If I had to guess I would say the fatter one is female, carrying the eggs within her giving her the larger thickness.
My local Cuban and Tropical gar breeder (or so he says) told me he determines gars sexuality through interactions between them. Males will nudge around the anal fin area of the female, notifying the female he is ready to mate. He said there is no outer distinctions besides the thickness of the fish which can determine their sex, only when they become mature does he sex them through that method.
He told me however, females generally are thicker towards the back while males are slim (slimmer) down their entire bodies.
Yeah they need to be a few years old right?first of all, do you know their actual age? One might be just fatter because it eat more than the other(look to be a fat gar like many other I've seen in the forum).
first of all, do you know their actual age? One might be just fatter because it eat more than the other(look to be a fat gar like many other I've seen in the forum).
Gars may chase just because they are new together. My larger Tropicals chased around my Floridas for the first few days, and then they settled in.
Also my gars showed breeding behavior and they are under a year old, so the behavior may be a poor indicator on age and/or sexual maturity.