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A comment on Biomedical companies bleed 500k horseshoe crabs a year. Parent comment
"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.
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"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.