Skip to Main content Skip to Navigation
New interface
Journal articles

Fishing activity of tuna purse seiners estimated from VMS dada and validated by observers' data

Abstract : In the lack of direct estimate of tuna abundance, the French tropical tuna fleet of purse-seiners provides a way to monitor the tuna stocks particularly through the calculation of Catch per Unit of Effort (CPUE). The objective of this study was to analyze the individual track of purse seiners with the aim to identify which part of the searching behaviour should be used to perform the fishing effort. In this context, Vessel Monitoring Systems (VMS) data are useful to analyse the different fishing activities of a purse seiner at a small scale (i.e.. stop, track and cruise), generally embedded into the concept of fishing effort. A state-space model (run in a Bayesian framework) was applied to speeds and turning angles from Vessel Monitoring Systems (VMS) data, to identify the different “states” of the fishing behaviour of a purse seiner over a fishing trip. Then a threshold was fitted to distinguish the activities “fishing” and “stop” without fishing (from the “still” state), “tracking” (from “meander”), and “cruising” (from “straight”). On a subset of VMS data corresponding to observers' data, some differences of fishing efforts between fishing on free-swimming schools and schools associated with FAD (Fish Aggregating Devices) are highlighted.
Document type :
Journal articles
Complete list of metadata

Cited literature [22 references]  Display  Hide  Download
Contributor : Daniel Gaertner Connect in order to contact the contributor
Submitted on : Tuesday, December 7, 2010 - 11:02:05 AM
Last modification on : Friday, October 14, 2022 - 3:37:09 AM
Long-term archiving on: : Friday, December 2, 2016 - 3:05:53 PM


Publisher files allowed on an open archive




Emily Walker, Daniel Gaertner, Philippe Gaspar, Nicolas Bez. Fishing activity of tuna purse seiners estimated from VMS dada and validated by observers' data. Collective Volume of Scientific Papers, 2010, 65 (6), pp.2376-2391. ⟨ird-00543323⟩



Record views


Files downloads