“…The worms also fight for their burrows (Bridges, Farrar, Gamble, & Dillon, ), the possibility of cannibalism (Batista, e Costa, Matias, et al, ), reproduction rate, immigration and fatality (Bridges et al, ; Miller & Jumars, ; Wilson, ; Zajac, ). The worms’ competition for space and food has also been demonstrated (Omena & Amaral, ; Reise, Simon, & Herre, ; Scaps, Brenot, Retiere, & Desrosiers, ). The appropriate density of N. diversicolor in an integrated aquaculture system not only reduces the amount of the effluent organic waste contents (Tsutsumi et al, ) but also can reduce the production cost of these worms (Olive, ; Safarik, Redden, & Schreider, ).…”