Overfishing Tuna Overfishing Tuna Overfishing Tuna Overfishing Tuna Driven by increasing demand for tuna, fishing pressure has negatively impacted tuna stocks. For instance, in the Coral Triangle region, two of the key tuna species, bigeye and yellowfin, are now on the verge of becoming overfished. Overfishing of these key marine predators can upset the ecological balance of this the global center of marine biodiversity. Source: World Wild Life Tuna Overfishing Tuna Recent history of Atlantic bluefin tuna Rising demand for bluefin tuna in the 1980s led to overfishing and by the 1990s, it is estimated as much as 50,000 to 61,000 tonnes of bluefin tuna per year were caught in the East Atlantic and Mediterranean Sea Source: Marine Stewardship Council