Consistency in the correlation of school parameters across years and stocks
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AuthorsMuiño, R. (Ramón); Carrera, P. (Pablo); Petitgas, P. (Pierre); Beare, D.J. (Douglas); Georgakarakos, S. (Stratis); Haralabous, J. (John); Iglesias, M. (Magdalena); Liorzou, B. (Bernard); Massé, J. (Jacques); Reid, D.G. (David G.)
Acoustic surveys have been undertaken in different parts of the waters around Europe. In this paper we consider those taking place in NE Atlantic waters – off the NE Scottish coast, the Bay of Biscay and off the Spanish Atlantic coast – and in the Mediterranean Sea – the Catalonian Sea, the Gulf of Lion and the Aegean Sea. Retained school variables were: corrected school length (m), school height (m), school area (m2), school perimeter (m), school energy (Nautical area scattering coefficent, SA), school density (energy vs. area), school depth (m) and bottom-depth-under-school (m). STATIS (Structuration de Tableux à Trois Indices de la Statisque), a multi-table analysis based on the Principal Component Analysis was used to analyse the correlation in different schools, parameters and intra- and interstock relationships. In all stocks, the first three axes extracted explained between 86.89% (Sete) and 91.84% (Aberdeen) of the total variance, because the annual variability present in the ...