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首页> 外文期刊>Journal of experimental marine biology and ecology >The slowest fish: Swim speed and tail-beat frequency of Greenland sharks
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The slowest fish: Swim speed and tail-beat frequency of Greenland sharks

机译：The slowest fish: Swim speed and tail-beat frequency of Greenland sharks

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Locomotory muscle function of ectothermic fishes is generally depressed in cold waters, making them vul-nerable to avian and mammalian predators whose body temperature remains high. Paradoxically, Greenland sharks Somniosus microcephalus exhibit the reverse of this usual predator-prey thermal pattern by apparently hunting seals in Arctic waters. To examine whether this species possesses cold-adaptations that enhance its swimming performance, we used data-logging tags to measure swim speed and tail-beat frequency (which reflects muscle-shortening speed) of six free-swimming sharks (204-343 kg). For comparison, we compiled these parameters for wild fishes from the literature over a wide body mass range (0.2-3900 kg) and examined the scaling relationships using phylogenetically informed statistics. The sharks cruised at 0.34 m·s~(-1) with a tail-beat frequency of 0.15 Hz, both of which were the lowest values for their size across fish species. The mean and maximum speed (0.74 m·s~(-1)) and acceleration during burst swimming (0.008 m·s~(-2)) were much lower than those of seals. Our results indicate that the swimming performance of Greenland sharks is limited by cold waters (～2℃) and insufficient to catch swimming seals. However, Arctic seals sleep in water to avoid predation by polar bears Ursus maritimus, which may leave them vulnerable to this cryptic slow-swimming predator.

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