The answer is "no". Moreover, Akismet is catching all the spam so what's the issue? Akismet is the filter for preventing spam from appearing on your blog, and it works very well. Believe me when I say the amount of spam on WordPress.com blogs is diddly squat compared to what we get on self hosted WordPress.org installs.
The vast and overwhelming majority of all so-called information on the internet is spam. Over 80% of all comments submitted to .wordpress.com blogs every day are spam.
If Akismet has sequestered these spam comments simply click "empty spam" button.
If you get spam that slips by Akismet then mark it as spam (do not delete it) and over time Akismet will learn it's spam.
On the spam that Akismet catches it takes only seconds to click "empty spam" and you don't even have to click "empty spam" if you don't want to. Akismet will maintain comments it has caught for 15 days from the time they were received, and then it will delete the comment automatically.
For more information please take the time to read "5 things every blogger should know about spam" on this page Akismet: How it works http://akismet.com/how/