A.Inca sex ratio

[Daniel L]

I bought about 12 A.sp.Inca (randomly selected) and I was wandering about the sex ratio and determination and occurence in nature.

My specimens are about 1½-inch long. Since they're hi-finned, females are hard to distinguish from males, based on the early elongation of the first spines on the dorsal fin. The only way I was able to tell males from females, up to now, is by looking at the fins where the males have the typical nijsenni-coloured orange band in the caudal. Are sub-dominant males coloured like females for this species or is there something else I am missing that I should look at? Because if that's the case, I might be stucked with 1 male, 11 females! What a hell (or paradise) for some of us...

Also, does anyone have heard that males are rare in nature for this species?

Thanks for all replies.

Daniel (Quebec City, Canada)

 

[farm41]

Look at the ventral fins, any black coloring at all will indicate that it is female. Both sexes have the red crescent on the caudal fin.


So far all my inca spawns appear to have a 50/50 sex ratio.

I couldn't tell you about what happens in nature.