This is a Korean sandlace (Hypoptychus dybowskii) male tending to fresh eggs which a female has deposited on sargassum (Sargassum horneri (Turner) C.Agardh). Each egg is a few millimeters in size. Korean sandlances grow up to 10cm in length. They produce a sticky secretion in their kidneys that they use to adhere eggs to sargassum.
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