Abstract

Illustrated description of the scales of the cryopelagic polar cod (Boreogadus saida) is given for the first time. Scale cover in this species is formed by the ordinary cycloid scales as well as a rather numerous additional spiny bony plates, which superficially resemble placoid scales. We hypothesize that these spiny bony plates probably perform a several functions, namely, reduce the turbulence of the water flows in the boundary layer of the body, protect the skin from damage by the sharp edges of ice sludge and ice floe, serve for increasing the buoyancy of the body, especially in the coastal low-salinity waters of the Arctic. Scale cover in gadid co-habitant Arctic cod Arctogadus glacialis is formed by the smooth cycloid scales only without spiny bony plates.

中文翻译：

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极地鳕鱼Beogadus saida（Gadidae）对冰环境中生物的形态适应

摘要

在cryopelagic极地鳕鱼（的尺度图解说明北鳕）给出了第一次。该物种的鳞片覆盖物是由普通的摆线鳞片以及相当多的额外棘刺性骨板形成的，这些表面在表面上类似于类浮石鳞片。我们假设这些刺骨板可能具有多种功能，即减少身体边界层中水流的紊流，保护皮肤免受冰泥和浮冰锋利边缘的损害，从而有助于增加身体的浮力，特别是在北极沿海低盐度水域 gadid同居北极鳕鱼Arctogadus glacialis中的鳞片覆盖物仅由光滑的摆线鳞片形成，而没有刺骨板。