Bryce is a marine ecologist and fisheries biologist whose work has ranged from temperate estuaries to tropical coral reefs and the deep-sea. The central thread in his research has been to gain an increased understanding of the factors regulating marine populations and communities so as to ensure their sustainable utilization. His work on deep-sea fishes was among the first to demonstrate their extreme longevity, and on coral reefs he provided new evidence for mechanisms of community regulation of prey fish by predators. More recently his focus has been on how to improve the management of fisheries through the use of predictive recruitment models, marine protected areas and stock enhancement. Bryce has also been especially active in promoting the sale and consumption of sustainable seafood by working with everyone from government ministers to fishermen, restaurants and supermarket chains.