Hydraulic fins The lymphatic system in fish has much the same function as it does in mammals—immune response and homeostasis. Pavlov et al. show, however, that in the scromboid (tuna and mackerel) family of fish, this fluid homeostasis function has been co-opted to help facilitate dorsal fin rigidity and movement (see the Perspective by Triantafyllou). In bluefin tuna, a series of lymphatic vessels are integrated with muscles that allow the fish to raise and stiffen their dorsal fin. This provides extra stability during swimming. Science, this issue p. 310; see also p. 251 The lymphatic system facilitates fin stiffness in tuna. 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.

中文翻译：

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金枪鱼鳍的液压控制：淋巴系统在脊椎动物运动中的作用

液压鳍 鱼的淋巴系统与哺乳动物的淋巴系统功能大致相同——免疫反应和体内平衡。巴甫洛夫等人。然而，表明在鲭鱼（金枪鱼和鲭鱼）家族中，这种流体稳态功能已被用来帮助促进背鳍的刚性和运动（参见 Triantafyllou 的观点）。在蓝鳍金枪鱼中，一系列淋巴管与肌肉结合在一起，使鱼能够抬起并加强背鳍。这在游泳过程中提供了额外的稳定性。科学，这个问题 p。310; 另见第。251 淋巴系统促进金枪鱼的鳍僵硬。硬骨鱼的淋巴系统具有与哺乳动物淋巴系统相似的遗传和发育起源，后者参与免疫反应和体液稳态。这里，我们表明金枪鱼的淋巴系统在游泳流体动力学中起作用。具体来说，由鳍肌肉、骨骼和淋巴管组成的肌肉血管复合体参与了正中鳍的液压控制。淋巴系统的这种专业化与鲭科鱼类有关，并且可能是为了响应这些高性能物种对游泳和操纵控制的需求而进化的。