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Apistogramma spp.: size differences between males and females
October 15, 2012
11:09 am
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Jakub
Lutterworth, UK
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Do males of apistogramma spp. tend to be bigger than females? I have been looking up several species on internet sites (Bored and waiting for my first tank for years Smile),and noticed some discrepancies between SF knowledge base and fishbase.org.

For instance:

  Seriously Fish fishbase.org
Apistogramma hongsloi m-5, f-3.5 m-3.4, f-5
Apistogramma trifasciata m-6, f-4.5 m-3.8, f-4.6

 

Fishbase.org in both cases quote:

Kullander, S.O., 2003. Cichlidae (Cichlids). p. 605-654. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil.

as the source. Perhaps someone can shed some light on this (plus is there a general rule one way or another, or does it vary with species).

Thanks

Jakub

October 15, 2012
1:17 pm
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coelacanth
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Fishbase would use data from specimens that were collected and preserved for scientific study, so if someone happened to only manage to collect small males that is what would appear (however, in this particular case I'd say there has been an data-input error, and the figures are the wrong way round, as I've never seen females of either species get to those sizes). SF will use information from long-term care of the fish (or extrapolation from closely-related species) to give a more realistic idea of the growth potential in the aquarium. Other than a very few obscure species (and even here it's dubious), male Apistos get significantly larger than females.

October 15, 2012
2:58 pm
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Jakub
Lutterworth, UK
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Thanks for the reply. One of the things that in my mind made the possibility of females growing to bigger sizes viable, was that I read somewhere about the need to remove the male after breeding due to female potentially becoming aggressive and bullying the male. I can't recall now which species it was, but perhaps it just comes from the fact that the female guards the eggs and has nothing to do with size.

October 15, 2012
7:27 pm
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Graham Ramsay
Blairgowrie - UK
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Just to add that in my experience having kept and bred both these species A. trifasciata is a smaller fish than A. hongsloi.

October 15, 2012
10:24 pm
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Jakub
Lutterworth, UK
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Hi Graham

Do either of them exceed the sizes above? I will shortly have a 60l tank to stock (so size of fish is a consideration) and have been thinking about a pair or two of Apistogramma plus a small shoal of dwarf nannostomus. Would you say a 60l tank can accommodate two pairs?

October 16, 2012
10:36 am
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coelacanth
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Hongsloi is one of the larger Apistos, potentially quite robust fish, a good male could exceed 6cm S.L.
60l is only big enough for a single pair of Apistos IMO.

October 18, 2012
9:04 am
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Matt
Málaga, Spain
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Ok, looks like some minor editing is needed. Will sort that now.

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