Question

w what are the veins in fishes that bring
blood from the fins​

Answer 1

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For blood sampling, the preferred sites are the caudal vein (from either a ventral or a lateral aspect), cardiac puncture (ventrally), or the brachial plexus (caudal to the gills). Notably, the blood volumes in fish are small compared with those of mammals, being c 5% of the body weight.