High-resolution logbook data

To increase the level of detail, a supplementary native
logbook dataset of direct observations, collected in 2019 by scientific
personnel on 45 commercial fishing vessels (19 OTB, 8 TBB, and 18 PTM), and
containing landings and fuel consumption information, was combined with the
on-site energy audits. The Electronic logbook is the key element of the
Electronic Recording and reporting System (ERS) defined within the European Fisheries
Control Framework used to record, report, process, store and send fishery data (catches,
landings, sales and transhipment). The analysed logbook 2019 data were thus
effort (in active fishing days), fuel consumption, and annual landings overall
and by species, which allowed the computation of FUI and CF of each fishing
vessel.

In order to obtain fisheries-specific fuel use estimation,
the combined dataset (e.g., energy audits and high-resolution logbook dataset)
was used to model the relationship between daily fuel consumption and vessel
length overall (LOA). This theoretical LOA-based fuel use model, responding to
the combined analysed dataset, was then scaled up to infer the daily fuel
consumption of the entire national fleet/segments.