The "Sales" data in the declarative flow contain mainly auction sales data and some non-exhaustive data on non-auction sales.

The "Fishing trips" data in the declarative flow correspond to the catch and fishing effort data declared by the professionals in the logbooks for vessels whose overall length is greater than or equal to 10 metres, and the fishing sheets for vessels whose overall length is less than 10 metres.

Vessel Monitoring System (VMS) data is the data from the Community's satellite-based fishing vessel monitoring system, which provides data on the position, course and speed of vessels to fisheries authorities at regular intervals.

These data provide information on the characteristics of shipowners and vessels: registration, year of construction, material, length, port, place of registration, membership of the FPC file, tonnage, power.

The observation of catches at sea, whether landed or discarded by professional fishing vessels, provides a better understanding of the interactions between fishing activity, resources and marine ecosystems. This system, called ObsMer, is applied in metropolitan France, excluding Corsica.