By Nicholas Bakalar
Swordfish are among the fastest fish in the ocean, and now scientists may have found at least one reason: The fish secrete a performance-enhancing grease.
Dutch researchers examining two frozen swordfish discovered that there is an oil-producing gland at the base of the sword, connected by capillaries to pores in the skin of the head. The oil is secreted only on the head of the fish, not on its body.
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