Figure 2

Food consumption of Apostichopus japonicus fed fresh food and food aged for 24 h for the three groups (mean ± SD, N = 8). KF, FF, S refer to group KF (consume the feces of sea urchins fed kelp), group FF (consume the feces of sea urchins fed prepared feed) and group S (consume the sea cucumber feed). The asterisk ***means P < 0.001.