A new approach to recruitment overfishing diagnosis based on fish condition from survey data
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AuthorsOrdines, F. (Francesc); Lloret, J. (Josep); Tugores, M.P. (María Pilar); Manfredi, C. (Chiara); Guijarro, B. (Beatriz); Jadaud, A. (Angélique); Porcu, C.; Gil-de-Sola-Simarro, L. (Luis); Carlucci, R. (Roberto); Sartini, M.; Isajlovic, I.; Massutí, E. (Enric)
A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was explained by the negative correlation with recruit abundance, and with two climatic indices, the Western Mediterranean Oscillation and the standardized air temperature anomaly at surface from the Gulf of Lions. Despite the differences ...
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