Hrm if they're the same length and one has more weight/fatter, I'd say that's likely a female.
Great poses! The last series really shows his dorsal spines and color to great effect.
Huge difference in sheer mass between those two. Glad to see the little one is eating well and putting on weight. How's long do you figure it will take him to catch up?
O
The smaller one in this picture is one of the two I've had for a long time. I think he will always be smaller because he always has been. My new eel isn't still in my quarantine tank for a few more weeks. He's putting on good weight but still doesn't even begin to compare to these two.
Love these pics and your eels!
Does substrate color make a difference in fish color with eels like it does with bichirs?
She's looking great!
In terms of determining sex, are there any secondary sexual characteristics for fire eels? On my TT, there is a small (approx. 1/8" )protuberance at the genital pore which I read was an ovipositor. It's definitely not an internal breeding tube which extends outward when it's time to deposit eggs, but a permanent external organ.
Anything similar in fire eels? I imagine it would be similar if not the same among the Mastacembelus eels.
Or perhaps someone with experience can chime in on whether what I read was correct?
O