John Hargreaves has 44 years of experience in research, teaching, training, and development. For the last 18 years, he has been a freelance consultant on commercial aquaculture and development projects. He has worked with producers employing intensive ponds, biofloc systems, partitioned and recirculating ponds, net pens, raceways, recirculating aquaculture systems, and hatchery and nursery systems. He has broad international experience in Latin America, Asia, Africa, and the Middle East, working with many commercially important finfish, crustaceans and molluscs in freshwater, brackishwater, and marine systems. He was Vice-President of WAS in 1999, named a Fellow of WAS in 2017, and editor of World Aquaculture magazine for 11 years (2012-2023).