While most people commenting on this thread probably know more than me about Jaguars, let me just highlight one problem: When you reply to a thread like this with one word "MALE" or "FEMALE" it really doesn't help a lot.
My attempt:
I think one of the more easily identifiable characteristics of a Male Jag at that size is the presence of spots on the lower "jaw" and below the lateral thick line of larger spots.
In Female Jags, there are little or no spots below the line of thick line of larger spots.
There are other pointers (like ends of fins and body shape, etc), but I am not a 100% convinced they are always accurate or easy to judge.
Going by above criteria: OP's Jag is a Male.
Cheers,
Sid
PS: While there is a possibility my conclusion might be wrong, I just want to request those of you who are more informed to have a similar format to your response.
Thank you