The IOTC data were obtained from the IOTC web-site (2009). Some RFMO catch and effort datasets are under-estimated when compared to reported nominal catch over similar time and space. In such cases, the catch and effort was raised. The methods for raising the data are outlined in ICCAT-EWG (2007). This process had already been undertaken by the SPC and ICCAT, and was done manually for the Indian Ocean fleets (with exception of Japan, which was believed to have already provided the best estimate of effort to the IOTC). Data provided here have been raised and are not the original data from IOTC. Methods for raising are described in ICCAT-EWG (2007). See also Anon (2007) and Tuck (2004) To request data see www.iotc.org. The IOTC data manager should be consulted with regard to interpretation of the data and associated caveats. Anon, 2007. Analysis of albatross and petrel distribution and overlap with longline fishing effort within the IOTC area: results from the Global Procellariiform Tracking Database. Prepared for the Third Session of the IOTC Working Party on Ecosystems and Bycatch Victoria, Seychelles, 11-13 July 2007 ICCAT-EWG, 2007. Report of the 2007 meeting of the sub-committee on ecosystems. Madrid, Spain, February 19-23, 2007. Tuck, G.N., Polacheck, T., Croxall, J.P., Weimerskirch, H., Ryan, P., Nel, D., Wayte, S., and Bulman, C.M. 2004. A comprehensive study of the ecological impacts of the worldwide pelagic longline industry: Southern Hemisphere studies. Hobart CSIRO Marine Research. Chapter 4. Modelling the impact of fishery incidental mortality on three populations of wandering albatross, pages 149-241