Standing committee on tuna and billfish

The tuna and billfish assessment programme (TBAP) has compiled daily catch and effort logsheet data from distant-water fishing nations since the early 1980s|Overall coverage of purse seine catches by data held collected by member countries can be determined from independent estimates of annual catches.|The evidence for under-reporting by Taiwanese vessels raises questions concerning how the catches are under reported.|Estimates of the rate of under repotting, P under, can be obtained from the actual annual catch, C A, the catch recorded on logsheets, C L, and the rate of non- reporting, P non, from the following relationship;