You would hae to anesthetize them to take blood samples.
你需要麻醉它们取血样.
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Next, anesthetize the female by placing her in the same dedicated anesthetic container.
然后用同样的方法把母鱼放进同样的麻醉池中,过程已经在上面讲的很详细了.
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"The patient must be anesthetized before the operation"