TUNA | Cancun tuna Fishing - Tuna Fishing Season in Isla Mujeres Mexico. Kianah's Spor fishing Cancun

Blackfin tuna (Thunnus atlanticus) is the smallest tuna species in the Thunnus genus, generally growing to a maximum of 100 centimetres (39 in) in length and weighing 21 kg (46 lbs). Blackfin have oval shaped bodies, black backs with a slight yellow on the finlets, and have yellow on the sides of their body. Blackfin are only found in the western Atlantic from Cape Cod, Cancun Mexico to Brazil.