It doesn't look like a silverfish, I run a website dedicated to silverfish control, what you have appears to be a firebrat, or some other similar species. I have pictures of silverfish and firebrats on my website, here's a link to the page the pictures are on if you want to check for yourself, I can't tell you for sure what that bug is because the picture isn't abundantly clear. One last thing that could be a silverfish or firebrat nymph (baby), I say that because of the light color on the front half of the bug in the picture.