Curious to know the difference between male and female Columbian sharks. I assume the yellow ones are the females and dark ones are males. but i can't be sure, if anyone knows how to sex them please help.
[video=youtube;dB6O5yM-p8Q]http://www.youtube.com/watch?v=dB6O5yM-p8Q[/video]
Here is a video from another forum member who has a male and female(columbian shark catfish). The female is the larger one and when ready to breed will display a kind of second set of pelvic fins.The main set of pelvic fins on the female also look bigger and lighter in color. All is very well documented by Columbian shark catfish.
I've never heard of them turning yellow. Could you post a pic of yours?. And also I doubt you could sex them by looks at their current size. Mine were identical at that size and I ended up with 1 female 2 males.