Seahorses are marine fish that are found in temperate and tropical waters all over the world. The seahorse is a true fish, with a dorsal fin located on the lower body and pectoral fins located on the head near their gills.
They are notable for being the only species where the males become pregnant. Most pregnancies for seahorse species' will last approximately two to three weeks. Once released, the offspring are independent of their parents.
Seahorses are generally monogamous ~ the male and female will greet one another with courtship displays in the morning and sometimes in the evening to reinforce their pair bond.
Seahorses should be kept in an aquarium to themselves. Seahorses are slow feeders, and in an aquarium with fast, aggressive feeders, the seahorses will be edged out during feeding.
Information source: Wikipedia