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Hydraulic control of tuna fins: A role for the lymphatic system in vertebrate locomotion

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Jul 25 2017

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Vadim Pavlov, Benyamin Rosental, Nathaniel F. Hansen, Jody M. Beers, George Parish, Ian Rowbotham, Barbara A. Block

ScienceĀ  21 Jul 2017:
Vol. 357, Issue 6348, pp. 310-314
DOI: 10.1126/science.aak9607

Abstract
The lymphatic system in teleost fish has genetic and developmental origins similar to those of the mammalian lymphatic system, which is involved in immune response and fluid homeostasis. Here, we show that the lymphatic system of tunas functions in swimming hydrodynamics. Specifically, a musculo-vascular complex, consisting of fin muscles, bones, and lymphatic vessels, is involved in the hydraulic control of median fins. This specialization of the lymphatic system is associated with fish in the family Scombridae and may have evolved in response to the demand for swimming and maneuvering control in these high-performance species.