Some correlations between CPUE series of hake (Northern Stock)
Authors
Pereiro-Muñoz, J.A. (José Antonio); Fernández, Á. (Álvaro); Pereiro-Muñoz, F.J. (Francisco Javier)Date
1984Type
working paperAbstract
This document describes results of computing correlations between
different CPUE series of hake (Northern Stock). Results show that
significant correlations between some series appeared when same
lag was allowed between series. Lesconil artisans CPUE (fishing in
division VIlla) in year t seems to be correlated to CPUE La Rochelle
"artlsans" on the same year, to La Coruña trawlers fishing
in subarea VII on year (t+1) and to La Rochelle "hauturiers" fishing
in subarea VII on year (t+3) ; these "hauturiers" CPUE is
correlated with Lorient trawlers CPUE fishing in divisions IVa +
VIa two years later.
These correlations allow to become more confident on these CPUE series. However, it is difficult to believe that plots like the one in
fig. 7 can prove that there is a direct cause to affect relationship between hake CPUE from "artisans" in subareas VII and VIII and hake CPUE
from "hauturiers" fishing in divisions IVa + VIa two years later.
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