Figure 6. Circumferential growth rates of Nautilus pompilius at Osprey Reef.

Nautilus which were immature at both first capture and recapture (diamond symbol, n = 15) were used to calculate growth rate. A linear regression showed a growth rate of 0.068 mm/day while mean growth rate = 0.0614±0.023 mm day⁻¹). Individuals which were immature at first capture but matured during the time before recapture (circle symbol, n = 23) showed varied growth rates, all <0.0614 mm day⁻¹.