There is not a thing you can do from the website in these circumstances. Some basic modifications might help (only display it after solving a Captcha for instance), but it sounds like you don’t want to do anything like that. If your goal is to have it available as plain text on a page that is linked to from the main site, without making further changes, then it can obviously be found by spammers.
Honestly though, it doesn’t really matter. Spam is just a fact of life, and if your email address is something like
email@example.com, it will get spam anyway because that is an obvious email on top of a public domain registration.
So what to do? Just make sure you have a good spam blocker or use a provider that has strong anit-spam measures. Educate yourself (and everyone else you work with) about the dangers of phishing and downloading attachments from people you don’t know. No matter what you do, you’ll get spam anyway.