Commercial longline industry targeting tunas, swordfish, sharks and other large pelagic groups.
Base data source
Data collated by Dr Carola Kirchner as part of the current project from information
collected and held by NatMIRC. Approximately half of the data had to be removed
due to inconsistencies and missing information. We are therefore not confident
about the underlying data.
Methods
Commercial data from 2003-2012 are available. Effort is given as the number of
hooks set, and catch in terms of mass (kg). Spatial summaries of total effort per 5’
grid for the study period were calculated. Resultant values were normalized using
the d/d80 method (catch d80 = 3715; effort d80 = 3580). Although both catch and
effort were calculated, only effort is shown as this is the layer that we intend using
in the analysis as it is most consistent with the approach used for other industries.