[Killietalk] Diapterons: defect genetic or enviroment

[Miguel Angel <misaher at yahoo_es>]

I keep for two years Diap. Georgiae 95 Essongville without problems. They spawn, hatch well the eggs and they developed more or less normally. I also have Diap. Cyanostictum from 2006 november.  
    
Some young of georgiae and cyanostictum that was born at 2006 November are "short". The aspect of the fish is like an adult but its form is like if we compress it the length, keeping the height. More or less their length is around 2-2,5cm. They are healthy but abnormally short. They reminds me when years ago a friend talk me about the killis  "bonsai".  
    
Reading something of information that there is at internet, somebody  attributes to low temperatures during the juvenile time the fact that they cut  the growth and stay small. Other attributes it to the inbreedings with brothers. It says to the increase on infertility and the fish to stay small.  
    
Those born in November are the first generation of reproduced Diap. georgiae. The cyanostictum comes from some eggs that a friend give me. The hypothesis that the low temperatures causes "dwarfism" can be true because some georgiae from  2006 June (first generation) are perfect.    
  
As control group I have some georgiae fry (2ª generation) and fulgens (1ª generation) that were born me in March. For the moment, their aspect is normal, lengthened and fine. We will see that it happens when I breed the "short" cyanostictum and georgiae. I will see that it occurs to the fry; if they "dwarfism" is heredity or if they will have a good development. I must maintain the temperature since they born at 23-24ºC. to discard the influence of the low temperature.    
    
    
Did somebody happen something similar? Up to now I never see on  my breeding killis  symptoms of "dwarfism". It is certain that the fish developed in small aquariums usually have less size than those that have grow in big aquariums. But this affects to the general aspect and the obtained fish are proportional and not compressed lengthwise.    
    
Any comment is appreciated  
    
Best wishes from Spain   
Miguel Angel Saiz    
www.misaher.es


       
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