Using min/max autocorrelation factors of survey-based indicators to follow the evolution of fish stocks in time

Type Article
Date 2009-06
Language English
Author(s) Woillez MathieuORCID1, Rivoirard Jacques2, Petitgas Pierre1
Affiliation(s) 1 : IFREMER, Dept EMH, F-44311 Nantes 03, France.
2 : Ctr Geosci Geostat, F-77300 Fontainebleau, France.
Source Aquatic Living Resources (0990-7440) (EDP Sciences), 2009-06 , Vol. 22 , N. 2 , P. 193-200
DOI 10.1051/alr/2009020
WOS© Times Cited 12
Keyword(s) Fish stock diagnostics, Survey based indicators, Time correlation, Min/max autocorrelation factors
Abstract Fisheries research monitoring surveys provide an ensemble of measurements on fish stocks and their environment. Because the interannual variability in such survey-based indicators is high and because diagnostics on fish stocks cannot be based on noise, our concern is to make use of what is continuous in time to obtain a reliable diagnostic. In this paper, we show how min/max autocorrelation factors (MAFs) can be useful for assessing the status of a fish stock. Indeed, MAFs will allow us to (i) summarize the multivariate indicator signals into orthogonal factors that are continuous in time, (ii) select those indicators that carry the major signal in time, and (iii) forecast stock status by modelling the time continuity of the MAFs. These different potential uses of MAFs in an indicator-based approach to assessment were illustrated with North Sea cod, for which a suite of biological and spatial indicators are available over a 21-year survey series.
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