The actual study is here: https://www.sciencedirect.com/science/article/pii/S0272771419307644 https://www.sciencedirect.com/science/article/pii/S027277141...

The actual study is here: https://www.sciencedirect.com/science/article/pii/S0272771419307644 https://www.sciencedirect.com/science/article/pii/S027277141... Fishery biomass trends of exploited fish populations in marine ecoregions, climatic zones and ocean basins It's a journal called Estuarine, Coastal and Shelf Science.