Re:Biomedical companies bleed 500k horseshoe crabs a year
by saganus on Monday April 17, 2017 @12:32PM
(#14132218)
Just for the tl;dr:
"Overall mortalities of bled horseshoe crabs were 17.8% (male = 18.75%; female = 17.2%), while mortalities of unbled crabs were 3.5%."
So it appears it indeed affects the crabs.
I agree that the benefit for humans is there, but it's often times a bit more than than just 'momentary discomfort' for the crab[0]
[0]: http://www.tandfonline.com/doi/abs/10.1080/10236244.2011.642...