Proximate composition of rearing substrates at the start (initial, t = 0 days) and the end of the trial (final, t = 7 days).

All values are shown as mean ± standard error (SE; n = 3) for the percentage of wet weight (%WW) or dry matter (%DM). Dissimilar lower case superscript letters represent significant differences between means within the same column (p < 0.05) whereas asterisks indicate a significant difference between initial and final substrate composition for the indicated parameter.