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Forecasting of jack mackerel landings ( T rachurus murphyi ) in central‐southern C hile through neural networks
Author(s) -
Naranjo Laura,
Plaza Francisco,
Yáñez Eleuterio,
Barbieri María Ángela,
Sánchez Felipe
Publication year - 2015
Publication title -
fisheries oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 80
eISSN - 1365-2419
pISSN - 1054-6006
DOI - 10.1111/fog.12105
Subject(s) - lag , mackerel , environmental science , statistics , fishing , oceanography , variance (accounting) , fishery , fish <actinopterygii> , mathematics , computer science , biology , geology , computer network , accounting , business
In the present study, the performance of neuronal networks models in monthly landing forecasting of jack mackerel ( T rachurus murphyi ) in central‐southern C hile (32°S–42°S) was assessed. Thus, monthly estimations for 10 environmental variables, fishing effort (fe) and jack mackerel landings for the period 1973–2008 were used. A preliminary analysis was done in order to remove strongly correlated variables. Sea surface temperature ( SST ) and fe are established as input variables, then, a non‐linear cross correlation analysis was performed to estimate the lag between the input variables and jack mackerel landings. Two models were adjusted: model one includes both training and testing cases randomly selected using all data involved in the analysed period; for model 2, the data is divided into two time series: the first from 1973 to 2002 used for training and the second between 2003 and 2008 used for validation. The external validation process for model 1 showed an explained variance of 92%, with a standard forecasting error of 30%. The explained variance for model 2 was 81%, with a standard forecasting error of 38%. Finally, the sensitivity analysis for both models showed the fe as the most influential variable to jack mackerel landings, which presents functionality depending on anthropogenic effects rather than environmental conditions.