What's the best ELISA kit to detect FSH levels in mice?

I am trying to find a reputable ELISA to measure FSH as well as LH levels in wild yellow perch plasma; however, it is difficult to know which manufacturer to choose and little is in the literature using commercially available kits. I am a PhD student with limited funds, so I am hoping to get some direction from the scientific community. I realize that they are using developed using model lab fish and may not work on my species but after trying one kit and discovering that it was bogus, I am hesitant to waste sample, time, and money on attempting another validation without some guidance. I appreciate any suggestions!

Best regards,

-Alex