Fig. (5) Increment in the mass per day for the specimen with the mechanical stimuli (Δm_r/day). Δm_r/day was calculated in each group for the following three divisions of the period: Pre, before giving the mechanical stimuli to the specimen; MS, at giving the mechanical stimuli; Post, after giving the mechanical stimuli. The results of the statistical tests were described in Tables 1 and 2. Siphon, n = 6; M1, n = 6; M2 & Bottom, n = 8.