The seahorse carries a genuine biological wonder that shaped its later symbolism: it is the male that becomes pregnant, receiving the eggs into a brood pouch and carrying and bearing the young, one of the very few animals in which the father gives birth. This reversal made the seahorse an emblem of fatherhood, patience and protective care. It has long been used in the traditional pharmacopoeia of China, a practice noted here without endorsement and one that, with the loss of its habitats, now raises real conservation concern. Ridden by sea-gods and bearing its own young, the seahorse gathers meanings of the sea's power, of patience and of a father's care.
The seahorse lent its scientific name, Hippocampus, to an unrelated part of human anatomy: the curled, ridged structure inside the brain that is central to memory formation was named the hippocampus by early modern anatomists because its shape reminded them of the little sea-creature, so the seahorse survives today as much in neuroscience textbooks as in mythology, an accidental second life for the same Greek compound of horse and sea-monster. The seahorse's popularity in the traditional Chinese pharmacopoeia, noted above, has had a measurable modern consequence: international trade in all seahorse species was placed under CITES Appendix Two controls in 2004, requiring permits for cross-border trade specifically because unregulated demand for dried seahorses was assessed as a genuine threat to wild populations.