On the Growth at Moulting of Lobsters (Homarus Vulgaris) in Cornwall and Yorkshire

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Abstract
In experiments in Cornwall and Yorkshire 214 marked lobsters (H. vulgaris M. Edw.) were erturned after moulting. Of these a number had moulted more than once, and the separation into once-, twice- and three-times-moulted lobsters was achieved using probability paper. There was no significant difference in growth of lobsters from the 2 areas. It is concluded that the best method of plotting growth in lobsters is to plot carapace length before moulting against carapace length after moulting. It is concluded that malc lobsters show arithmetic growth over the size range 68-123 mm carapace length, adding a constant mean increment of 9.8 mm carapace length at each moult. It is concluded that arithmetic growth, with a mean increment of 8.4 mm, adequately describes the growth of femalc lobsters over a small size range centred on a mean size of about 85 mm, but would lead to inaccuracies over a wider size range. The concept of arithmetic growth in relation to the general growth pattern is briefly discussed.

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