On WorldTunaDay, learn more about the secret behind a tuna's sharp turns.
Bluefin tuna can stretch 3 meters, weigh a metric ton, and reach speeds of 60 kilometers per hour. Yet they still turn on a dime when hunting, thanks in part to their lymphatic systems. Unlike humans, who use their lymphatic systems to produce and transport white blood cells,. When scientists dissected the nimble fish, they discovered empty cavities at the base of their second dorsal and under-belly fins.
These vascular sinuses are connected to a network of vessels that extend into the fin, between the bones that make up the fins' rays. When the team pumped a saline solution into the vascular sinuses of recently deceased tuna, the solution flowed into the vascular channels and increased the fins' internal pressure. This caused the fins to rise and stand erect from the body.
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