Seahorses are protected under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), and international trade is regulated and controlled. However, whether you need a license for a pet seahorse depends on the specific regulations and laws in your country or region. Some jurisdictions may require a license or permit to keep or possess certain species of seahorses, while others may allow it without the need for a specific license as long as certain conditions are met.
Therefore, it's important to consult the local wildlife authorities or relevant government departments in your area to obtain accurate and up-to-date information regarding the regulations for keeping pet seahorses. They can provide you with the specific requirements and guidelines for obtaining the necessary permits or licenses, if applicable.