NATURAL HISTORY OF THE BAY SCALLOP 
607 
large scallops of a compact size group. As the season progresses the effect of growth 
becomes very evident in the first class and, in time, the effect of market scalloping 
in the second class. By the end of the scalloping season, except for a few stray old 
scallops, there is present only one class. This class, because of the extended and 
probably irregular spawning season, for a time is lacking in compactness and may 
even appear divided, but by June or July becomes compact and so continues until 
Lengt K 
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in. 0 ’ 10 ' 20 ‘ 30 ' 40 r SO r 60 ’ 70 r 80 ' ' 90 ‘ WO, r I/O 
Figure 25. — Scallop length-frequency curves (5-inillimeter groupings) 
for various years at various seasons. To save space and facilitate 
comparison, if large numbers of small scallops were found this part 
of the curve has been omitted. (See Table 5) 
all but eliminated by scallopers. Through the few left it may be followed (1927) 
into the next fall. In 1927, the first year in which suitable methods for securing 
very small scallops were applied throughout the year, the new class appeared in the 
summer. This class became prominent in late summer and through the fall and 
early winter increased greatly. Figure 25 shows the size frequency distribution at 
different seasons in different years. 
