yeastfarts.com

So for some time I had been under the incorrect impression that my clarifying agent of choice, whirlfloc, was made from the processed swim bladders of fish.  Turns out that whirlfloc is not only similar to irish moss, it is irish moss that has been processed and turned into tablet form for ease of use.  It's worth mentioning that I'm not completely crazy with regard to the swim bladders.  They are processed into a clarifying agent called isinglass.  Isinglass is the reason that some beers, notably Guiness and other beers of British and Irish origin, aren't vegetarian or vegan compliant... if you happen to care about such things.