How can I determine the gender of Neon Tetras?
In my aquarium are some Neon tetra.
I'd like them to breed, but I don't know if they can because I can't determine their genders.
After careful observation, I can identify some females (they have a larger belly). Are there characteristics to help me tell which is which?
Great photo! The source link leads right to the uploaded image, do you have the link available for where you found it on Wikipedia?
The male is slender and the blue line is straighter while The female is rounder producing a bent blue line.
Mostly, the males are bigger than females
Generally I've heard that males are *smaller* than females. E.g http://www.seriouslyfish.com/species/paracheirodon-innesi/
@toxotes Really, I heard the opposite. E.g http://wiki.answers.com/Q/How_do_you_tell_the_difference_between_male_and_female_neon_tetras#slide2