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Our New Discus Tank - VIa

by George J. Reclos

Hemigrammus erythrozonus (Glowlight tetra) Durbin 1909

One of the things that puzzle me every time I acquire a new species is whether there are any differences between the sexes. Keeping Malawi cichlids for such a long time has made it easy for me but what about other species, like Hemigrammus erythrozonus ? Well, when I got them (32 of them to be precise) I observed that not all of them looked the same. Some of them seemed to have a deeper and higher body but I thought this could be attributed to the conditions under which they were kept in the petshop. After keeping them for more than two months, I am sure this is not the case. Indeed, there seem to be two different kind of fishes in my tank. One of them has a slim body with intense white tips on all the fins except the tail and another one with a considerably higher and deeper body which lacks those intense white markings. Those white markings don't show very well on the photos but the difference in the body shape is very clear. The ratio of slim to deep bodied ones is approximately 1:4 and I suspect the slim ones to be males since I have also seen them to show some intraspecific aggression which is never observed among the deeper bodied ones.

Freshwater Photo of the Month - November 2002

The fish in this picture shows a considerably deeper body than the one in the top photo. Both fish don't show any different feeding habits - they both feed well.

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