Changes in fishing production in the northern Brazil

This study analyzed temporal changes in fishery production along the northern coast of Brazil to assess evidence of fishing down marine food webs. Landings data from Pará State between 1997 and 2007 were used to evaluate variations in catch composition and mean trophic levels (MTL). Mean annual landings (t) by combined taxa peaked around 1998 and 2002, followed by a steady decline in later years. High-trophic groups, including large pelagic, demersal fish, and elasmobranchs, showed marked reductions in mean annual landings. Although no significant annual differences in MTL were detected, linear regression revealed a significant negative temporal trend, indicating a gradual shift toward species of lower trophic levels. These results suggest that fisheries in northern Brazil are undergoing a process of fishing down where high-value, top-predator species such as Cynoscion acoupa and Scomberomorus brasiliensis are being replaced by smaller, faster-growing taxa. This scenario is reinforced by decreases in catch volumes of the main target fishery resources. Despite limitations in data reliability, the consistent decline in trophic level underscores the need for improved monitoring systems, accurate species identification, and the implementation of ecosystem-based management strategies.