A trophometric index (TMI) is proposed to estimate fish density, biomass and production in Mediterranean reservoirs. It consists of simple and integrated environmental variables such as the form index (IF = S/V ), the volume percentage of water with sufficient oxygen to sustain fish life, conductivity, chlorophyll a concentration and perimeter, the synergic effect of which explains the fish structure and accounts for the functioning of the ecosystems. This index was tested in eight reservoirs in the Guadalquivir River basin, showing a good fit with a potential model for fish density and a linear model for fish biomass and production (P < 0.01; r 2 > 0.8). The TMI is a valuable tool for evaluating fishery production in Mediterranean reservoirs and allows these to be classified by type for better management and evaluation in the framework of the European Water Directive.biomass, density, fish production, fishery evaluation, reservoir, trophometric index.
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