Jiang Taigong’s grilled fish signature is available. If you want to use the trademark "Jiang Taigong Grilled Fish" as your own sign or trademark, you need to register the trademark first to ensure that your use will not infringe on the trademark rights of others. Trademark registration can be applied for at the State Intellectual Property Office or its authorized agency. Before registering a trademark, you need to conduct a trademark search to determine whether the trademark has been registered or used by others. If the trademark has been registered by others or a similar trademark exists, you cannot use the trademark. In addition, even if you successfully register a trademark, you still need to pay attention to comply with relevant laws, regulations and trademark usage regulations to avoid infringing on the trademark rights of others, and at the same time, you must protect your own trademark rights. If you find that others have infringed upon your trademark rights, you can protect your rights through legal means. To sum up, if you want to use the trademark "Jiang Taigong Grilled Fish" as your own sign or trademark, you need to register the trademark first and comply with relevant laws, regulations and trademark usage regulations.