482 
BULLETIN OF THE BUREAU OF FISHERIES 
sisted of two minor maxima. In each instance the two submaxima are approximately 
2 weeks apart, while the two peaks of the second period are about 6 weeks later than 
those of the first period. While in some seasons the second setting period is the greater, 
as in 1931, during 1934 the first was by far the more important. In 1932, however, 
the two were roughly equal. The results obtained in dike S are similar, but the sub- 
maxima do not show so clearly, possibly because the number of spat was too small to 
indicate such details. At the middle of July there was a period of about 2 weeks during 
which only an occasional larva attached. The figure shows that between July 9 and 
July 23 the number of spat caught was insignificant. A similar cessation of setting 
was also noted in 1931 for an even longer time in between the two major divisions of 
the setting season. As will be discussed later, this does not appear to be directly 
correlated with a similar variation in the frequency of spawning. 
Table 25 . — Number of spat caught on bags of shells of 2 grounds in Oyster Bay during the season of 1984 
Date planted 
May 28. 
June 1-. 
June 4. - 
June 8-- 
June 11- 
June 15- 
June 18. 
June 22. 
June 25- 
June 29 _ 
July 2— 
July 6 --. 
July 9... 
July 13.. 
July 16- 
July 20.. 
Julv 23- 
July 27- 
July 30- 
Aug. 3_. 
Aug. 6.. 
Aug. 10. 
Aug. 13. 
Aug. 17. 
Aug. 20. 
Aug. 24. 
Aug. 27. 
Aug. 31. 
Sept. 3- 
Sept. 7._ 
Sept. 10- 
Sept. 14- 
Sept. 17. 
Sept. 21. 
Date removed 
Number of 
days 
Dike 5 
Dike S 
Total 
number 
of spat 
Number 
of spat 
daily 
Total 
number 
of spat 
Number 
of spat 
daily 
June 4 
1 7(1) 
218 
218 
( 2 ) 
June 8 
1 7(5) 
2, 267 
453 
(2) 
June 11. - 
7 
3| 569 
610 
549 
78 
June 15. . 
7 
47, 229 
6, 761 
3, 430 
490 
June 18 
7 
44, 825 
6, 403 
8, 510 
1, 216 
June 22. 
7 
39, 053 
5, 579 
8, 610 
1, 230 
June 25 
7 
34, 051 
4, 864 
10, 487 
1,498 
June 29 
7 
48, 309 
6. 901 
8, 000 
1, 143 
July 2 
7 
48, 600 
6, 943 
6, 855 
979 
July 6.. 
7 
28, 671 
4,096 
5, 407 
772 
July 9- 
7 
16, 448 
2, 349 
4, 307 
615 
July 13. - 
7 
4, 386 
626 
936 
133 
July 10. 
7 
398 
57 
79 
11 
July 20 ___ 
7 
65 
8 
(2) 
July 23 
7 
100 
14 
( 2 ) 
July 27 
'7(4) 
2, 132 
533 
160 
40 
July 30 
7 
6, 193 
885 
892 
127 
Aug. 3 
7 
20, 785 
2, 969 
2, 204 
315 
Aug. 6 
7 
13, 728 
1,961 
1, 360 
194 
Aug. 10 .. 
7 
14, 694 
2,099 
2, 453 
350 
Aug. 13 
7 
24, 823 
3, 546 
1, 737 
248 
Aug. 17 - 
7 
8, 200 
1, 171 
526 
75 
Aug. 20. 
7 
6, 634 
948 
377 
54 
Aug. 24 
7 
2, 731 
390 
503 
72 
Aug. 27 
7 
1,047 
149 
417 
59 
Aug. 31 
7 
3, 528 
504 
31 
4 
Sept. 3. 
7 
2, 497 
357 
192 
27 
Sept. 7 — _ 
7 
1,480 
211 
69 
10 
Sept. 10-. - 
7 
1, 303 
186 
130 
18 
Sept. 14. 
7 
1,471 
210 
178 
25 
Sept. 17 
7 
1, 403 
200 
351 
50 
Sept. 21_ 
7 
123 
17 
34 
5 
Sept. 24 
7 
257 
37 
34 
5 
Sept. 28 
7 
62 
9 
1 Bags in water for 7 days, but setting started some time after they were planted. 
2 Only occasional spat; too few to warrant counting. 
Table 26 . — Number of spat caught on bags of shells in dike 5 in Oyster Bay during the season of 1935 
Date 
planted 
Date re- 
moved 
Number of 
days 
Total number 
of spat 
Number of 
spat daily 
Date 
planted 
Date re- 
moved 
Number of 
days 
Total number 
of spat 
Number of 
spat daily 
June 14 
June 
21 
1 7(3) 
7, 991 
2,664 
Aug. 9 
Aug. 16 
7 
22, 751 
3,250 
June 17 
June 
24 
'7(6) 
20, 451 
3, 408 
Aug. 12 
Aug. 19 
7 
52, 810 
7, 544 
June 21 
June 
28 
7 
48, 848 
6, 979 
Aug. 16 
Aug. 23 
7 
62, 110 
8, 872 
June 24 
July 
1 
7 
86, 034 
12, 291 
Aug. 19 
Aug. 26 
7 
33, 628 
4, 808 
June 28 
July 
5 
7 
25,114 
3, 587 
Aug. 23 
Aug. 30 
7 
19, 008 
2,715 
July 1 
July 
8 
7 
44,311 
6, 330 
Aug. 26 
Sept. 2 
7 
18, 672 
2,667 
July 5 
July 
12 
7 
17, 890 
2,555 
Aug. 30 
Sept. 6 
7 
15, 800 
2, 257 
July 8 
July 
15 
7 
9, 506 
1, 358 
Sept. 2 
Sept. 9 
7 
5, 942 
848 
July 12 
July 
19 
7 
16, 505 
2, 357 
Sept. 6 
Sept. 14 
8 
694 
87 
July 15 
July 
22 
7 
27, 751 
3, 964 
Sept. 9 
Sept. 16 
7 
171 
24 
July 19 
July 
26 
7 
28, 097 
4,013 
Sept. 14 
Sept. 20 
6 
380 
76 
July 22 
July 
29 
7 
16, 157 
2, 308 
Sept. 16 
Sept. 27 
11 
514 
46 
July 26 
Aug. 
2 
7 
3, 791 
540 
Sept. 20 
-__do 
7 
122 
17 
J ulv 29 
Aug. 
5 
7 
274 
39 
Sept. 27 
Oct. 5 
8 
108 
13 
Aug. 2 
Aug. 
9 
7 
817 
116 
Oct. 5 
Oct. 12 
7 
211 
30 
Aug. 5 
Aug. 
12 
7 
2,394 
342 
1 Bags in water for 7 days, but setting started some time after they were planted. 
