A landing forecast for horse mackerel, Trachurus symmetricus murphyi (Nichols, 1920) off Central Chile
H. Arancibia, R. Alarcón, L. Cubillos and D. Arcos

In the period from 1990 to 1992, the landings of horse mackerel (Trachurus symmetricus murphyii) off Central Chile showed a conspicuous seasonality, with a maximum between April and July, and a minimum between September and January. The monthly landings (Y, tons) were fitted to a trigonometrical function, with amplitude (A) being variable and period (T) constant along a long-term trend (a), whose form is: YF = a - ATcos(n P t + F). The predicted 1993 monthly landings were calculated, with an accumulated value of 2.5 million tons. The difference between the observed and predicted monthly landings was 0.8%.

Keywords: forecast, Trachurus symmetricus murphyii, astern South Pacific.
Contents of this volume Sci. Mar. 59(2) : 113-117 Back PDF
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