@nameless, @Googoltarian - dose-wise I wouldn't go over 4mg because of
a) there's an unpublished study out where 4mg was enough to significantly alter physiology in the test group (positively that is, see:
http://tinyurl.com/d4ps85d ) and
b) Astaxanthin belongs to the carotenoids group; taking too much of one type might lead to washout of other important nutrients (a bit like Alpha Tocopherol can lead to washout of Gamma/Delta/Alpha and Beta variants).
c) don't take any kind of carotenoid if smoking (then again if smoking why not deal with that instead taking vitamins, I digress) since it may lead to added risk of lung cancer occurrence. Finally, I personally feel sickly from taking more than 4mg a day.
On the topic of absorption/dose its worth noting that the compound is highly lipid soluble: i.e. the fish oil combo might be good for several reasons...