Analyzing the factors that enable fish to reproduce in the Gulf of Cadiz

The Guadalquivir estuary showed the highest density of early stages fish and also of macro-zooplankton (fish prey). A higher concentration of organic matter (preferential food of the macrozooplanton in the Guadalquivir), provided by a greater flow of fresh water and correlated with total suspended solids, inorganic matter and turbidity, were the most typical characteristics of the Guadalquivir.