According to a published report by FIS Worldwide, "there are 23 stocks of the major commercial tuna species worldwide – 6 albacore, 4 bigeye, 4 bluefin, 5 skipjack and 4 yellowfin stocks...In 2012, the catch of major commercial tunas was 4.6 million tonnes. Fifty-six percent of it was skipjack tuna, followed by yellowfin (28 per cent), bigeye (10 per cent) and albacore (6 per cent). Bluefin tuna accounts for only 1 per cent of the global catch. Globally, 52 per cent of the stocks are at a healthy level of abundance, 39 per cent are overfished and 9 per cent are at an intermediate level. In terms of exploitation, 43.5 per cent of the stocks are experiencing a low fishing mortality rate, 17.4 per cent are experiencing overfishing, and 39.1 per cent have a high fishing mortality that is being managed adequately. When viewed from the point of view of total catch, 86 per cent of the catch comes from healthy stocks."
To report the report: