sommers)
Überwinterung: 
Kühl: unter 15°C
Ernährung: 
Fütterung, vorwiegend Lebendfutter
Brutansatz: 
Paarweise
Selektion: 
./.

Start einer Übersetzung des englischen Originaleintrags ins Deutsche. Author des Originaltextes und Halter des beschriebenen Bestandes Bestand/2686 ist Fabian en/node/2686
Ei verbibscht ....
erstmal rausfinden müssen, wie ich die Übersetzungsversion erstellen kann, ohne dass die Historie des Originals kaputt geht und im Bestandslisting der Bestand doppelt auftaucht.
Zeit dran verbraucht, auf eigentliches Übersetzen auf Deustch kommt dann beim nächsten mal. ;(

The 10 unsexed fish, at 3,5-4cm were received about end November 2012. They were kept indoors in unheated aquarium, between 15-20*C, but rather at the lower end. Feed exclusively on Tubifex. They were subjected to a cooling down to 10*C in January for 2 weeks, but the temperatures gradually went up to 22*C indoors, before they went outdoors.
Fish went outdoors in April, when night temperatures remained around 10*C. They are kept mainly in round, 90l JOPA Moertelkuebel in pairs. When needed, further separations are made. Outdoors, they also receive some live mosquito larvae from time to time.

Until now, they showed little to zero fertility, 5 spawns resulting in only 7-8 larvae, from a single female (female 2). I tried to narrow the search of the affected animal, and I am almost convinced that the other female (female 1) is totally sterile. She (female 1) also exhibit a very weird behaviour. Not only the embraces are incomplete (maybe male's fault too? did he "felt" something wrong with the female?), but she keeps the light, spawning colouration even after finishing the spawn, for a while. During this time, she behaves very docile and unthreating, and her ondulating, submissive moves (like the approaching ones right before embrace/spawn episodes) soften the male's vigilence, and she proceed to eat a few eggs at a time, repeating the trick until her colour revert to normal- after that, the male is more careful and chase her away, but still not efficient enough to keep her to snatch a few more eggs.

I describe the spawning history here:

1. female 1 x male 1- incomplete embraces, zero larvae.
2. female 1 x male 1- idem. Now decided to try another male.
3. female 1 x male 2- idem.
4. female 2 x male 2- not observing well, but rather complete embraces; though, only 7-8 larvae as a result.
- meanwhile, female 2 affected by dropsy, so not yet trying with another male. Cured after 4 days with Furanol.
5. female 1 x male 2- total failure again.
6. female 1 x male 2- still waiting.

As you can see, the poor female 1 is a quite frequent layer.
Next plans:
- female 2 x male 3 (maybe the best-looking exemplar I have, largest and easy dominating male 2 when confronted for a few minutes trial).
- female 1 x another male
- female 1 x male 3

After that, I hope to conclude something more and find the best pairing in order to obtain my own stock.
First real winter for all fish (the much desired youngs and adults) will be cold, but not outdoors; I will let them hibernate in a foil-pond only after I will obtain enough animals. A very cold but frost-free attic, between 2-10*C will be the place. After first frosts, fish will be removed from the tubs to the attic, in their own water. Further water adding/exchanges will be made drop-by-drop, at a very slow rate, avoiding drastic changes in water chemistry when fish are letargic, since some say that it can be fatal. Even so, some say it's not, but I cannot yet test that.
..............................................................................

UPDATE 1.07.2013:
Yes, some eclosions finally occured. I took out the female after spawning on 29.06.2013, and let the male alone. Morning 30.06.2013 it started a 14 hours rain, that brought 125l/sqm. Quite a rain, during a bad drought. I decided to take the eggs in the house- anyway, they were very few left, about 15. Maybe the male ate the infertile ones? With some water, I transferred them in a small tank, and they started to hatch today. Some got fungus.

QUESTIONS:
I have the impression that female 1 eggs are a bit smaller than usual. What do you think about that?
Also, it seems that fertility may start to improve? And can I hope they will generally gain fertility after a long, cold hibernation? Is this partial sterility reversible?

During yesterday rain, after taking the remaining eggs, the water level rised fast in my tubs, and I went to check the fish, since I am always affraid of jumping fish. Yes, exactly the female 1 jumped!! She may have sat in rain (soft and acid, compared to my 20 GH and 7,5 pH water...) for a few hours. She looks very bad, but the permanent rain kept her alive. She was not able to keep balance for long, struggling to the surface for air... discolourations and stains, maybe some scratches... She is in 3 cm water, still balance-deficient, but has a good appetite. Hopefully she will recover.
.........................................................................................

UPDATE 2.07.2013:
None of those few hatched larvae survived. There is maybe something wrong with my batch of fish... Can a (maybe) too warm winter cause such a mess to their reproductive capacity? Until further opinions, I personally doubt.
The jumping female 1, their (not really) mother, seems to be better and recovering.

I am puzzled by the problems I have with this batch of fish... When I had the Yangzi form years ago, one single pair produced hundreds of healthy fry each spawn. And they were much less fed than these ones. But... lost ALL of them because of a single mistake. Just before I decided to give some to other people, to build back-ups and spread the fish in the hobby. And the pair was lost next summer to the nightmare Camallanus. End of Yangzi line, and also of M. ocellatus too in Romania. A very tough and rewarding line, but it seems that bad luck was tougher.
With these new ones, it's like I would try Betta macrostoma in 20GH water- but I suspect that the Brunei Jewels would be more productive than this line of Ocellati...
..............................................................................................

UPDATE

So, the 7-th spawn ( female 2 x male 3, on 29.06.2013) had good results in quality, considering the small fraction of recovered eggs. Maybe the male ate some of them, after being scattered by the rain.

After 2 weeks...
8- same female 2 x male 3 pair- about 800-1000 eggs, well fertilised as their previous spawn! At night, some lights in the house maybe disturbed the male, wich started to dislocate eggs and swallowed some of them during "rearranging" in the nest. To be on the safe side, removed the male, wich did a great job during the day, taking the eggs out of sunlight and moving them accordingly, to find the best spot for them. Maybe about 700 left? Hopefully.

This pair proved to be the best way to propagate them for the first year. The only good female (of only 2) and the best male. It worked and I will not change that now, considering the risk of failure if I will try another male, not to mention the exhaustion of the poor female. I will let them to spawn 2 more times, after 2-3 weeks interval between spawns, and then let the female getting stronger for winter.
To maximise the use of this reduced variability, some of their daughters will be paired next year with the other mature males I have. Anyway, inbreeding doesn't seem to affect most of ornamental fish, if the conditions are good- outdoors, sunlight, daily temperature swing, live food, various algae doing their detoxifying job etc.

Water-spitting behaviour of the male 3: I firstly noticed this archer-fish (Toxotes sp.) behaviour when I was getting closer to the nest, trying to observe. I thought it was some defense/intimidation behaviour, but I can't figure out why and against what type of threat did it evolved for. Maybe from the same reason as Toxotes did- hunting? Hitting small invertebrates and bringing them down in the water?
Bad filming skills, dirty glass and greenish water, but here it is: http://www.youtube.com/watch?v=J1YF7Oli8Eo

Kommentare

Kommentar hinzufügen

KEINE WERBUNG! (NO ADVERTISING!)
Werbung wird als SPAM behandelt und automatisch an BLOCK-Listen gemeldet. (Advertising gets automatically treated as SPAM.)
(If you're a human, don't change the following field)
Your first name.
Zur Prüfung.
Aber wenn du sicher ein Mensch bist, dann lass das obige Feld leer, trage auf keinen Fall irgendetwas ein! (For verification.
Yes if you're a human with at least basic knowledege, don't change this field, let it empty in all cases. )
Der Inhalt dieses Feldes wird nicht öffentlich zugänglich angezeigt.
  • Verwenden Sie <bib>Signaturschlüssel</bib> oder [bib]Signaturschlüssel[/bib] um automatisch nummerierte Verweise auf Veröffentlichungen einzufügen.
  • Internet- und E-Mail-Adressen werden automatisch umgewandelt.
  • Zulässige HTML-Tags: <a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd>
  • HTML - Zeilenumbrüche und Absätze werden automatisch erzeugt.
  • Sie können mittels der Wiki-Syntax [[ZIEL]] oder [[ZIEL|ZUZEIGENDERTEXT]] Links zu Web-Seiten eingeben. Beispiele: Interne Seiten über Seitentitel: [[Macropodus ocellatus]]; Interne Seiten über URL: [[Macropodus/ocellatus|Rundschwanzmakropode]]; Interne Seiten über Taxonomie: [[Macropodus ocellatus?tax|Rundschanzmakropdenbeiträge]]; Link zu externen Seiten: [[http://tolweb.de]] bzw. [[http://tolweb.de|Eine gute Taxonomieseite]].
  • Use to create page breaks.
  • Text-Smileys werden durch Grafische ersetzt.
  • Use [fn]...[/fn] (or <fn>...</fn>) to insert automatically numbered footnotes.
  • Web page addresses and e-mail addresses turn into links automatically. (Better URL filter.)

Weitere Informationen über Formatierungsoptionen




Wissenschaft ist der Glaube an die Unwissenheit des 'Wissenschaftlichen Konsenses'. {frei nach Richard Feynman}