species and ecosystems. Our paper reviews the geographic and/or biogeographic regions where the majority of studies concerning the feeding ecology of fish have been conducted, with the goal of identifying regions and/or environments in need of further attention. In addition, we identify which journals published more papers regarding the subject. Our analysis was conducted by assessing studies indexed on the ISI Web of Science database. We detected a lack of data concerning several aspects of the feeding of fish, such as: threatened species; freshwater habitats especially within the Neotropical, Ethiopianand Orientalrealms;species rich developing countries; and, when considering marine fish, the Eastern Indo-Pacific region. Considering the calculated weight for each journal, Ecology of Freshwater Fish, Neotropical Ichthyology and Environmental Biology of Fishes were the most important ones. If we ignore these gaps in our knowledge we run the risk of losing a huge amount of information without knowing it ever existed, especially in the fast changing world we face today.