Long and short-term trends of Mediterranean fishery resources
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This study makes use of the recently published (FAO 1995) 45 year time series (1950-1994) of landings now available from FAO through the program FISHSTAT-PC (Version 5094/96 of March 1996) to analyse long-term trends and separate them automatically in a number of categories using an expert system for data analysis. Landing time series of the most important commercial species and group of species of both West (148 species) and East (137 species) Mediterranean have been processed with this program written in Pascal, in order to analyse and categorize long and short-term trends in these fisheries. Species trends have been categorized following a description of the different stages a fishery could pass through in time (new, rising, stable, declining, recovering and collapsed fisheries). Species have been also arranged into ecological or biological categories (estuarine, benthic and coastal, pelagic, large pelagic, demersal and slope resources), and differences between West and East Mediter ranean trends were sought for the same and different species. A ranking of the most important commercial species using 1992 catches, as well as by 1992 total value of landings, have been carried out, and a comparison between West and East Mediterranean fisheries has been provided.