The use of fish aggregating devices (FADs) – man-made structures placed at sea as anchored or floating devices designed to attract schools of fish – has been a hotly debated topic because of their tendency to catch higher rates of juvenile yellowfin and bigeye tunas as bycatch of tuna purse seine fishing. For unknown reasons, juvenile tunas form schools and swim beside similar-sized adult skipjack tunas – the target of purse seine fishers. Depending on geography and season, the proportion of juvenile yellowfin and bigeye tunas vary between five to 30 percent of total catch.

Ingles, J. (2012, September 9 ). Defining juvenile tuna-why size really matters. The Philippine Star, p. B-4.