Table 2. Trends in regional estimates of illegal fishing, averaged over 5 year periods 1980–2003.
| Region | 1980–1984 | 1985–1989 | 1990–1994 | 1995–1999 | 2000–2003 |
| Northwest Atlantic | 26% | 19% | 39% | 15% | 9% |
| Northeast Atlantic | 10% | 10% | 12% | 11% | 9% |
| Western Central Atlantic | 16% | 14% | 14% | 11% | 10% |
| Eastern Central Atlantic | 31% | 38% | 40% | 34% | 37% |
| Southwest Atlantic | 15% | 18% | 24% | 34% | 32% |
| Southeast Atlantic | 21% | 25% | 12% | 10% | 7% |
| Western Indian | 31% | 24% | 27% | 25% | 18% |
| Eastern Indian | 24% | 29% | 30% | 33% | 32% |
| Northwest Pacific | 16% | 15% | 23% | 27% | 33% |
| Northeast Pacific | 39% | 39% | 7% | 3% | 3% |
| Western Central Pacific | 38% | 37% | 37% | 36% | 34% |
| Eastern Central Pacific | 20% | 17% | 13% | 14% | 15% |
| Southwest Pacific | 10% | 9% | 7% | 7% | 4% |
| Southeast Pacific | 22% | 21% | 24% | 23% | 19% |
| Antarctic | 0% | 0% | 2% | 15% | 7% |
| Average | 21% | 21% | 21% | 20% | 18% |
The figure given is the mid-point between the lower and upper estimates of illegal and unreported catch in the case study species, expressed as a percentage of reported catch of case study species.