Factors affecting thunniform swimming biomechanics.

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Presentation transcript:

Factors affecting thunniform swimming biomechanics. Factors affecting thunniform swimming biomechanics. (A) Contrasts of the more fusiform body shape of the striped bonito, Sarda orientalis (top), with the black skipjack's (Euthynnus lineatus) increased anterior vertical thickness (from Graham, 1975). (B) Three-dimensional perspective for Sarda (S) and Euthynnus (E) of similar size showing structural features of a single myotome. The hatched area is the only aspect of the myotome that would be visible in a skinned fish. Myotomes have anterior pointing arms (APA) and cones (APC) and posterior pointing cones (PPC) and connect to the vertebral column via the anterior (AOT) and posterior oblique tendons (POT) within the horizontal septum. Lines on the surface of APCs show how AOTs wrap around the APCs for force transfer. The tuna has thicker, longer APCs and an anterior-medial red muscle (RM) mass (stippling). In the bonito, with laterally placed RM, the AOT is longer than in the tuna. As the bonito POT extends posteriorly to insert on vertebrae, it makes a greater angle of incidence with the vertebrae than in tuna. Also illustrated for Euthynnus are its left-side lateral artery (la) and vein (lv) and its central rete (cr). Reproduced from Graham and Dickson (2000). Jeffrey B. Graham, and Kathryn A. Dickson J Exp Biol 2004;207:4015-4024 © The Company of Biologists Limited 2004