478 
BULLETIN OF THE BUREAU OF FISHERIES 
fewer spat than those in between , indicating that the peak of frequency of setting was 
probably between July 24 and 30. During the remainder of the season the rate of 
setting became gradually slower. 
Table 21. — Number of s-pat caught on hags of shells on two grounds in Oyster Bay, 1931 
June 12_ 
June 18. 
June 20- 
Jane 30. 
July 10.. 
July 15_. 
July 18.. 
July 27.. 
July 30.. 
Aug. 8- 
Aug. 11. 
Aug. 15. 
Aug. 22. 
Aug. 27. 
Sept. 8_. 
Sept. 24. 
Oct. 7... 
Date planted 
June 27. 
June 30. 
July 10.. 
July 24_. 
July 18.. 
July 24_. 
Aug. 3.. 
do.. 
Aug. 11. 
Aug. 27. 
Aug. 22. 
Aug. 29. 
Aug. 27- 
Sept. 11. 
Sept. 25. 
Oct. 7.. 
Oct. 20. . 
Date removed 
Number 
of 
days 
15 
12 
20 
24 
8 
9 
16 
7 
12 
19 
11 
14 
6 
15 
17 
13 
13 
Dike 1 
Total 
number 
of spat 
Number 
of spat 
daily 
7,286 
1, 900 
485 
158 
22, 320 
40, 520 
35, 980 
1, 395 
5,789 
2,998 
14, 277 
6, 957 
1, 298 
497 
2,691 
1,163 
150 
89 
Dike 5 
Total 
number 
of spat 
Number 
of spat 
daily 
6, 065 
404 
2, 480 
207 
697 
35 
35 
1 
0 
0 
30 
3 
28, 071 
1,754 
39, 040 
5, 577 
31, 063 
2,588 
10, 863 
67! 
16,866 
1, 533 
7. 240 
517 
1, 340 
68 
7, 769 
618 
1,474 
87 
817 
63 
10 
0.7 
Table 22. — Number of spat caught on bags of shells on 3 grounds in Oyster Bay throughout the season of 
1932 
[Counts were made on only a few of the dike 5 series for comparison] 
Date planted 
Date removed 
Number 
of days 
Dike 1 
Dike 5 
Dike S 
Total num- 
ber of spat 
Number 
of spat 
daily 
Total num- 
ber of spat 
Number 
of spat 
daily 
Total num-‘ 
ber of spat 
Number of 
spat daily 
June 27 
3 
4, 286 
1,429 
527 
178 
July 1. 
4 
21, 694 
5, 423 
3, 913 
978 
July 4 
5 
30, 083 
6, 016 
3, 463 
693 
July 1 
July 8 
7 
42' 037 
6, 005 
42, 040 
6, 006 
5, 342 
763 
July 4 
July 11 
7 
38, 156 
5, 451 
16, 263 
2, 323 
July 8 
July 15 
7 
36, 657 
5, 237 
3, 494 
499 
July 11 
July 18 
7 
19, 981 
2, 854 
19, 963 
2,852 
4,756 
679 
July 22 
7 
9, 577 
1,368 
1,888 
269 
July 18 
July 25__ 
7 
2 , 654 
379 
2, 960 
423 
'281 
54 
July 22. __ 
July 29 
7 
2,614 
373 
1,220 
174 
July 25. _ 
Aug. 1 
7 
3' 352 
479 
1,474 
210 
July 29 
Aug. 5 
7 
4 , 981 
712 
4, 043 
577 
1,986 
284 
Aug. 1 
Aug. 8 
7 
7, 146 
1,021 
4, 206 
601 
1,820 
260 
Aug. 5 
Aug. 12 
7 
13, 132 
1,876 
10, 951 
1,564 
2, 665 
381 
7 
11, 229 
1,604 
2, 214 
216 
Aug. 12 
Aug. 19 
7 
25, 618 
3, 659 
18, 420 
2, 631 
2,086 
298 
Aug. 15. 
Aug. 22 
7 
31, 406 
4, 486 
31, 694 
4, 528 
3,315 
473 
Aug. 26 
7 
31, 824 
4, 546 
6,891 
984 
Aug. 22 
Aug. 29 
7 
51,877 
7,411 
37, 023 
5,289 
4, 894 
699 
7 
15, 591 
2, 227 
1, 521 
217 
7 
6, 419 
917 
1,389 
198 
7 
10, 694 
1, 528 
333 
48 
7 
4 , 441 
' 634 
803 
115 
Sept. 16 
7 
2, 029 
289 
423 
60 
Sept. 12 
Sept. 19 
7 
80 
1, 374 
196 
843 
120 
Sept. 16 __ 
Sept. 23. __ 
7 
983 
140 
311 
44 
Sept. 19 .. 
Sept. 26 
7 
1, 468 
209 
1,802 
257 
651 
93 
Sept. 23 
7 
1, 466 
209 
655 
93 
Oct. 3 . 
7 
' 211 
30 
307 
44 
Oct. 7 
7 
534 
76 
141 
20 
Oct. 3... 
Oct. 11_ _ 
8 
471 
59 
374 
47 
Oct. 7... 
Oct. 14 __ 
7 
160 
23 
360 
61 
Oct. 11 
Oct. 17 
6 
69 
11 
Although not as complete as the results for later years, these records proved that two 
well-defined periods of setting occurred with their maxima about 6 weeks apart. The 
finding was particularly significant since the later setting was so much more profuse 
than the earlier, although the oyster growers had planted cultch only early in the 
