OYSTER PROPAGATION IN P.E.I. 71 
SESSIONAL PAPER No. 38a 
SUMMARY OF THE DISTRIBUTION OF OYSTER FRY. 
The yield from 20 quarts dipped was one to four fry in Bideford river, one to forty 
fry in Grand river, one to three fry in Upper bay, two to five fry in March water. 
One minute’s towing yielded 2 to 166 fry in Grand river, and seven to twenty-four 
fry in March water. Vertical sampling yielded one fry in 15 to 60 feet in Bideford 
river, one to 40 feet (with majority at two to 6 feet) in Grand river, one to 24 feet 
(average at 10 feet) in Upper bay, and six to 50 feet (average 25 feet) in March 
water. Grand river leads, with March water and Upper bay struggling for second 
place. Our highest record of two fry per quart sinks into insignificance, when 
compared with the several hundreds per quart with which we have been accustomed to 
deal in our New Jersey oyster investigations. 
TABLE summarizing the sizes, in microns, of oyster larve, August 5-28. 
== 
= Aug.5| 6 10 13 14 16 ile 20 21 24 25 26 27 28 
Stages.... a hg * * * * * 70 * * Ok * * Pi - ‘ 
Bre hy) + * * + + 80} * 80/80 80} * oo 
Prans) os % = - Ge = i 90 ‘3 a a ‘2 90 90 
1 lepers See z= - = Zi ie 100) — 100 100) — ‘i 100 a 100 
110) — — = -: 110; — 110) — = 110 = 
_ — 120; — 120 120 120 x x 120 120 120 * 
MANS) .2. 2 — — — — = —- —- 140 ie — 140; — _ 140 
JIE be Seen hee 160) — — —_ 160 160 160 “y 160 160 160; — 160 160 
_— —_— _— — = 180 180 180 180 e 180; — — * 
— — 200) — 200} 200} 200} 200) 200 * 200) 200) — * 
SPrans: =... — — * — _ 220 = 220 S > “3 — 220 * 
1 ae Re — _- = 240) — 240 Ss 240 240 240 240 240 240 = 
— = 260) — — — 260 <3 * * aed ei es 260 
— — — — — 280 = DROWNS F 280} 280} 280) 280 
Trans — — — — S20 ey ta20k B20 20" -320\" 9320) S20|e S20 na20 
‘ia ES SED, PE a a EY 2 ro a ei eines | Pe ee 
— — — — 360} — 360; 360) — 4 = 360 * 360 
— — — = — 380 380; — — 380 380) — 380 380 
— — — — = 400 400; — — 400 
The preceding table of sizes must not be interpreted without a clear understand- 
ing that it represents a summary of the records, and only roughly a summary of the 
actual facts. The records, as compared with the facts, are incomplete, fragmentary, 
and approximate. They are incomplete in that a careful correlation of sizes and 
temperatures was not made, or where made, the data have not been worked into the 
table; also incomplete, because the relative proportions of fry at the diferent sizes, 
though secured in a large number of our observations, have not been incorporated. 
This because of thé misleading conclusions that would be derived from such a colla- 
tion, in the absence of temperature relations, sufficiently complete to be of scientific 
value. The records are fragmentary, in that it was impossible to secure full data 
from all the areas, and we wished to cover all the area even though it had to be done 
at the sacrifice of completeness. The sizes are approximate, in that we purposely 
used a low-power microscope and a micrometer with coarse divisions, for the sake of 
*Sizes noticed but not counted. Stages are: I., straight hinge stage, or ‘“‘small’’; II., equal umbos, 
or “‘medium’’; III. and IV., unequal umbos, or “‘large’’; V., ready to set as spat. New Jersey oyster 
larvee set in stage 1V., Canadian in Stage V. ‘‘Trans’’ means transition from one stage to next. 
