• Gill rays

Gill rays are bony outgrowths that support the gill membrane. A number of long bony sticks - gill membrane rays peculiar only to ray-finned fish - are attached to the posterior edge of the lower part of the hyoid arch. The rays of the gill membrane are formations that serve to keep the gill membrane straight. O. tschawytscha is characterized by a large number of rays in the gill membrane.

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