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The increase per cent in the growth of larvae is recorded in table 34. Sixty-six mults
belonging to more than half as many individuals are tabulated. The average increase per
cent in length in stages 2 to 10 varied from 11 to 15,84. The average for stages is 13,67;
for individuals, 13,89. These facts seem to warrant the conclusion that the increase percentage
in the young is very similar to that of the adult, a result of considérable interest. The
average length of the young lobster during its first ten molts is given in the following table.
The data are taken partly from table 34:
Table 25. — Actual length of lobsters during the first ten molts.
Number of molt or stage Average length. mm. Extremes in length. mm. Number of lobsters examined.
1 7,84 7,50 to 8,03 15
2 9,20 8,3 10,2 47
3 11,1 1 10 12 79
4 12,6 11 14 64
5 14,2 13,4 15 15
6 16,1 15 17 12
7 18,6 18 19,5 4
8 21,03 19,75 22 5
9 24,5 24 25 2
10 28,03 26,6 29,5 3
The rate of growth expressed by the average of lengths in the second column of table 25
implies an increase per cent of about 15,3 instead of 13,67 (the average increase in stages recorded
in table 34). Assuming the average length of the first larva to be 7,84 (the average of 15 individuals,
table 25), and allowing the increase in length at each molttobe 15,3 per cent of the length before
molting, we would have the following series of lengths attained during the first thirty stages.
Table 26. — Estimated length of lobsters during the first thirty molts.
Stage. Length. mm. Stage. Length. mm. Stage. Length. mm.
1 7,84 11 32,55 21 135,17
2 9,04 12 37,54 22 155,86
3 10,42 13 43,28 23 179.70
4 12,02 14 49,90 24 207,20
5 13,86 15 57,53 25 238,90
6 15,98 16 66,34 26 275,45
I 18,42 17 76,49 27 317,59
8 21.24 18 88,19 28 366,16
9 24,49 19 101,68 29 422.21
10 28,23 20 117,24 30 486.81
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