THEORETICAL ASPECTS FOR THE ANALYSIS OF CATCH AND EFFORT DATA THROUGH TRANSFER FUNCTION NOISE MODELS

Abstract

The evaluation of a fishing resource is often done through the relationships between the annual catch or catch per unit of effort and the annual fishing efforts. These relationships are used in order to establish adequate levels for the purpose of assuring the conservation and the exploitation of the resource. Because the catch, the catch per unit of effort and the fishing effort are time series, in this paper theoretical aspects are introduced in order to analyze the relationships between these variables through transfer function noise models, considering the autocorrelation structure of the series. The equivalence between the time series approach and the classical models historically used in the analysis of fisheries is demonstra ted, and the correlated structure of the error is incorporated into these models in a systematic way. Finally, it is discussed the potential application of the transfer function noise models in the fisheries research.