68 DEPARTMENT OF THE NAVAL SERVICE 
7 GEORGE V, A. 1917 
few as compared to the numbers familiar in our New Jersey studies. The mussel 
and clam larve were more numerous, and of more kinds than in Barnegat bay, N.J. 
August 6: Three samples were dipped in the “basin,” with results like those of 
yesterday. Samples taken after passing grass, between Ram and Curtain islands and 
at junction with the Central bay show few small or medium oysters, none large, many 
other bivalve larve and snails. Samples were again taken on return from Bideford and 
Grand rivers in evening, but labels were lost. 
August 7: Shipyard basin, before reaching the grass, one sample shows one large 
and one medium fry, and few small ones. After passing the grass, sample yielded five 
medium fry under 120 mu. Returning in the evening from trip to Upper bay, a sample 
taken between Ram and Bunbury islands, was nearly all snails; a sample near the 
grass had many snails, and a few oyster fry. In the Shipyard basin a sample yielded 
many small oyster fry. 
August 9: Rainy, tide high. In the channel opposite the break between Little 
and Big Curtain islands, compared vertical samples with dipping from the surface. 
The surface was 1021 at 67° F., and yielded one large and one medium, in 20 quarts, 
and a fair show of small fry. The bottom 1021 at 68° F., yielded three medium, and 
some small fry and lots of sand. Next the surface was sampled, using 20 quarts in 
alternation with vertical ‘hauling ” in the three uppermost feet, nine samples. Thirty 
feet of vertical sampling nearly balanced 20 quarts of surface dipping. No fry larger 
than 120 mu were found, and never more than one or two; small fry were present in 
small numbers. 
August 10: Compared. dipping with vertical sampling from bottom to top. In 
20 feet of water between Bunbury and Ram, and Prince to Beech points, hauled net, 
and dipped 30 quarts from surface, 14 samples. Obtained two fry of 200 and 260 mu, 
three to six medium, and several small ones. Found four species of three genera of 
Peridinide, viz., Ceratium tripos, C. divergens, Dinophysis acuta, and Peridinia sp? 
Also many Tintinnus subulatus. 
August 11: High water, and strong northeast wind. An oyster secured by dredg- 
ing in channel is filled with immature spawn. Water 1021 at 66° F. Shells obtained 
by dredging hold no spat except “ deckers” and barnacles. Samples of 30 quarts yield 
each two large fry and two medium ones. Vertical sampling.secured one large fry per 
20 feet; also some medium. 
August 12, a sample dipped near-Bunbury yielded one medium, and two smaller 
fry. Oysters from Ram Island point are nearly through spawning. Hung out shell 
cultch on buoy nearest wharf, and sampled water here, finding one large and two 
medium fry in 20 quarts. 
August 14, in channel between Ram island and Little Curtain island, water is 
1019-5 at 68° F., vertical sample gives one fry per 14 feet, the largest being 200 mu, 
but most are 120 mu. In Shipyard basin, at the buoy farthest from wharf, water is 
1019-5 at 70° F., and vertical sampling yields one fry per 12 feet; one is 860 mu, or 
nearly ready to set, one is 200 mu, seven are ‘120 mu. At buoy nearest wharf, vertical 
sample gives one per 30 feet, with largest larva 160 mu. 
August 16, rainy. Made a survey of March Water section, at same time compared 
methods of taking fry. Used vertical sampler for surface towing, as well as for deep 
sampling. Between Ram and Bunbury, secured fry of sizes 80, 100, 160, 200, 280 mu. 
In line of Beech point and Ram island, vertical sampling yielded one per 30 feet of 
sizes 80, 120,160 mu. In line of Beech point and Prince point, vertical sampling gave 
one per 20 feet of sizes 160, 240, 340 mu. Towing towards Princetown beds yielded 
fry up to 180 mu. On Princetown beds, vertical sampling yielded one per 15 feet, of 
sizes 110 to 120 mu, 160, 240, 320, and 400 mu, which last is the largest seen, and also 
represents the largest after “‘setting.” A second sample towards Grog island gave 
similar results, both in ratios and sizes. A towing sample yielded: six large fry per 
minute, the leading groups being at 160, 240, and 340 mu. Small fry being quite dif- 
ficult to separate from small larve of other bivalves, were generally not counted fully. 
