I just got this Jack about a week ago. It is about 2 inches, 1.5 without the tail. From what I have been able to find online, the rounded fins and large amount of blue color on the underside of the gill plates suggests that it is female. However, I have also read that these methods are not very reliable any more and sexing is especially difficult for babies. I have a male and female name picked out but I'm kind of held up because I don't know which it is. Does anybody know anything on this subject that I don't or can anybody sex it? Thanks