Zanzibar is renowned for its top-notch deep sea fishing opportunities in Unguja, Pemba, and Mafia, where you can reel in marlin, sailfish, tuna, barracuda, and trevally. The Indian Ocean is teeming with an abundance of fish, including migrating tuna and pelagics, as well as resident snapper, grouper, and sharks. Tuna is at its peak from August to October, while marlin and sailfish are prevalent from November to March, following the monsoon patterns.