Table 1.

Mean values of shell height, total weight, shell weight and meat weight of the two species of sea snails according to month of sampling (SE) and species (SP).

	Month of Sampling (SE)		Species (SP)		Error
	November	March	N. mutabilis	H. reticulata	MSE	SE	SP	SE × SP
Shell height (mm)	25.5 ± 0.3	29.8 ± 0.5	28.6 ± 0.4	30.2 ± 0.6	1.350	2.19	0.282	n.s.
Total weight (g)	2.43 ± 0.9 B	3.45 ± 0.6 A	2.84 ± 0.6 B	3.86 ± 0.8 A	0.304	0.001	0.001	n.s.
Shell weight (g)	1.38 ± 0.8 B	2.53 ± 0.9 A	1.46 ± 0.9 B	2.89 ± 0.9 A	0.037	0.001	0.001	n.s.
Meat weight (g)	1.05 ± 0.3	0.92 ± 0.4	1.38 ± 0.3 A	0.97 ± 0.2 B	0.042	0.098	0.019	n.s.
Shell yield (%)	56.79 ± 2.4 B	73.33 ± 1.5 A	51.41 ± 1.4 B	74.87 ± 1.7 A	0.02	0.001	0.001	n.s.
Meat yield (%)	43.21 ± 1.1 A	26.67 ± 1.3 B	48.59 ± 1.6 A	25.13 ± 1.5 B	0.04	0.001	0.004	n.s.

MSE = Mean standard error; A, B = p < 0.01; n.s. = not significant.