How to Go Bottom Fishing In Cozumel? At TopCozumelNews, we help people traveling to Cozumel plan their trips and activities using information collected on our trips to the beautiful island. Cozumel offers some of the world’s finest deep-sea fishing spots. This idyllic Mexican island features beautiful reefs and abundant marine life – making this destination ideal for deep-sea anglers. Cozumel waters are home to an array of fish species, from tuna and billfish to wahoo and blue marlin (white marlin or sailfish), white marlin (blue marlin), sailfish, and blue marlin. March through July is typically ideal for hooking these giant fish species.