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

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

doi:10.1126/science.aak9607

Cited by 58 publications

(32 citation statements)

References 38 publications

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“…A no-slip boundary condition was applied at the model surface. Previous numerical results of tuna [13,14,23,24] and jackfish [16] swimming and recent experimental flow visualization of robotic tuna models [25,26] both show that the local flow past the posterior bodies of the fishes/model was converging to the posteriorly narrowed bodies. Therefore, the incoming flow U 1 in this paper was set to be parallel to the stroke plane of finlets to mimic the local flow condition of finlets as in tuna swimming.…”

Section: Numerical Methods and Simulation Set-upmentioning

confidence: 98%

Tuna locomotion: a computational hydrodynamic analysis of finlet function

Wang

Wainwright

Lindengren

et al. 2020

J. R. Soc. Interface.

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Finlets are a series of small non-retractable fins common to scombrid fishes (mackerels, bonitos and tunas), which are known for their high swimming speed. It is hypothesized that these small fins could potentially affect propulsive performance. Here, we combine experimental and computational approaches to investigate the hydrodynamics of finlets in yellowfin tuna ( Thunnus albacares ) during steady swimming. High-speed videos were obtained to provide kinematic data on the in vivo motion of finlets. High-fidelity simulations were then carried out to examine the hydrodynamic performance and vortex dynamics of a biologically realistic multiple-finlet model with reconstructed kinematics. It was found that finlets undergo both heaving and pitching motion and are delayed in phase from anterior to posterior along the body. Simulation results show that finlets were drag producing and did not produce thrust. The interactions among finlets helped reduce total finlet drag by 21.5%. Pitching motions of finlets helped reduce the power consumed by finlets during swimming by 20.8% compared with non-pitching finlets. Moreover, the pitching finlets created constructive forces to facilitate posterior body flapping. Wake dynamics analysis revealed a unique vortex tube matrix structure and cross-flow streams redirected by the pitching finlets, which supports their hydrodynamic function in scombrid fishes. Limitations on modelling and the generality of results are also discussed.

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Section: Numerical Methods and Simulation Set-upmentioning

confidence: 98%

Tuna locomotion: a computational hydrodynamic analysis of finlet function

Wang

Wainwright

Lindengren

et al. 2020

J. R. Soc. Interface.

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show abstract

“…In zebrafish, phagocytic perivascular cell populations resembling LECs have been found recently in the brain that do not form vessels but are required for the formation of the cerebral blood vessels (Bower et al 2017a;van Lessen et al 2017;Venero Galanternik et al 2017). An interesting case of lymphatic vessel specialization in fish is their involvement in fin erection and thus locomotion in tunas (Pavlov et al 2017). In mouse embryos, the first committed LEC progenitors appear in the cardinal vein at embryonic day 9.5 (E9.5).…”

Section: Lymphangiogenesis In Developmentmentioning

confidence: 99%

Lymphangiogenesis guidance by paracrine and pericellular factors

et al. 2017

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Lymphatic vessels are important for tissue fluid homeostasis, lipid absorption, and immune cell trafficking and are involved in the pathogenesis of several human diseases. The mechanisms by which the lymphatic vasculature network is formed, remodeled, and adapted to physiological and pathological challenges are controlled by an intricate balance of growth factor and biomechanical cues. These transduce signals for the readjustment of gene expression and lymphatic endothelial migration, proliferation, and differentiation. In this review, we describe several of these cues and how they are integrated for the generation of functional lymphatic vessel networks.

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“…Scombrid fishes (e.g. tuna) can erect the median dorsal fins with a musculo-vascular complex (Pavlov et al, 2017). The combination of fin muscles, bones and extensive lymphatic vessels work to hydraulically control the shape and area of the fin affecting stability and maneuverability.…”

Section: Structure Of Primary Control Surfacesmentioning

confidence: 99%

Control surfaces of aquatic vertebrates: active and passive design and function

Fish

Lauder

2017

Journal of Experimental Biology

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Aquatic vertebrates display a variety of control surfaces that are used for propulsion, stabilization, trim and maneuvering. Control surfaces include paired and median fins in fishes, and flippers and flukes in secondarily aquatic tetrapods. These structures initially evolved from embryonic fin folds in fishes and have been modified into complex control surfaces in derived aquatic tetrapods. Control surfaces function both actively and passively to produce torque about the center of mass by the generation of either lift or drag, or both, and thus produce vector forces to effect rectilinear locomotion, trim control and maneuvers. In addition to fins and flippers, there are other structures that act as control surfaces and enhance functionality. The entire body can act as a control surface and generate lift for stability in destabilizing flow regimes. Furthermore, control surfaces can undergo active shape change to enhance their performance, and a number of features act as secondary control structures: leading edge tubercles, wing-like canards, multiple fins in series, finlets, keels and trailing edge structures. These modifications to control surface design can alter flow to increase lift, reduce drag and enhance thrust in the case of propulsive fin-based systems in fishes and marine mammals, and are particularly interesting subjects for future research and application to engineered systems. Here, we review how modifications to control surfaces can alter flow and increase hydrodynamic performance.

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

Cited by 58 publications

References 38 publications

Tuna locomotion: a computational hydrodynamic analysis of finlet function

Tuna locomotion: a computational hydrodynamic analysis of finlet function

Lymphangiogenesis guidance by paracrine and pericellular factors

Control surfaces of aquatic vertebrates: active and passive design and function

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