Seahorse farm. Seahorse breeder holding a jar containing a seahorse (Hippocampus kuda) at Seahorse Ireland, the world's first seahorse farm. Seahorses are bred in large tanks with constantly circulating water and fed on a diet of plankton and algae. Seahorse Ireland supplies animals to the aquarium trade and is developing technology that enables farmers in far and South-East Asia to conserve local stocks. Female seahorses produce up to 2,000 eggs, which are transferred to the male's brood pouch for fertilisation and incubation. Many species are endangered through overfishing for the aquarium and traditional Chinese medicine trades.