January 30, 2020 — Understanding how many fish are in the sea is crucial to creating effective policy and management strategies. One study out of the University of Washington in Seattle took a close look at how fishing pressures and stock abundance are correlated. How will management initiatives in countries with high fishing pressure affect the number of fish that are available to catch? Ray Hilborn and 23 contributing authors on the paper took a data-driven approach to this question with optimistic results that they hope will convince policymakers and the public that fish stocks are actually on the rise.
Hilborn has been labeled an “overfishing denier” for his divisive views on the status of overfishing and his pushback against marine protected areas (MPAs), but Hilborn argues that closing areas to fishing is not necessarily the answer; “fisheries are not well managed in many parts of the world (the ones primarily where we did not have data for our paper)…our paper shows that fisheries management does work when implemented”. The researchers assessed fish catch data from six continents (which comprised about 50% of total global catch) up until the year 2016 and found that where fish stocks were being managed properly, increased number of fish was the result. “Our hope for the use of the results is that the thousands of scientists, managers and technicians that have helped stop overfishing will be recognized for their contribution”, Hilborn says.
Fish stock assessments use data gathered from a number of sources including fisheries landings (the fish that are caught by fishers and reported), biological studies and scientific surveys. While there are uncertainties in the data due to environmental, financial and technological limitations, stock assessments provide the backbone of fisheries management and drive regulatory decisions.