Read more here
http://blogs.smithsonianmag.com/food/2013/03/hey-vegans-there-may-be-fish-bladder-in-your-guinness/
Shared by Dr Stremme via Facebook.
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Yours sincerely,
Dr Richmond Loh
BSc BVMS MPhil MANZCVS (Aq & Pathol)
The Fish Vet, Perth, Western Australia.
Veterinary Medicine for fish.
W: http://www.thefishvet.com.au
E: thefishvet
P: +61 (0)421 822 383