This is a male Korean seahorse (Hippocampus haema) hatching a juveniles after brooding them for somewhere between three and ten weeks. The adult is about 8cm in length. As they develop, the juveniles are curled up inside the brood pouch. Though some emerge straightened out, many are ejected in curled-up form, eventually unfurling, some soon after emerging, some sinking as they take time to adjust. In this photo, a number of curled-up juveniles are just about to be ejected from the brood pouch. Described in 2017, this species is found in the waters of Korea, as well as along the southern and western coasts of Japan.
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