A three day old lined seahorse - approximately 1 cm long
The ventral surface of the adult male seahorse (his belly) is equipped with a pouch used for carrying eggs that the female had deposited while mating. There, the eggs are fertilized, then hatched, and the young are carried until fully developed. It becomes obvious in seahorses, as in many animals, when they are close to giving birth. This particular male was very gravid, and we knew it was only a matter of days before he gave birth!
One of the juveniles feeds on Artemia nauplii (the small white dots)
Juvenile seahorses are obviously incredibly small and in captivity, the life support system must be designed so they do not get sucked into the filtration system. They also require a very specific water flow; too much and they get buffeted about, too little and they do not feed or swim effectively. The little horses will eat enriched live zoo-plankton, primarily Artemia (brine shrimp) nauplii, until they can be transitioned to more substantial and nutritious foods.
Below is a video of the day old sea horses and some very small nauplii they are feeding on.
