An Assessment of the Biological Significance of a Visual Clutch Staging Scheme for Ovigerous Female American Lobster (<i>Homarus americanus</i>).

The differences in the duration of clutch stages 2–4 were highly significant (F 2,18 = 861.20, p < 0.0001 and F 2,18 = 408.22, p < 0.0001, the most conservative and liberal estimates, respectively), as were those concerning their rate of embryonic development (F = 22.99, p < 0.0001), and neither of these varied significantly among females (stage duration more conservative: F 9,18 = 0.46, p = 0.88; stage duration most liberal: F 9,18 = 1.66, p = 0.17; embryonic development rate: F 9,18 = 0.92, p = 0.53) ( Figure 2 ).

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