World Aquacluture Magazine - September 2020

WWW.WA S.ORG • WORLD AQUACULTURE • SEP TEMBER 2020 61 was 49 percent at 30 DPM and thus not suitable for aquaculture. Larval growth rate was similar to results reported in the literature (Xing et al. 2007). Post-larvae in NIT and NIT + A treatments had a greater test diameter in comparison to that of natural biofilm (Table 2). There was no significant difference in test diameter of post-larvae on NIT and NIT + A biofilms. For a biofilm to be effective and useful, it must induce a high settlement rate and result in a low mortality rate while increasing post-larval growth (Grosjean et al. 1998, Azad et al . 2010, Mos et al . 2011). This study indicates that Nitzschia laevis biofilms are an appropriate cue for settlement and growth of purple sea urchin larvae in aquaculture. 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